The coruro (''Spalacopus cyanus'') is a

species A species () is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction. It is the basic unit of Taxonomy (biology), ...

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

in the family

Octodontidae Octodontidae is a family of rodents, restricted to southwestern South America. Fourteen species of octodontid are recognised, arranged in seven genera. The best known species is the common degu, ''Octodon degus''. Octodontids are medium-sized ...

. It is the only species in the genus ''Spalacopus''. The species is

endemic Endemism is the state of a species being found only in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also foun ...

to central

Chile Chile, officially the Republic of Chile, is a country in western South America. It is the southernmost country in the world and the closest to Antarctica, stretching along a narrow strip of land between the Andes, Andes Mountains and the Paci ...

, where it has been found in a wide variety of habitats, from coastal to montane. It is

fossorial A fossorial animal () is one that is adapted to digging and which lives primarily (but not solely) underground. Examples of fossorial vertebrates are Mole (animal), moles, badgers, naked mole-rats, meerkats, armadillos, wombats, and mole salamand ...

and lives in colonies.

Description

Coruros are robust rodents with large heads, short necks and stocky bodies. The fur is short and dark brown, turning blackish on the feet. Their eyes and ears are small and their tails are short and smooth. They are strongly modified for life underground. They have large

incisor Incisors (from Latin ''incidere'', "to cut") are the front teeth present in most mammals. They are located in the premaxilla above and on the mandible below. Humans have a total of eight (two on each side, top and bottom). Opossums have 18, wher ...

s that curve forward and which are used to loosen soil and gnaw through roots, strong forelimbs for digging and powerful hind limbs for moving soil and kicking it out of the entrance to the burrow. They weigh between . Their

molars The molars or molar teeth are large, flat tooth, teeth at the back of the mouth. They are more developed in mammal, mammals. They are used primarily to comminution, grind food during mastication, chewing. The name ''molar'' derives from Latin, '' ...

have reentrant folds that do not meet in the middle. Their tails are scaly and hairless. They can be either black or dark brown.

Distribution and habitat

Coruros occur along the coast from Alicahue (32°19'S) to Los Cipreses (34°01'S), and in the

Andes The Andes ( ), Andes Mountains or Andean Mountain Range (; ) are the List of longest mountain chains on Earth, longest continental mountain range in the world, forming a continuous highland along the western edge of South America. The range ...

up to 3500 m altitude from Alicahue (32°19'S) to Los Cipreses (34°01'S). It inhabits a range of habitats including alpine grasslands in the mountains, acacia savannah in the

Chilean Central Valley The Central Valley (), Intermediate Depression, or Longitudinal Valley is the depression between the Chilean Coastal Range and the Andes Mountains. The Chilean Central Valley extends from the border with Peru to Puerto Montt in southern Chile, wi ...

, semi-stabilized sand dunes and coastal grassland.

Ecology

Coruros are colonial rodents, a number of individuals occupying a single burrow system. They are also unusual amongst rodents in that they are nomadic; when their food is becoming exhausted in one locality, they move as a group to another locality and create a new burrow. They live in smaller colonies that broke up from a large population. They leave behind bulbs in order for them to grow, thus allowing them to return to the area for vegetation. It is a vocal species, emitting a range of distinctive calls. They tend to feed on Huilli or other vegetation. They have predators such as hawks, owls, and wild cats. They have a certain reproduction time from June to March. They can produce up to six offspring. Their gestation period last about 77 days. The offsprings eyes open about four days after birth. They are not currently endangered. Coruros feed entirely underground on grasses, herbs, roots and bulbs of geophytes such as '' Leucocoryne ixioides'' (which forms the bulk of its diet), '' Dioscorea longipes'', or species of ''

Libertia ''Libertia'' is a genus of monocotyledonous plants in the family Iridaceae, first described as a genus in 1824.

'', '' Sisyrinchium'' or '' Alophia''.

References

{{Taxonbar, from=Q1135691 Octodontidae Mammals of Chile Mammals described in 1782 Taxa named by Juan Ignacio Molina Taxonomy articles created by Polbot Endemic fauna of Chile