The Zoochat Photographic Guide to Rodents: part two

In Wisconsin is the nominate zibethicus.

 

Neotominae (North American rats and mice)

About 125 species in sixteen genera: Baiomys, Habromys, Hodomys, Isthmomys, Megadontomys, Nelsonia, Neotoma, Neotomodon, Ochrotomys, Onychomys, Osgoodomys, Peromyscus, Podomys, Reithrodontomys, Scotinomys, Xenomys

Only ten species are represented in the Zoochat galleries, from four genera (Baiomys, Neotoma, Peromyscus and Reithrodontomys).


There are three subfamilies of exclusively New World rodents in Cricetidae: Neotominae (c.125 spp), Tylominae (11 spp), and Sigmodontinae (c.375 spp). There is some dispute about how best to arrange these three groups. Some authors would combine them all under one subfamily (Sigmodontinae); others split them into three subfamilies. I have followed the latter course and split them in three.


The subfamily Neotominae is divided into four Tribes:


Baiomyini (American pigmy mice and singing mice)
Four species in two genera: Baiomys, Scotinomys

One species is depicted here, from the genus Baiomys.


Neotomini (woodrats and pack rats)
About 24 species in four genera: Hodomys, Nelsonia, Neotoma, Xenomys

Two species are depicted here, from the genus Neotoma.


Ochrotomyini (Golden Mouse)
One species, in the genus Ochrotomys

The single species is not depicted here.


Reithrodontomyini (deer mice and American harvest mice)
About 95 species in nine genera: Habromys, Isthmomys, Megadontomys, Neotomodon, Onychomys, Osgoodomys, Peromyscus, Podomys, Reithrodontomys

Seven species are depicted here, from the genera Peromyscus and Reithrodontomys.


In the following posts the genera will be presented as per the above (alphabetically within individual Tribes).

 

Baiomyini (American pigmy mice and singing mice) is the first Tribe from Neotominae. It contains four species in two genera: Baiomys, Scotinomys.


One of the species is represented in the Zoochat galleries.


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Baiomys
Two species


Northern Pigmy Mouse Baiomys taylori
Eight subspecies: allex, analogus, ater, canutus, fuliginatus, paulus, subater, taylori

Photo by @d1am0ndback in the wild, USA (subspecies taylori)


Northern Pygmy Mouse- Baiomys taylori - ZooChat


The second species, which is not represented in the Zoochat galleries, is the Southern Pigmy Mouse Baiomys musculus


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Scotinomys
Two species


Alston's or Short-tailed Singing Mouse Scotinomys teguina
Chiriqui Brown Mouse or Long-tailed Singing Mouse Scotinomys xerampelinus

 

Neotomini (woodrats and pack rats) is the second Tribe from Neotominae. It contains about 24 species in four genera: Hodomys, Nelsonia, Neotoma, Xenomys.


Two species are represented in the Zoochat galleries, both from the genus Neotoma.


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Hodomys
One species


Allen's Woodrat Hodomys alleni


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Nelsonia
Two species


Goldman's Woodrat Nelsonia goldmani
Diminutive Woodrat Nelsonia neotomodon


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Neotoma
About twenty species, of which two are represented in the Zoochat galleries.


White-throated Woodrat Neotoma albigula
Seven subspecies: albigula, brevicauda, laplataensis, mearnsi, seri, sheldoni, venusta. The subspecies melanura from northwest Mexico was split as a cryptic species in 2015. Until 2001 the White-toothed Woodrat Neotoma leucodon was lumped into N. albigula hence the numbers of subspecies often quoted for the latter species (up to 15).

Photo by @Giant Eland at Wildlife World Zoo and Aquarium (USA) (unknown subspecies)


white-throated woodrat (Neotoma albigula) 2010 - ZooChat


Photo by @Arizona Docent in the wild, USA (subspecies albigula - the type specimen was collected near Tucson, which is the area where this photo was taken)


white throated woodrat (pack rat) - ZooChat


Dusky-footed Woodrat Neotoma fuscipes
Seven subspecies: annectens, bullatior, fuscipes, monochroura, riparia, perplexa, streatori. Until 2002 the Big-eared Woodrat Neotoma macrotis was lumped into N. fuscipes hence the numbers of subspecies often quoted for the latter species (up to 11).

