Biology:Myocastorini

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Short description: A tribe of mammals belonging to the spiny rat family of rodents

Myocastorini
Nutria Myocastor coypus Wildpark Poing-10.jpg
Nutria (Myocastor coypus)
Scientific classification e
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Rodentia
Family: Echimyidae
Subfamily: Echimyinae
Tribe: Myocastorini
Fabre et al. 2017 [1]
Genera

Callistomys
Hoplomys
Myocastor
Proechimys
Thrichomys

Myocastorini is a tribe of echimyid rodents, proposed in 2017, and containing the five extant genera Callistomys, Hoplomys, Myocastor, Proechimys, and Thrichomys.[1]

Definition

Myocastorini members share long upper incisor roots (except Callistomys), and mid- to long-sized lower incisor roots. These five genera share either four (Callistomys, Thrichomys) or five (Hoplomys, Myocastor, Proechimys) lophids on the lower deciduous fourth premolar, three roots anchoring the upper molars, and well-connected lophs on cheek teeth.[1]

Members display a variety of lifestyles including terrestrial (Hoplomys, Proechimys, Thrichomys), arboreal (Callistomys), and amphibious (Myocastor) adaptations.

Phylogeny

On the one hand, the genus Proechimys is the sister group to the genus Hoplomys (armored rats), and both form a clade of lowland rainforest terrestrial spiny rats. On the other hand, Callistomys (painted tree-rats) is the sister group to Myocastor (coypus). In turn, these two pairs of genera share evolutionary affinities with Thrichomys (punaré).

Genus-level cladogram of the Myocastorini.

References

  1. 1.0 1.1 1.2 Fabre, Pierre-Henri; Upham, Nathan S.; Emmons, Louise H.; Justy, Fabienne; Leite, Yuri L. R.; Loss, Ana Carolina; Orlando, Ludovic; Tilak, Marie-Ka et al. (2017-03-01). "Mitogenomic Phylogeny, Diversification, and Biogeography of South American Spiny Rats". Molecular Biology and Evolution 34 (3): 613–633. doi:10.1093/molbev/msw261. ISSN 0737-4038. PMID 28025278. 

Wikidata ☰ Q48836446 entry