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Paleosuchus trigonatus (SCHNEIDER, 1801)

IUCN Red List - Paleosuchus trigonatus - Least Concern, LR

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Higher TaxaAlligatoridae, Crocodylia, crocodiles (alligators)
Common NamesE: Schneider's smooth-fronted caiman, Cachirre, Jacaré coroa.
G: Keilkopf-Glattstirnkaiman
Portuguese: Caimão-de-Cara-Lisa, Jacaré-de-Cara-Lisa, Jacaré-Pedra, Jacaré-Coroa, Jacaré-Curuá 
SynonymCrocodilus trigonatus SCHNEIDER 1801: 161
Paleosuchus trigonatus — DUELLMAN 1978: 195
Paleosuchus trigonatus — KING & BURKE 1989
Paleosuchus trigonatus — GORZULA & SEÑARIS 1999
Paleosuchus trigonatus — LEHR 2002: 69 
DistributionBolivia, Brazil (incl. Amazonas, Mato Grosso, Pará, Roraima), Colombia, Ecuador, French Guiana, Guyana, Peru, Suriname, Venezuela. Much overlap with Paleosuchus palpebrosus, but not as extensive southwards (probably due to a decreased cold tolerance in comparison with P. palpebrosus).

Type locality: unknown (fide WERMUTH & MERTENS 1977)  
Reproductionoviparous. Exhibits temperature‐dependent sex determination (TSD) fide Cornejo-Páramo et al. 2020 (and references therein). 
TypesLectotype: ZMB 243, Paralectotype: ZFMK 52352. KING & BURKE 1989 listed ZMB 243 (erroneously) as holotype. 
CommentMüller (1924: 319) showed that Crocodylus niloticus was based on Seba's illustration of Paleosuchus trigonatus; see also Schmidt (1928); Stejneger (1933); and Mook and Mook (1940) (after King & Burke 1989).

Type species: Crocodilus trigonatus SCHNEIDER 1801: 161 is the type species of the genus Paleosuchus GRAY 1862: 330. 
EtymologyNamed after Greek trigonos = three-cornered and the Latin suffic -atus, meaning provided with; a reference to the shape of the head.

The genus was named after Greek palaios = ancient; and Greek soukhos, the name for the crocodile in one part of Egypt (fide Gotch 1986). 
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  • Böhme, Wolfgang 2014. Herpetology in Bonn. Mertensiella 21. vi + 256 pp. - get paper here
  • Campbell Jr., Kenneth E. 1973. Habitat Notes on Paleosuchus trigonatus (Schneider) in Peru. Journal of Herpetology 7 (3): 318-320 - get paper here
  • Campos Z, Muniz F, Magnusson WE 2017. Extension of the geographical distribution of Schneider’s Dwarf Caiman, Paleosuchus trigonatus (Schneider, 1801) (Crocodylia: Alligatoridae), in the Amazon-Cerrado transition, Brazil. Check List 13 (4): 91–94 - get paper here
  • Campos, Z., Muniz, F., Magnusson, W. E., Rodrigues, D., Rossi, R., Júnior, N. S., & Silva, R. L. 2022. A growth model for Paleosuchus trigonatus (Crocodylia: Alligatoridae) from the Rio Negro predicts growth of individuals from the Xingu River, Brazil. Phyllomedusa 21(2): 117-123 - get paper here
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