The armored rat (''Hoplomys gymnurus'') is a species of

rodent Rodents (from Latin , 'to gnaw') are mammals of the order Rodentia (), which are characterized by a single pair of continuously growing incisors in each of the upper and lower jaws. About 40% of all mammal species are rodents. They are na ...

in the family

Echimyidae Echimyidae is the family of neotropical spiny rats and their fossil relatives. This is the most species-rich family of hystricognath rodents. It is probably also the most ecologically diverse, with members ranging from fully arboreal to terres ...

. It is

monotypic In biology, a monotypic taxon is a taxonomic group (taxon) that contains only one immediately subordinate taxon. A monotypic species is one that does not include subspecies or smaller, infraspecific taxa. In the case of genera, the term "unispec ...

within the genus ''Hoplomys''. It is found in

Latin America Latin America or * french: Amérique Latine, link=no * ht, Amerik Latin, link=no * pt, América Latina, link=no, name=a, sometimes referred to as LatAm is a large cultural region in the Americas where Romance languages — languages derived f ...

, from northern

Honduras Honduras, officially the Republic of Honduras, is a country in Central America. The republic of Honduras is bordered to the west by Guatemala, to the southwest by El Salvador, to the southeast by Nicaragua, to the south by the Pacific Oce ...

to northwest

Ecuador Ecuador ( ; ; Quechua: ''Ikwayur''; Shuar: ''Ecuador'' or ''Ekuatur''), officially the Republic of Ecuador ( es, República del Ecuador, which literally translates as "Republic of the Equator"; Quechua: ''Ikwadur Ripuwlika''; Shuar: ''Eku ...

. It possesses a range of spines on its back and sides of the body.

Description

Adults weigh between with males weighing more on average than females. They are born with soft fur, and the spines begin growing after the first month. The thick spines on the back and sides measure up to and in diameter. The head and body measures between in length, with the tail adding another . The color of the armored rat range from black to reddish brown, and has a pure white underside. They are similar in appearance to Tome's spiny-rat, but the eyes of the armored rat are smaller and they have a longer

snout A snout is the protruding portion of an animal's face, consisting of its nose, mouth, and jaw. In many animals, the structure is called a muzzle, rostrum, or proboscis. The wet furless surface around the nostrils of the nose of many mammals is c ...

. Its diet includes fruit, insects and green plant matter. The normal litter size is one to three.

Habitat

The armored rat is a nocturnal species, which occupies burrows. These burrows are usually positioned in steep banks close to a water source, and can measure up to in length before reaching a nesting chamber. They are distributed from northern

to northwest

, from lowlands up to around in altitude, including Panamana's isolated Caribbean island of

Isla Escudo de Veraguas Isla Escudo de Veraguas is a small (4.3 km2) isolated Caribbean island of the Republic of Panama. Despite its name, it is not part of the province of Veraguas, but rather Bocas del Toro. Although located only 17 km from the coastline ...

Etymology

* The genus name ''Hoplomys'' derives from the two

Ancient Greek Ancient Greek includes the forms of the Greek language used in ancient Greece and the ancient world from around 1500 BC to 300 BC. It is often roughly divided into the following periods: Mycenaean Greek (), Dark Ages (), the Archaic peri ...

words (), meaning "armor", and (), meaning "rat". * The species name ''gymnurus'' derives from the two

words (), meaning "naked", and (), meaning "tail".

Phylogeny

Part of the infraorder

Hystricognathi The Hystricognathi are an infraorder of rodents, distinguished from other rodents by the bone structure of their skulls. The masseter medialis (a jaw muscle) passes partially through a hole below each eye socket (called the infraorbital foramen) ...

and family

, armored rats are more closely related to

porcupine Porcupines are large rodents with coats of sharp spines, or quills, that protect them against predation. The term covers two families of animals: the Old World porcupines of family Hystricidae, and the New World porcupines of family, Erethizont ...

Guinea pigs The guinea pig or domestic guinea pig (''Cavia porcellus''), also known as the cavy or domestic cavy (), is a species of rodent belonging to the genus ''Cavia'' in the family Caviidae. Breeders tend to use the word ''cavy'' to describe the ani ...

chinchillas Chinchillas are either of two species (''Chinchilla chinchilla'' and ''Chinchilla lanigera'') of crepuscular rodents of the parvorder Caviomorpha. They are slightly larger and more robust than ground squirrels, and are native to the Andes mounta ...

, and

common degus The common degu (''Octodon degus''; ), or, historically, the degu, is a small hystricomorpha rodent endemic to the Chilean matorral ecoregion of central Chile. The name ''degu'' on its own indicates either the entire genus '' Octodon'' or, more ...

than to the common

brown rat The brown rat (''Rattus norvegicus''), also known as the common rat, street rat, sewer rat, wharf rat, Hanover rat, Norway rat, Norwegian rat and Parisian rat, is a widespread species of common rat. One of the largest muroids, it is a brown o ...

. Within Echimyidae, the genus ''Hoplomys'' is the sister group to the genus ''Proechimys''. In turn, these two taxa share evolutionary affinities with other

Myocastorini Myocastorini is a tribe of echimyid rodents, proposed in 2017, and containing the five extant genera ''Callistomys'', ''Hoplomys'', ''Myocastor'', ''Proechimys'', and ''Thrichomys ''Thrichomys'' is a genus of South American rodents in the fam ...

genera: ''Callistomys'' (painted tree-rats) and ''Myocastor'' (coypus or nutrias) on the one hand, and ''Thrichomys'' on the other hand.

References

;Specific ;General *Woods, C. A. and C. W. Kilpatrick. 2005. Hystricognathi. pp 1538–1600 ''in'' Mammal Species of the World a Taxonomic and Geographic Reference 3rd ed. D. E. Wilson and D. M. Reeder eds. Smithsonian Institution Press, Washington D.C.

External links

{{Taxonbar, from=Q302616 Echimyidae Mammals of Colombia Mammals of Ecuador Mammals described in 1897 Taxa named by Oldfield Thomas Rodents of Central America Rodents of South America Taxonomy articles created by Polbot