Caiman venezuelensis

Caiman venezuelensis is an extinct species of caiman that lived in South America during the Pleistocene. The holotype of C. venezuelensis — OR-1677, a partial left premaxilla bone — was discovered in the locality of El Breal of Orocual, in the Mesa Formation, in the state of Monagas, Venezuela, the country of which derives their species name.[1]

Caiman venezuelensis
Temporal range: Pleistocene (Uquian-Lujanian)
~2.588–0.012 Ma
↓
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Order: Crocodilia
Family: Alligatoridae
Genus: Caiman
Species:
†C. venezuelensis
Binomial name
†Caiman venezuelensis
Fortier & Rincón, 2012

Cidade et al. (2019) rejected the classification of C. venezuelensis as a distinct species, and considered it to be a junior synonym of the extant spectacled caiman (Caiman crocodilus).[2]

Description

The premaxilla preserved measures 24.6 millimetres (0.97 in) long, with an estimated total length of 28 to 30 millimetres (1.1 to 1.2 in). It has a strong premaxillary sutural surface, a hole developed in the fourth tooth of the jaw bone, and short spaces between the alveoli, indicating that despite its size, their characteristics were different from the current young alligatorids and thus corresponds to subadult or adult individual. Then C. venezuelensis could one of the smallest known species of alligatorids, even smaller than the dwarf caimans of the genus Paleosuchus. It is also distinguished from other alligatorids have long narrow premaxilla, about twice as long as wide.[1]

Distribution

Despite the abundance of fossil sites of the Pliocene and Pleistocene in South America, the remains of crocodilians of these periods are scarce and fragmentary and generally little studied. C. venezuelensis is one of the few findings confirmed of a distinct species of this period and may help clarify the history of this group after the Miocene.[1]

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References
  1. Costa Fortier, Daniel; Daniel Rincón, Ascanio (2012). "Pleistocene crocodylians from Venezuela, and the description of a new species of Caiman". Quaternary International. 305: 141–148. doi:10.1016/j.quaint.2012.03.018.
  2. Giovanne M. Cidade; Daniel Fortier; Ascanio Daniel Rincón; Annie Schmaltz Hsiou (2019). "Taxonomic review of two fossil crocodylians from the Cenozoic of South America and its implications for the crocodylian fauna of the continent". Zootaxa. 4656 (3): 475–486. doi:10.11646/zootaxa.4656.3.5.
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