Ixinandria Isbrücker & Nijssen, 1979

Ixinandria Isbrücker & Nijssen, 1979 View in CoL View at ENA

Ixinandria Isbrücker & Nijssen , in Isbrücker, 1979: 87 and 91, figs. 1-4.

Type species: Loricaria steinbachi Regan, 1906 , by original designation. Gender: feminine.

Diagnosis. Among loricariines Ixinandria is most similar to Rineloricaria and can be distinguished from most genera by the total lack of abdominal plates, including the preanal plate. Hartiella and a few species of Harttia also have the abdomen completely devoid of plates, and can be distinguished from Ixinandria by having 12 branched caudal-fin rays (vs. 10 in Ixinandria ) and by the absence of postorbital notch, which is present in Ixinandria . Species of Crossoloricaria , Spatuloricaria , and Loricaria sometimes lack a preanal plate, but small abdominal plates are present. Some species of Rineloricaria have a naked abdomen, but a preanal plate is always present, except in R. setepovos . This species, however, has a caudal-fin filament and 3-4 premaxillary teeth. Ixinandria can also be distinguished from other loricariines by the shape and number of premaxillary teeth. Ixinandria has wide and almost symmetrical tooth cusps, and up to 18 teeth in each premaxilla ( vs. premaxilla with up to 13 narrow and clearly asymmetrical teeth in other loricariines, except Rineloricaria aequalicuspis which has up to 15 narrow teeth with nearly symmetrical cusps, and some hartiini, which also have many asymmetrical premaxillary teeth).