Photo by @UngulateNerd92 at Pacific Grove Museum of Natural History (USA) (taxidermy specimen of unknown specimen)


Dusky footed woodrat (Neotoma fuscipes) - ZooChat


The remaining species in the genus Netoma are below:

Tamaulipan Woodrat Neotoma angustapalata
Bryant's Woodrat Neotoma bryanti
Nicaraguan Woodrat Neotoma chrysomelas
Pack Rat or Bushy-tailed Woodrat Neotoma cinerea
Arizona Woodrat Neotoma devia
Eastern Woodrat Neotoma floridana
Goldman's Woodrat Neotoma goldmani
Desert Woodrat Neotoma lepida
White-toothed Woodrat Neotoma leucodon
Big-eared Woodrat Neotoma macrotis
Allegheny Woodrat Neotoma magister
Black-tailed Woodrat Neotoma melanura (split from N. albigula in 2015)
Mexican Woodrat Neotoma mexicana
Southern Plains Woodrat Neotoma micropus
Nelson's Woodrat Neotoma nelsoni
Bolanos Woodrat Neotoma palatina
Sonoran Woodrat Neotoma phenax
Stephens' Woodrat Neotoma stephensi


The following three taxa are now extinct. They were all endemic to small islands off Baja California and are thought to have been wiped out by introduced cats. They may be treated as full species or (as the IUCN does) as subspecies of the extant Neotoma bryanti:

Anthony's Woodrat Neotoma anthonyi (from the Todos Los Santos islands; last seen in 1926).

Bunker's Woodrat Neotoma bunkeri (known only from a series of specimens collected in 1931 from the Coronados Islands).

San Martin Island Woodrat Neotoma martinensis (from San Martin Island; last seen in the 1950s).


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Xenomys
One species


Magdalena Rat Xenomys nelsoni

 

Ochrotomyini (Golden Mouse) is the third Tribe from Neotominae. It contains just a single species, which is not represented in the Zoochat galleries.


Golden Mouse Ochrotomys nuttalli

 

Reithrodontomyini (deer mice and American harvest mice) is the fourth and final Tribe from Neotominae. It contains about 95 species in nine genera: Habromys, Isthmomys, Megadontomys, Neotomodon, Onychomys, Osgoodomys, Peromyscus, Podomys, Reithrodontomys.


Seven species are represented in the Zoochat galleries, from the genera Peromyscus and Reithrodontomys.

 

Habromys
Seven species, none of which are represented in the Zoochat galleries.


Chinanteco Deer Mouse Habromys chinanteco
Delicate Deer Mouse Habromys delicatulus
Ixtlán Deer Mouse Habromys ixtlani
Zempoaltepec Deer Mouse Habromys lepturus
Crested-tailed Deer Mouse Habromys lophurus
Cloud Forest Deer Mouse Habromys schmidlyi
Jico Deer Mouse Habromys simulatus


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Isthmomys
Two species, neither of which are represented in the Zoochat galleries.


Yellow Isthmus Rat Isthmomys flavidus
Mount Pirri Isthmus Rat Isthmomys pirrensis


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Megadontomys
Three species, none of which are represented in the Zoochat galleries.


Oaxaca Giant Deer Mouse Megadontomys cryophilus
Nelson's Giant Deer Mouse Megadontomys nelsoni
Thomas's Giant Deer Mouse Megadontomys thomasi


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Neotomodon
One species, not represented in the Zoochat galleries.


Mexican Volcano Mouse Neotomodon alstoni


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Onychomys
Three species, none of which are represented in the Zoochat galleries.


Chihuahuan Grasshopper Mouse Onychomys arenicola
Northern Grasshopper Mouse Onychomys leucogaster
Southern Grasshopper Mouse Onychomys torridus


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Osgoodomys
One species, not represented in the Zoochat galleries.


Michoacan Deer Mouse Osgoodomys banderanus

 

Peromyscus
About 55-60 species, of which six are represented in the Zoochat galleries.


California Mouse Peromyscus californicus
Five subspecies: benitoensis, californicus, insignis, mariposae, parasiticus

Both photos by @ThylacineAlive at the Bronx Zoo (USA)


California Mouse - ZooChat



California Mouse - ZooChat


Cactus Mouse Peromyscus eremicus
At least 15 subspecies have been used for P. eremicus but in 2000 the Northern Baja Deer Mouse Peromyscus fraterculus was split off as a full species which complicated matters. Mammals of Mexico lists nine subspecies for P. eremicus and six for P. fraterculus, although they were only considering those which are found in Mexico (both species also occur in the southern USA).

