Isorineloricaria Isbrücker 1980

Ray, C. Keith & Armbruster, Jonathan W., 2016, The genera Isorineloricaria and Aphanotorulus (Siluriformes: Loricariidae) with description of a new species, Zootaxa 4072 (5), pp. 501-539 : 526

Isorineloricaria Isbrücker 1980

Isorineloricaria Isbrücker, 1980: 15 . Type species: Plecostomus spinosissimus Steindachner, 1880 . Type by original designation.

Diagnosis. Isorineloricaria can be separated from Hypostomus by having hypertrophied odontodes on the heads and lateral plates of nuptial males (vs. hypertrophied odontodes absent), from Aphanotorulus and Hypostomus by having caudal peduncles that greatly lengthed with size and that are round in cross section (vs. caudal peduncle proportions remaining the same through life and caudal peduncle oval in cross section), and by having large dark spots (spots almost as large as lateral plates) on a nearly white background (vs. small spots, several per plate, and light tan background). Isorineloricaria can be further separated from the taxa recognized in Armbruster’s Corymbophanini by having an adipose fin (vs. adipose fin replaced by postdorsal ridge of 13–17 azygous plates); from the Corymbophanini and Rhinelepinae by having the iris operculum (vs iris operculum absent); from the Rhinelepinae by lacking exposure of the coracoid strut (vs. coracoid strut exposed, supporting odontodes), and by having the anal fin I,4 (vs. I,6); from the Pterygoplichthyini by having the stomach attached via the dorsal mesentery only (vs. connected to the lateral abdominal walls by a connective tissue sheet) and by usually having one plate between the supra-preopercle and opercle, rarely two (vs. two to three); from the Ancistrini (except Spectracanthicus murinus and some Pseudancistrus ) and the Pterygoplichthyini by having the cheek plates evertible to about 30° to the head and generally lacking hypertrophied odontodes on the cheek plates with the only exception nuptial males in a few species (vs. cheek plates evertible to 70° or more and hypertrophied odontodes usually present); from Spectracanthicus by having the dorsal and adipose fins separate (vs. connected by a posterior extension of the dorsal fin), and from Pseudancistrus without evertible cheek plates by having three plates between the head and dorsal fin (including the nuchal plate, vs. four or more).