Oioceros Gaillard, 1902

Kostopoulos, Dimitris S., 2014, Taxonomic re-assessment and phylogenetic relationships of Miocene homonymously spiral-horned antelopes, Acta Palaeontologica Polonica 59 (1), pp. 9-29 : 18

Genus Oioceros Gaillard, 1902

Type species: Oioceros rothii ( Wagner, 1857) ; see below.

Emended diagnosis.—Plesiomorphic traits: small−sized bovids with moderately thin and gradually tapering horncores; horncores inserted above the orbits, moderately spaced on the frontals, weakly divergent at mid−height, and running parallel distally; lacrimal fossa deep; ethmoidal fissure open; postcornual fossae present; premolars long compared to the molars. Apomorphic traits: horncores homonymously twisted (Ẑ1 coil), relatively long, and weakly or moderately compressed mediolaterally ( Fig. 1 ), with a flattened anterolateral surface; anterior keel blunt or absent; lateral keel well developed and associated with an anterior longitudinal furrow dividing the horncore into a larger anterior and a smaller posterior portion; orbits protruding laterally; frontals depressed anterior to the pedicles; supraorbital foramina small and located within deep pits.

Figures

Fig. 1. Box−plots of the horncore basal compression index (i.e., TD*100/ ADP) for several species and genera of Oiocerina, showing the medial (horizontal line inside the boxes), the 25–75% quartiles (gray boxes) and the minimum and maximum range of values (short horizontal lines). NKT−1, Nikiti−1; RZ1, Ravin des Zouaves 1.