Photo by @Kakapo at Burgers' Zoo (Netherlands)


Cactus mice (Peromyscus eremicus) - ZooChat


White-footed Mouse Peromyscus leucopus
About 17 subspecies: affinis, ammodytes, aridulus, arizonae, castaneus, caudatus, cozumelae, easti, fuscus, incensus, lachiguiriensis, leucopus, mesomelas, novaeboracensis, ochraceus, texensis, tomillo

Photo by @Giant Eland at Fort Wayne Children's Zoo (USA)


2013: Fort Wayne Children's Zoo - ZooChat


North American Deer Mouse Peromyscus maniculatus
Almost 70 subspecies have been named, and it is known that some occur sympatrically without interbreeding or have distinct habitat preferences; it is almost certainly a species complex.

A 2019 paper [https://www.researchgate.net/public...S_OF_THE_PEROMYSCUS_MANICULATUS_SPECIES_GROUP] made some headway to making genetic sense of the complex, dividing "Peromyscus maniculatus" into six species, with P. maniculatus covering most of the eastern side of North America and P. sonoriensis most of central and western North America, with additional species P. arcticus and P. keeni in the northwest, P. gambelii in the southwest USA and Baja California, and P. labecula in extreme south USA and most of Mexico.

Under this division of species, the Wisconsin animals depicted below would be the true P. maniculatus; while the Arizona animal may be either P. sonoriensis or P. labecula (the ranges probably meet or overlap), or even the Black-eared Deer Mouse P. melanotis which is morphologically almost identical and also occurs in this area.


Photo by @birdsandbats of wild-caught animals, Wisconsin (USA)


North American Deer Mice (Peromyscus maniculatus) - ZooChat


Photo by @Giant Eland of a wild animal, Arizona (USA)


deer mouse (Peromyscus maniculatus) - ZooChat


Photo by @Ituri in the wild, Idaho (USA) (P. sonoriensis if split)


Western Deer Mouse (Peromyscus sonoriensis) - ZooChat


Naked-footed Deer Mouse Peromyscus nudipes
Monotypic. Formerly has been included in P. mexicanus.

Photo by @Najade in the wild, Costa Rica


https://www.zoochat.com/community/media/naked-footed-deer-mouse-peromyscus-nudipes.687056/


Oldfield or Beach Mouse Peromyscus polionotus
About fifteen to twenty subspecies. Inland subspecies are known as Oldfield Mice (albifrons, colemani, griseobracatus, lucubrans, polionotus, rhoadsi, subgriseus, sumneri). Eight coastal subspecies are known as Beach Mice (allophrys, ammobates, decoloratus [now extinct], leucocephalus, niveiventris, peninsularis, phasma, trissyllepsis).

Photo by @ThylacineAlive at Noah's Ark Farm Park (UK) (Alabama subspecies ammobates)


Alabama Beach Mouse - ZooChat


Photo by @Giant Eland at Palm Beach Zoo (USA) (Perdido Key subspecies trissyllepsis)


Perdido Key beach mouse (Peromyscus polionotus trissyllepsis) - ZooChat

 

Because there are so many species in the genus Peromyscus and because the taxonomy of them is complicated, I have placed them below in their taxonomic clusters rather than just as a basic alphabetical list. Definitely do not take these groupings as definite because the taxonomy is disputed and will certainly change. I have left the species illustrated in the previous post in the list so that their relationships can be seen.


1. californicus group
California Mouse Peromyscus californicus [depicted in the previous post]

2. eremicus group
Burt's Deer Mouse Peromyscus caniceps
Dickey's Deer Mouse Peromyscus dickeyi
Cactus Mouse Peromyscus eremicus [depicted in the previous post]
Eva's Desert Mouse Peromyscus eva
Northern Baja Deer Mouse Peromyscus fraterculus
Angel Island Mouse Peromyscus guardia (endemic to a few islands off Baja California; not recorded since 1991 and probably extinct due to introduced cats)
San Lorenzo Mouse Peromyscus interparietalis
Mesquite Mouse Peromyscus merriami
Pemberton's Deer Mouse Peromyscus pembertoni (endemic to the island of San Pedro Nolasco off Baja California; known only from a series of specimens collected in 1931 and considered to now be extinct due to introduced cats)
False Canyon Mouse Peromyscus pseudocrinitus

3. hooperi group
Hooper's Mouse Peromyscus hooperi

4. crinitus group
Canyon Mouse Peromyscus crinitus

5. maniculatus group
Northwestern Deer Mouse Peromyscus keeni
North American Deer Mouse Peromyscus maniculatus [depicted in the previous post, and see the note there about additional split species (arcticus, gambelii, labecula and sonoriensis)]
Black-eared Mouse Peromyscus melanotis
Oldfield or Beach Mouse Peromyscus polionotus [depicted in the previous post]
Santa Cruz Mouse Peromyscus sejugis
Slevin's Mouse Peromyscus slevini (not included in this group by all authors)

