Colomesus tocantinensis Amaral, Brito, Silva & Carvalho, 2013

Family:  Tetraodontidae (Puffers), subfamily: Tetraodontinae
Max. size:  3.49 cm SL (male/unsexed)
Environment:  demersal; freshwater
Distribution:  South America: Brazil.
Diagnosis:  This species is distinguished from its congeners (asellus, psittacus) by the following characters: basal pterygiophores 6-7 and anal-fin rays 9 (vs. 10-11 for both its congeners); basal pterygiophores and dorsal-fin rays 10 (vs. 11); an opercle with a posterior ventral border subdivided in a ventral and a posterior region, the herein called ‘‘inverted V’’ shape (vs. triangular opercle); differs from C. asellus by the absence of dermal flaps across the chin (vs. uniquely present in C. asellus); caudal peduncle with 8 vertebrae (Ref. 122317).
Biology: 
IUCN Red List Status: Not Evaluated (N.E.) Ref. (130435)
Threat to humans:  harmless


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