Hemipsilichthys Eigenmann & Eigenmann 1889
Creators: name: Reis, Roberto E.
name: Pereira, Edson H. L.
name: Armbruster, Jonathan W.
Publisher: name: Zenodo
Year: 2006
Subjects: Biodiversity
Taxonomy
Animalia
Chordata
Actinopterygii
Siluriformes
Loricariidae
Hemipsilichthys

description: HEMIPSILICHTHYS EIGENMANN & EIGENMANN
Xenomystus Lütken (1874): 217 (type species: Xenomystus gobio Lütken, 1874 by original designation. Name preoccupied in fishes by Xenomystus Günther, 1868 as a subgenus of Notopterus).
Hemipsilichthys Eigenmann & Eigenmann, 1889: 46 (type species: Xenomystus gobio Lütken, 1874; name in substitution to Xenomystus Lütken, 1874).
Upsilodus Miranda Ribeiro, 1924: 365 (type species: Upsilodus victori Miranda Ribeiro, 1924 by monotypy).
Diagnosis: No uniquely derived features were found to diagnose Hemipsilichthys. The following features are derived for Hemipsilichthys but are shared with a number of other loricariid groups: (1) anterior and posterior edges of hyohyal bone concave, making it spindle-shaped (character 21–0); (2) some of the bifid neural spines under the dorsal fin are perforated above the spinal cord (character 126–1); (3) adductor fossa of the pectoral girdle displaced laterally by the development of anterior and posterior rims of the fossa (character 152–1); and (4) ventral ridge of the pelvic basipterygium tall (a reversion, character 172–0).
In addition, Hemipsilichthys can be easily recognized by the combination of a high preadipose keel, formed by the azygous preadipose plates, almost symmetrically bifid teeth (Fig. 2) on premaxilla and dentary, small eye (orbital diameter 8.6–16.9% HL), and dorsal-fin membrane not or slightly extended posteriorly but never in contact with the first preadipose plate.KEY TO SPECIES OFHEMIPSILICHTHYS1. Dorsal series of plates reduced, with no plates between dorsal-fin origin and the end of the adipose fin; eye comparatively smaller (orbital diameter 8.6–11.8% HL); dorsal-fin spinelet absent..................................... ...................................................Hemipsilichthys papillatus(Rio Preto basin, Rio Paraíba do Sul drainage) 1′. Dorsal series of plates complete, with plates between head and caudal peduncle; eye comparatively larger (orbital diameter 12.0–16.9% HL); dorsal-fin spinelet present ...................................................................... 2 2. Dorsal fin with seven branched rays; papillae in upper lip forming transversely elongate skin folds; eye comparatively smaller (orbital diameter 12.0–14.7% HL); dorsal-fin spinelet rectangular or oval-shaped (Fig. 3)................................................................................. Hemipsilichthys gobio(Rio Paraíba do Sul basin) 2′. Dorsal fin with eight (rarely seven or nine) branched rays; papillae in upper lip transversely elongate but not fused to form skin folds; eye comparatively larger (orbital diameter 15.3–16.9% HL); dorsal-fin spinelet V-shaped (Fig. 3)........................................... Hemipsilichthys nimius(Rio Perequê-Açu and Taquari basins)
description: Published as part of Reis, Roberto E., Pereira, Edson H. L. & Armbruster, Jonathan W., 2006, Delturinae, a new loricariid catfish subfamily (Teleostei, Siluriformes), with revisions of Delturus and Hemipsilichthys, pp. 277-299 in Zoological Journal of the Linnean Society 147 (2) on pages 280-281, DOI: 10.1111/j.1096-3642.2006.00229.x, http://zenodo.org/record/4687405