6. leucopus group
Cotton Mouse Peromyscus gossypinus
White-footed Mouse Peromyscus leucopus [depicted in the previous post]

7. aztecus group
Aztec Mouse Peromyscus aztecus
Gleaning Mouse Peromyscus spicilegus
Winkelmann's Mouse Peromyscus winkelmanni

8. boylii group
Texas Mouse Peromyscus attwateri
Orizaba Deer Mouse Peromyscus beatae
Brush Mouse Peromyscus boylii
Nimble-footed Mouse Peromyscus levipes
Tres Marias Island Mouse Peromyscus madrensis
White-ankled Mouse Peromyscus pectoralis
Chihuahuan Mouse Peromyscus polius
Schmidly's Deer Mouse Peromyscus schmidlyi
Nayarit Mouse Peromyscus simulus
San Esteban Island Mouse Peromyscus stephani

9. truei group
Perote Mouse Peromyscus bullatus
Zacatecan Deer Mouse Peromyscus difficilis
Osgood's Mouse Peromyscus gratus
Northern Rock Mouse Peromyscus nasutus
Pinyon Mouse Peromyscus truei

10. melanophrys group
Puebla Deer Mouse Peromyscus mekisturus
Plateau Mouse Peromyscus melanophrys
Tawny Deer Mouse Peromyscus perfulvus

11. furvus group
Blackish Deer Mouse Peromyscus furvus
Mayan Deer Mouse Peromyscus mayensis
El Carrizo Deer Mouse Peromyscus ochraventer

12. megalops group
Brown Deer Mouse Peromyscus megalops
Black-footed Deer Mouse Peromyscus melanocarpus
Black-tailed Deer Mouse Peromyscus melanurus

13. mexicanus group
Big Deer Mouse Peromyscus grandis
Guatemalan Deer Mouse Peromyscus guatemalensis
Naked-eared Deer Mouse Peromyscus gymnotis
Transvolcanic Deer Mouse Peromyscus hylocetes
Mexican Deer Mouse Peromyscus mexicanus
Naked-footed Deer Mouse Peromyscus nudipes [depicted in the previous post]
Stirton's Deer Mouse Peromyscus stirtoni
Yucatan Deer Mouse Peromyscus yucatanicus
Chiapas Deer Mouse Peromyscus zarhynchus

 

Podomys
One species, not represented in the Zoochat galleries.

Florida Mouse Podomys floridanus


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Reithrodontomys
About 22 species, one of which is represented in the Zoochat galleries.


Western Harvest Mouse Reithrodontomys megalotis
Between 15 and 20 subspecies have been described, although most are probably invalid (synonyms), and there may also be cryptic species amongst them.

Photo by @Coelacanth18 in the wild, USA (subspecies arizonensis if retained as a valid subspecies, otherwise treated as a synonym of R. m. megalotis)


Western Harvest Mouse (Reithrodontomys megalotis) - ZooChat


The remaining species in the genus Reithrodontomys are below:


Guerrero Harvest Mouse Reithrodontomys bakeri
Short-nosed Harvest Mouse Reithrodontomys brevirostris
Sonoran Harvest Mouse Reithrodontomys burti
Volcano Harvest Mouse Reithrodontomys chrysopsis
Chiriqui Harvest Mouse Reithrodontomys creper
Darien Harvest Mouse Reithrodontomys darienensis
Fulvous Harvest Mouse Reithrodontomys fulvescens
Slender Harvest Mouse Reithrodontomys gracilis
Hairy Harvest Mouse Reithrodontomys hirsutus
Eastern Harvest Mouse Reithrodontomys humulis
Mexican Harvest Mouse Reithrodontomys mexicanus
Small-toothed Harvest Mouse Reithrodontomys microdon
Plains Harvest Mouse Reithrodontomys montanus
Musser's Harvest Mouse Reithrodontomys musseri
Nicaraguan Harvest Mouse Reithrodontomys paradoxus
Salt Marsh Harvest Mouse Reithrodontomys raviventris
Rodriguez's Harvest Mouse Reithrodontomys rodriguezi
Cozumel Harvest Mouse Reithrodontomys spectabilis
Sumichrast's Harvest Mouse Reithrodontomys sumichrasti
Narrow-nosed Harvest Mouse Reithrodontomys tenuirostris
Zacatecas Harvest Mouse Reithrodontomys zacatecae

 

Tylomyinae (New World climbing rats)

Eleven species in four genera: Nyctomys, Otonyctomys, Ototylomys, Tylomys.

