The genera of the Neotropical armored catfish subfamily Loricariinae (Siluriformes: Loricariidae): a practical key and synopsis. Raphael Covain Sonia Fisch-Muller Zootaxa 2007 1462 1 40 63R69 1748039 urn:lsid:zoobank.org:act:7ACC60A4-B761-49E0-8F48-7C049EE133D6 Actinopterygii Loricariidae Pterosturisoma Animalia Pterosturisoma Isbrücker & Nijssen 1978:69 Siluriformes 34 Chordata genus  This monotypic genus is known only from the upper Amazon River basin. Pterosturisomais a rheophilic species. Evers & Seidel (2005) described this species as an open brooder. Males do not possess hypertrophied odontodes neither on the sides of head, nor on pectoralfin spines. Nevertheless, Evers & Seidel (2005) distinguished both sexes by the width of a naked trapezoidal area framed by four bony plates in the genital region. This area appeared broader in females, and longer and narrower in males. Pterosturisomaappears morphologically very similar to Lamontichthysfrom which it differs primarily in the number of pectoral fin rays (i-6 in the former versus i-7 in the latter). These two genera share features with Sturisomasuch as similar body depth at dorsal-fin origin, presence of filamentous extensions on caudal-fin spines, and complete abdominal plate cover extending to the lower lip margin. These features are never observed in Harttia, suggesting these two genera share a closer relationship with Sturisomathan with Harttiaas hypothesized by Rapp Py-Daniel (1997). 923893131 CAS Peru Iquitos CAS 28543 Lectotype