Pterosturisoma Isbruecker & Nijssen, 1978

Raphael Covain & Sonia Fisch-Muller, 2007, The genera of the Neotropical armored catfish subfamily Loricariinae (Siluriformes: Loricariidae): a practical key and synopsis., Zootaxa 1462, pp. 1-40: 34

publication ID


publication LSID

persistent identifier

treatment provided by


scientific name

Pterosturisoma Isbruecker & Nijssen, 1978


Pterosturisoma Isbruecker & Nijssen, 1978  ZBK  .

Type species: Harttia microps Eigenmann & Allen, 1942  ZBK  .

Lectotype: CAS 28543, Peru, Iquitos . 

Gender: neutral.

This monotypic genus is known only from the upper Amazon River basin. Pterosturisoma  ZBK  is 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. Pterosturisoma  ZBK  appears morphologically very similar to Lamontichthys  ZBK  from 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 Sturisoma  such 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  ZBK  , suggesting these two genera share a closer relationship with Sturisoma  than with Harttia  ZBK  as hypothesized by Rapp Py-Daniel (1997).