Three species from three genera are represented in the Zoochat galleries. The missing genus is Otonyctomys.


There are three subfamilies of exclusively New World rodents in Cricetidae: Neotominae (c.125 spp), Tylominae (11 spp), and Sigmodontinae (c.375 spp). There is some dispute about how best to arrange these three groups. Some authors would combine them all under one subfamily (Sigmodontinae); others split them into three subfamilies. I have followed the latter course and split them in three.


The subfamily Tylominae is divided into two Tribes: Nyctomyini with two species in two genera (Nyctomys and Otonyctomys); and Tylomyini with nine species in two genera (Ototylomys and Tylomys).


Because there are so few species I will combine all of them under one post.


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Nyctomys
One species


Sumichrast's Vesper Rat Nyctomys sumichrasti
Nine subspecies: colimensis, costaricensis, decolorus, florencei, nitellinus, pallidulus, salvini, sumichrasti, venustulus

Photo by @Najade in the wild, Costa Rica (subspecies venustulus at this photo's location I think)


https://www.zoochat.com/community/media/vesper-rat-nyctomys-sumichrasti.687060/


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Otonyctomys
One species


Hatt's Vesper Rat Otonyctomys hatti


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Ototylomys
Two species


Big-eared Climbing Rat Ototylomys phyllotis
Three subspecies: australis, connectens and phyllotis

Photo by @Najade in the wild, Costa Rica (subspecies australis)


https://www.zoochat.com/community/media/big-eared-climbing-rat-ototylomys-phyllotis.687104/


La Pera Big-eared Climbing Rat Ototylomys chiapensis (described in 2017)


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Tylomys
Seven species


Watson's Climbing Rat Tylomys watsoni
Monotypic

Photo by @Najade in the wild, Costa Rica


https://www.zoochat.com/community/media/watsons-climbing-rat-tylomys-watsoni.687157/



Chiapas Climbing Rat Tylomys bullaris
Fulvous-bellied Climbing Rat Tylomys fulviventer
Mira Climbing Rat Tylomys mirae
Peters's Climbing Rat Tylomys nudicaudus
Panamanian Climbing Rat Tylomys panamensis
Tumbala Climbing Rat Tylomys tumbalensis

 

Sigmodontinae (New World rats and mice)

About 400 species in about 83 extant genera (I have also included some historically-extinct genera here): Abrawayaomys, Abrothrix, Aegialomys, Aepeomys, Akodon, Amphinectomys, Andalgalomys, Andinomys, Anotomys, Auliscomys, Bibimys, Blarinomys, Brucepattersonius, Calomys, Cerradomys, Chelemys, Chibchanomys, Chilomys, Chinchillula, Delomys, Deltamys, Drymoreomys, Eligmodontia, Eremoryzomys, Euneomys, Euryoryzomys, Galenomys, Geoxus, Graomys, Handleyomys, Holochilus, Hylaeamys, Ichthyomys, Irenomys, Juliomys, Juscelinomys, Kunsia, Lenoxus, Loxodontomys, Lundomys, Megalomys [extinct], Megaoryzomys [extinct], Melanomys, Microakodontomys, Microryzomys, Mindomys, Neacomys, Necromys, Nectomys, Neomicroxus, Neotomys, Nephelomys, Nesoryzomys, Neusticomys, Noronhomys [extinct], Notiomys, Oecomys, Oligoryzomys, Oreoryzomys, Oryzomys, Oxymycterus, Pattonimus, Phaenomys, Phyllotis, Podoxymys, Pseudoryzomys, Punomys, Reithrodon, Rhagomys, Rheomys, Rhipidomys, Salinomys, Scapteromys, Scolomys, Sigmodon, Sigmodontomys, Sooretamys, Tanyuromys, Tapecomys, Thalpomys, Thaptomys, Thomasomys, Transandinomys, Wiedomys, Wilfredomys, Zygodontomys.


Only thirteen species are represented in the Zoochat galleries, from ten genera: Abrothrix, Akodon, Andalgalomys, Auliscomys, Graomys, Irenomys, Oligoryzomys, Reithrodon, Sigmodon and Sooretamys.



There are three subfamilies of exclusively New World rodents in Cricetidae: Neotominae (c.125 spp), Tylominae (11 spp), and Sigmodontinae (c.400 spp). There is some dispute about how best to arrange these three groups. Some authors would combine them all under this subfamily (Sigmodontinae); others split them into three subfamilies. I have followed the latter course and split them in three.



