Atuco-tuco is a neotropical rodent in the family Ctenomyidae.[1][2] Tuco-tucos belong to the only living genus of the family Ctenomyidae, Ctenomys, but they include approximately 60 different species. The common name, "tuco-tuco", comes from the "tuc-tuc" sound they make while they dig their burrows.[3]
The relationships among the species are debated by taxonomists. It has been described that they are in a state of "taxonomic chaos", but banded karyotypes have been used to help make progress on their taxonomic study.[4] Their closest relatives are degus and other octodontids.[1] All species of tuco-tucos are found in South America from Peru and central Brazil southward. The tuco-tucos of South America have an ecological role equivalent to that of the pocket gophersofNorth America.
Tuco-tucos have heavily built cylindrical bodies with short legs and their pelage ranges in color from black to light grey.[3] Their skin is loosely applied, possibly to slide about the tunnels they create. They have long fore feet for burrowing, and bristled hind feet for grooming. They also have large heads, small ears, and hairy tails. Their bodies range in size from 15–25 cm (5.9–9.8 in) in length, and they can weigh as little as 100 grams (C. pundti) to more than 1000 grams (C. conover).[6][7]
Members of the genus Ctenomys are widely distributed, but over 50 of the species are found in the southern half of South America.[4] They can be seen in many areas from the southern portion of Peru and southern Brazil to the Tierra del Fuego at the southernmost tip of South America, through parts of Chile and a majority of Uruguay, Paraguay, Bolivia, and Argentina. Their ranges occur from coastal grasslands to mountain slopes, including the Andean Puna at over 4000 meters,[2] and depend on factors such as soil type, ambient temperature, and primary productivity.[7] The only sympatric distribution of this genus occurs between C. australis and C. talarum in a coastal dune region.[8]
Tuco-tucos live in excavated burrows and spend a majority (up to 90%) of their lives underground. It is estimated that they represent about 45% of all the underground rodents of the world.[9] Their burrows maintain a fairly constant temperature and humidity level that is independent of the geographic region.[10] In order to excavate the soil, they have many morphological adaptations, including their body shape, reduced eyes, and strong limbs.[11] Their olfaction is increased and is used to help orient themselves during digging and establishing a territory.[12] The two techniques they use for digging are scratch-digging and skull-tooth digging. A combination of the two methods are often used. Their claws and forelimbs are used primarily for scratch-digging, and their skull and incisor teeth are used secondarily for skull-tooth digging.[11]
Very little is known about the courtship of the tuco-tucos, as it takes place underground inside their burrows. It is known that the male takes an aggressive posture and exchanges chemical or acoustic signals with the female.[3]
Among their most notable features is that various members of the genus exhibit differing levels of genetic variability and sociality.[14] Most of these species are solitary animals; however, some are semisocial or social,[4] with a tendency for the most social species (e.g. C. sociabilis) to have the least genetic variation.[15][16]
While the processes behind its diversification are unknown, it has been suggested that they are among the most diversely speciated genus of mammals, largely due to chromosomal rearrangements and rapid speciation since their appearance in the late Pliocene or early Pleistocene era. Their chromosomal diversity is so impressive because their diploid numbers range from 10 to 70.[4]
^ abcdLessa, Enrique P.; Cook, Joseph A. (1998). "The Molecular Phylogenetics of Tuco-Tucos (genus Ctenomys, Rodentia: Octodontidae) Suggests an Early Burst of Speciation". Molecular Phylogenetics and Evolution. 9 (1): 88–99. doi:10.1006/mpev.1997.0445. PMID9479698.
^Chimento, Nicolás R.; Agnolin, Federico L.; Novas, Fernando E. (2015). "The bizarre 'metatherians' Groeberia and Patagonia, late surviving members of gondwanatherian mammals". Historical Biology: An International Journal of Paleobiology. 27 (5): 603–623. doi:10.1080/08912963.2014.903945. hdl:11336/85076. S2CID216591096.
^ abLuna, Facundo; Antinuchi, C. Daniel (2007). "Energy and Distribution in Subterranean Rodents: Sympatry between Two Species of the Genus Ctenomys". Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology. 147 (4): 948–954. doi:10.1016/j.cbpa.2007.02.032. PMID17407828.
^De Santi, Nahuel A.; Verzi, Diego H.; Olivares, A. Itatí; Piñero, Pedro; Morgan, Cecilia C.; Medina, Matías E.; Rivero, Diego E.; Tonni, Eduardo P. (2020). "A new peculiar species of the subterranean rodent Ctenomys (Rodentia, Ctenomyidae) from the Holocene of central Argentina". Journal of South American Earth Sciences. 100: Article 102499. Bibcode:2020JSAES.10002499D. doi:10.1016/j.jsames.2020.102499. S2CID213216992.