Pseudotothyris obtusa

Pseudotothyris obtusa has its dorsal fin between with 8 and 10 soft rays with 6 or 7 in its anal fin. This species is told apart from other species in its genus by having fewer pharyngeal teeth, a snout covered in plates and having scattered plates on the abdomen instead of having a completely naked abdome. It also lacks any saddle marks and has the odontodes on the lateral plates neatly arranged in rows. This species reaches a standard length of 4 cm (1.6 in).

Pseudotothyris obtusa is endemic to Brazil where it is found in coastal drainages in the southeast of that country from São Sebastião in the Brazilian state of São Paulo to Ilha de Superagui, Paranaguá Bay in the state of in Paraná. It is found among emergent vegetation, fallen wood and leaf litter.

Pseudotothyris obtusa is classified in the genus Pseudotothyris, this name prefixes pseudo-, meaning “false”, onto Otothyris, as these fishes appear to bear some resemblance to that genus but that resemblance is misleading. The specific name, obtusa, is Latin meaning "blunt" or "dull", Ribeiro did not explain this but it may be an allusion to the small platelet on teh snout whivh have small, so blunter, spines on them.