The subfamily Sigmodontinae is divided into eight Tribes as below. There is also the genus Juliomys with four species, which nobody knows where to place.


Sigmodontini (cotton rats)
About 14 species in the single genus Sigmodon

Three of the species are depicted here.


Ichthyomyini (fish-eating rats and water mice)
About 17 species in five genera: Anotomys, Chibchanomys, Ichthyomys, Neusticomys, Rheomys

None of the species are depicted here.


Oryzomyini (rice rats)
About 125 species in 30 extant genera: Aegialomys, Amphinectomys, Cerradomys, Drymoreomys, Eremoryzomys, Euryoryzomys, Handleyomys, Holochilus, Hylaeamys, Lundomys, Megalomys [extinct], Megaoryzomys [extinct], Melanomys, Microakodontomys, Microryzomys, Mindomys, Neacomys, Nectomys, Nephelomys, Nesoryzomys, Noronhomys [extinct], Oecomys, Oligoryzomys, Oreoryzomys, Oryzomys, Pattonimus, Pseudoryzomys, Scolomys, Sigmodontomys, Sooretamys, Tanyuromys, Transandinomys, Zygodontomys

Three species are depicted here, from the genera Oligoryzomys and Sooretamys.


Thomasomyini (South American mice)
About 70 species in nine genera: Abrawayaomys, Aepeomys, Chilomys, Delomys, Phaenomys, Rhagomys, Rhipidomys, Thomasomys, Wilfredomys

None of the species are depicted here.


Wiedomyini (red-nosed mice)
Two species in the single genus Wiedomys

None of the species are depicted here.


Abrotrichini (long-clawed mice)
About 14 species in four genera: Abrothrix, Chelemys, Geoxus, Notiomys

One species is depicted here, from the genus Abrothrix.


Akodontini (South American grass mice)
About 90 species in 15 genera: Akodon, Neomicroxus, Bibimys, Blarinomys, Brucepattersonius, Deltamys, Juscelinomys, Kunsia, Lenoxus, Necromys, Oxymycterus, Podoxymys, Scapteromys, Thalpomys, Thaptomys

One species is depicted here, from the genus Akodon.


Phyllotini (leaf-eared mice)
About 65 species in 17 genera: Andalgalomys, Andinomys, Auliscomys, Calomys, Chinchillula, Eligmodontia, Euneomys, Galenomys, Graomys, Irenomys, Loxodontomys, Neotomys, Phyllotis, Punomys, Reithrodon, Salinomys, Tapecomys

Five species are depicted here, from the genera Andalgalomys, Auliscomys, Graomys, Irenomys and Reithrodon.


In the following posts the genera will be presented as per the above (alphabetically within individual Tribes).

 

Juliomys
Four species, none of which are represented in the Zoochat galleries.


Nobody knows how to classify this genus so it is generally left out of the Tribes as incertae sedis.


Delicate Tree Mouse Juliomys ossitenuis
Lesser Wilfred's or Small Red-nosed Tree Mouse Juliomys pictipes
Cleft-headed or Montane Red-rumped Tree Mouse Juliomys rimofrons
Aracuaria Tree Mouse Juliomys ximenezi (described in 2016)

 

Sigmodontini (cotton rats) is the first Tribe from Sigmodontinae. It contains about fourteen species in the single genus Sigmodon.


Three of the species are represented in the Zoochat galleries.


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Sigmodon
Fourteen species, three of which are represented in the Zoochat galleries.


Arizona Cotton Rat Sigmodon arizonae
Five subspecies, two of which are now extinct: cienegae, major and plenus are still extant; S. a. arizonae was last recorded in 1932, while S. a. jacksoni is apparently known only from the type specimen from 1918.

Photo by @Ituri in the wild, Arizona (USA) (subspecies cienegae)


Arizona Cotton Rat - ZooChat


Hispid Cotton Rat Sigmodon hispidus
There are 25 described subspecies.

Photo by @Maguari at Burgers' Zoo (Netherlands)


Hispid Cotton Rat at Burgers Zoo Arnhem, 30/05/12 - ZooChat


Yellow-nosed Cotton Rat Sigmodon ochrognathus
Monotypic. Four subspecies were originally described (baileyi, madrensis, montanus, ochroganthus) based on size and colouration but since at least the 1960s these have been shown to be inconsistent, and more recently the genetics do not support multiple subspecies either.

