Suborder HISTRICOMORPHA
Hystricomorpha is the third largest of the five rodent Suborders. With around 300 species it is trailing just behind Sciuromorpha's c.320 species. However both fall well below the largest Suborder, Myomorpha (mice and rats), which has around 1500 species.
The Suborder can be divided broadly in two groups, from the Old World and New World respectively. The latter have at times been separated entirely as their own Suborder, Caviomorpha.
The families are listed below:
Old World:
Family Diatomyidae / Laonastidae - Laotian Rock Rat (1 sp)
Family Ctenodactylidae - Gundis (5 spp)
Family Bathyergidae - Blesmols or African Mole Rats (c.25 spp)
Family Hystricidae - Old World Porcupines (11 spp)
Family Petromuridae - Dassie Rat (1 sp)
Family Thryonomyidae - Cane Rats (2 spp)
New World:
Family Erethizontidae - New World Porcupines (c.17 spp)
Family Chinchillidae - Chinchillas and Viscachas (7 spp)
Family Dinomyidae - Pacarana (1 sp)
Family Caviidae - Cavies (c.20 spp)
Family Dasyproctidae - Agoutis (c.13 spp)
Family Cuniculidae - Pacas (2 spp)
Family Ctenomyidae - Tuco-tucos (c.65 spp)
Family Octodontidae - Octodonts (14 spp)
Family Abrocomidae - Chinchilla Rats (c.10 spp)
Family Echimyidae - New World Spiny Rats (c.90 spp)
Family Myocastoridae - Coypu (1 sp)
Family Capromyidae - Hutias (c.13 spp)
In total there are eighteen families in Histricomorpha, collectively containing about 300 species in 72 genera. Of those, there are only 73-75 species from 35 genera depicted here, although collectively they represent seventeen of the eighteen families.
Family Diatomyidae / Laonastidae - Laotian Rock Rat
One species, in the genus Laonastes
Not represented in the Zoochat galleries.
Family Ctenodactylidae - gundis
Five species in four genera: Ctenodactylus, Felovia, Massoutiera, Pectinator
Two species are represented in the Zoochat galleries, from the genera Ctenodactylus and Pectinator.
Family Bathyergidae - blesmols or African mole rats
About twenty-five species in six genera: Bathyergus, Cryptomys, Fukomys, Georychus, Heliophobius, Heterocephalus
Eight species from four genera (Fukomys, Georychus, Heliophobius, Heterocephalus) are represented in the Zoochat galleries.
Family Hystricidae - Old World porcupines
Eleven species in three genera: Atherurus, Hystrix, Trichys
Ten species from two genera (Atherurus and Hystrix) are represented in the Zoochat galleries.
Family Petromuridae - Dassie Rat
One species, in the genus Petromus
Represented in the Zoochat galleries.
Family Thryonomyidae - cane rats
Two species in a single genus: Thryonomys
One species is represented in the Zoochat galleries.
Family Erethizontidae - New World porcupines
About seventeen species in three genera: Chaetomys, Coendou, Erethizon
Twelve species, representing all three genera, are represented in the Zoochat galleries.
Family Chinchillidae - chinchillas and viscachas
Seven species in three genera: Chinchilla, Lagidium, Lagostomus
Four species, covering all three genera, are represented in the Zoochat galleries.
Family Dinomyidae - Pacarana
One species, in the genus Dinomys
Represented in the Zoochat galleries.
Family Caviidae - cavies
About twenty species in six genera: Cavia, Dolichotis, Galea, Hydrochoerus, Kerodon, Microcavia
Eleven (perhaps twelve) species, covering all six genera, are represented in the Zoochat galleries.
Family Dasyproctidae - agoutis
About thirteen species in two genera: Dasyprocya and Myoprocta
Eight or nine species, representing both genera, are depicted in the Zoochat galleries.
Family Cuniculidae - pacas
Two species in a single genus, Cuniculus
Both species are represented in the Zoochat galleries.
Family Ctenomyidae - tuco-tucos
About sixty-five species in a single genus, Ctenomys
Only three species are represented in the Zoochat galleries.
Family Octodontidae - octodonts
Fourteen species in eight genera: Aconaemys, Octodon, Octodontomys, Octomys, Pipanacoctomys, Spalacopus, Tympanoctomys. A ninth genus, Salinoctomys, is now combined in Tympanoctomys.
Only two species, from two genera (Octodon and Spalacopus), are represented in the Zoochat galleries.
Family Abrocomidae - chinchilla rats
About ten species in two genera: Abrocoma, Cuscomys
Just one species is depicted in the Zoochat galleries, from the genus Abrocoma.
Family Echimyidae - New World spiny rats
About ninety species in twenty-one genera: Callistomys, Carterodon, Clyomys, Dactylomys, Diplomys, Echimys, Euryzygomatomys, Hoplomys, Isothrix, Kannabateomys, Lonchothrix, Makalata, Mesomys, Olallamys, Pattonomys, Phyllomys, Proechimys, Santamartamys, Thrichomys, Trinomys, Toromys
Only four species from three genera (Hoplomys, Isothrix, Proechimys) are represented in the Zoochat galleries.
Family Myocastoridae - Coypu or Nutria
One species, in the genus Myocastor
Represented in the Zoochat galleries.
Family Capromyidae - hutias
About thirteen extant species in five genera: Capromys, Geocapromys, Mesocapromys, Mysateles, Plagiodonta
Only two species from two genera (Capromys, Plagiodonta) are pictured in the Zoochat galleries.