Oncopteridae, Campbell & Chen & Chanet & Chen & Lee, 2019

Campbell, Matthew A., Chen, Wei-Jen, Chanet, Bruno, Chen, Jhen-Nien & Lee, Mao-Ying, 2019, Origins and relationships of the Pleuronectoidei: Molecular and morphological analysis of living and fossil taxa, Zoologica Scripta 48 (5), pp. 640-656 : 652

5.2 | Oncopteridae , new family

5.2.1 | Diagnosis

The diagnostic characters follow the information from Norman (1934) and Chapleau (1993). Oncopteridae is recognized by this combination of features: Eyes on the right side; large foramen on branchial septum between lower pharyngeals and urohyal; origin of dorsal fin anterior of eyes above blind‐side nostrils; first dorsal‐fin ray specialized, enlarged, hard, curved, and movable, and connects with first strongly developed basal bone of the fin, contained in a deep groove on blind‐side head; pelvic fins asymmetric and separated by anal fin, ocular‐side pelvic fin located much more anterior than that of the blind side; six pelvic‐fin rays; lateral line with distinctive semi‐circular curve above the pectoral fin and several transverse supratemporal accessory branches from main lateral line to dorsal edge of body.

5.2.2 | Composition

This family includes a single genus, Oncopterus , with a single species Oncopterus darwinii Steindachner, 1874 .

5.2.3 | Distribution

Southwestern Atlantic ( Brazil to Argentina), distributed in shallow coastal waters (20–80 m).