Photo by @Giant Eland in the wild, Arizona (USA)


yellow-nosed cotton rat (Sigmodon ochrognathus) - ZooChat



The remaining species in the genus Sigmodon are below:

Allen's Cotton Rat Sigmodon alleni
Alston's Cotton Rat Sigmodon alstoni
Southern Cotton Rat Sigmodon hirsutus
Jaliscan Cotton Rat Sigmodon mascotensis
Miahuatlán Cotton Rat Sigmodon planifrons
Toltec Cotton Rat Sigmodon toltecus
Montane Cotton Rat Sigmodon zanjonensis
Tawny-bellied Cotton Rat Sigmodon fulviventer
Unexpected Cotton Rat Sigmodon inopinatus
White-eared Cotton Rat Sigmodon leucotis
Peruvian Cotton Rat Sigmodon peruanus

 

Ichthyomyini (fish-eating rats and water mice) is the second Tribe from Sigmodontinae. It contains about 17 species in five genera: Anotomys, Chibchanomys, Ichthyomys, Neusticomys, Rheomys.


None of the species are depicted here.


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Anotomys
One species


Aquatic Rat Anotomys leander


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Chibchanomys
Two species


Las Cajas Water Mouse Chibchanomys orcesi
Chibchan Water Mouse Chibchanomys trichotis


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Ichthyomys
Four species


Crab-eating Rat Ichthyomys hydrobates
Pittier's Crab-eating Rat Ichthyomys pittieri
Stolzmann's Crab-eating Rat Ichthyomys stolzmanni
Tweedy's Crab-eating Rat Ichthyomys tweedii


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Neusticomys
Six species


Ferreira's Fish-eating Rat Neusticomys ferreirai
Montane Fish-eating Rat Neusticomys monticolus
Musso's Fish-eating Rat Neusticomys mussoi
Oyapock Fish-eating Rat Neusticomys oyapocki
Peruvian Fish-eating Rat Neusticomys peruviensis
Venezuelan Fish-eating Rat Neusticomys venezuelae


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Rheomys
Four species


Mexican Water Mouse Rheomys mexicanus
Goldman's Water Mouse Rheomys raptor
Thomas's Water Mouse Rheomys thomasi
Underwood's Water Mouse Rheomys underwoodi

 

Oryzomyini (rice rats) is the third Tribe from Sigmodontinae. It contains about 125 species in 30 extant genera: Aegialomys, Amphinectomys, Cerradomys, Drymoreomys, Eremoryzomys, Euryoryzomys, Handleyomys, Holochilus, Hylaeamys, Lundomys, Megalomys [extinct], Megaoryzomys [extinct], Melanomys, Microakodontomys, Microryzomys, Mindomys, Neacomys, Nectomys, Nephelomys, Nesoryzomys, Noronhomys [extinct], Oecomys, Oligoryzomys, Oreoryzomys, Oryzomys, Pattonimus, Pseudoryzomys, Scolomys, Sigmodontomys, Sooretamys, Tanyuromys, Transandinomys, Zygodontomys.


Three species are depicted here, from the genera Oligoryzomys and Sooretamys.

 

Aegialomys
Two species. Formerly included in the genus Oryzomys.


Galapagos Rice Rat Aegialomys galapagoensis
Yellowish Rice Rat Aegialomys xanthaeolus


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Amphinectomys
One species


Ucayali Water Rat Amphinectomys savamis


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Cerradomys
Seven species. Formerly included in the genus Oryzomys. Also formerly all lumped as one species, O. subflavus.


Goytaca Rice Rat Cerradomys goytaca
Langguth's Rice Rat Cerradomys langguthi
Maracaju Rice Rat Cerradomys maracajuensis
Marinho's Rice Rat Cerradomys marinhus
Lindbergh's Rice Rat Cerradomys scotti
Terraced Rice Rat Cerradomys subflavus
Vivo's Rice Rat Cerradomys vivoi


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Drymoreomys
One species


White-spotted Mountain Rat Drymoreomys albimaculatus


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Eremoryzomys
One species. Formerly included in the genus Oryzomys.


Grey Rice Rat Eremoryzomys polius


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Euryoryzomys
Six species. Formerly included in the genus Oryzomys.


Emmons's Rice Rat Euryoryzomys emmonsae
Monster Rice Rat Euryoryzomys lamia
Big-headed Rice Rat Euryoryzomys legatus
MacConnell's Rice Rat Euryoryzomys macconnelli
Elegant Rice Rat Euryoryzomys nitidus
Russet Rice Rat Euryoryzomys russatus


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Handleyomys
Eight species. Formerly included in the genus Oryzomys.


Alfaro's Rice Rat Handleyomys alfaroi
Chapman's Rice Rat Handleyomys chapmani
Dusky-footed Rice Rat Handleyomys fuscatus
Colombian Rice Rat Handleyomys intectus
Black-eared Rice Rat Handleyomys melanotis
Striped Rice Rat Handleyomys rhabdops
Long-nosed Rice Rat Handleyomys rostratus
Cloud forest Rice Rat Handleyomys saturatior


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Holochilus
Three species


Web-footed Marsh Rat Holochilus brasiliensis
Chaco Marsh Rat Holochilus chacarius
Amazonian or Common Marsh Rat Holochilus sciureus

 

Hylaeamys
Seven species. Formerly included in the genus Oryzomys.


Bolivian Rice Rat Hylaeamys acritus
Broad-headed Rice Rat Hylaeamys laticeps
Large-headed Rice Rat Hylaeamys megacephalus
Sowbug Rice Rat Hylaeamys oniscus
Perene Rice Rat Hylaeamys perenensis
Tate's Rice Rat Hylaeamys tatei
Yungas Rice Rat Hylaeamys yunganus


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Lundomys
One species


Lund's Water Rat Lundomys molitor


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Megalomys
Four recent species, all now extinct (surviving in the Lesser Antilles until the 19th century).


Barbuda Giant Rat Megalomys audreyae
Martinique Giant Rat Megalomys desmarestii
Barbados Giant Rat Megalomys georginae
Santa Lucia Giant Rat Megalomys luciae


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Megaoryzomys
One species, now extinct (endemic to Santa Cruz Island in the Galapagos)


Galápagos Giant Rat Megaoryzomys curioi


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Melanomys
Three species


Dusky Rice Rat Melanomys caliginosus
Robust Rice Rat Melanomys robustulus
Zuniga's Rice Rat Melanomys zunigae


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Microakodontomys
One species


Intermediate Grass Mouse Microakodontomys transitorius


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Microryzomys
Two species. Formerly included in the genus Oryzomys.


Highland Small Rice Rat Microryzomys altissimus
Forest Small Rice Rat Microryzomys minutus


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Mindomys
One species. Formerly included in the genus Oryzomys.


Hammond's Rice Rat Mindomys hammondi


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Neacomys
Ten species


Dubost's Bristly Mouse Neacomys dubosti
Guianan Bristly Mouse Neacomys guianae
Ruiz's Bristly Mouse Neacomys macedoruizi (described in 2018)
Small Bristly Mouse Neacomys minutus
Musser's Bristly Mouse Neacomys musseri
Paracou Bristly Mouse Neacomys paracou
Rosalind's Bristly Mouse Neacomys rosalindae (described in 2018)
Painted Bristly Mouse Neacomys pictus
Common Bristly Mouse Neacomys spinosus
Narrow-footed Bristly Mouse Neacomys tenuipes

 

Nectomys
Five species


Western Amazonian Water Rat Nectomys apicalis
Magdalena Water Rat Nectomys magdalenae
Trinidad Water Rat Nectomys palmipes
Amazonian Water Rat Nectomys rattus
South American Water Rat Nectomys squamipes


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Nephelomys
Thirteen species. Formerly included in the genus Oryzomys, and formerly all species were lumped under O. albigularis.


Tomes's Rice Rat Nephelomys albigularis
Ecuadorian Rice Rat Nephelomys auriventer
Caracol Rice Rat Nephelomys caracolus
Child's Rice Rat Nephelomys childi
Boquete Rice Rat Nephelomys devius
Keays's Rice Rat Nephelomys keaysi
Light-footed Rice Rat Nephelomys levipes
Spot-bellied Rice Rat Nephelomys maculiventer
Merida Rice Rat Nephelomys meridensis
Mindo Rice Rat Nephelomys moerex
Tungurahua Rice Rat Nephelomys nimbosus
Yellow-striped Rice Rat Nephelomys pectoralis
Mount Pirre Rice Rat Nephelomys pirrensis


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Nesoryzomys
Three extant species


Darwin's Galapagos Mouse Nesoryzomys darwini (known only from a series of specimens collected in 1929)
Fernandina Galapagos Mouse Nesoryzomys fernandinae
Indefatigable Galapagos Mouse Nesoryzomys indefessus
Santiago Galapagos Mouse Nesoryzomys swarthi


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Noronhomys
One species, endemic to the islands of Fernando de Noronha off Brazil, but now extinct (probably soon after the arrival of Europeans in the 16th century).


Vespucci's Rat Noronhomys vespuccii