Hispanodorcas orientalis Bouvrain and Bonis, 1988

Kostopoulos, Dimitris S., 2014, Taxonomic re-assessment and phylogenetic relationships of Miocene homonymously spiral-horned antelopes, Acta Palaeontologica Polonica 59 (1), pp. 9-29 : 12

Hispanodorcas orientalis Bouvrain and Bonis, 1988

Fig. 2 .

Holotype: partial skull with horncores and associated parts of maxillae and mandible, LGPUT DKO−4 ( Fig. 2 ; Bouvrain and Bonis 1988: figs. 1, 2).

Type locality: Dytiko−3, Axios Valley, Greece.

Type horizon: Late Turolian (MN13; Koufos 2006), Late Miocene.

Diagnosis.—As in Bouvrain and Bonis (1988).

Differential diagnosis.— H. orientalis differs from other members of the genus in its slightly smaller size, as well as its more transversely compressed and more strongly distally diverging horncores, with the latter bearing a blunt anterior keel ( Fig. 2 ). It additionally differs from H. torrubiae in having shorter horncores without transverse ridges.

Remarks.—Contrary to Bouvrain and Bonis (1988), I suggest that the anterior surface of the horncore of H. orientalis is marked by a moderately developed, proximally blunt and anteromedially descending keel ( Fig. 2B ). The lateral groove on the horncore of H. orientalis is much less developed than in the holotype of H. torrubiae , appearing only on the proximal third of the horncore as part of the characteristic shallow depression developed along the entire anterolateral surface ( Bouvrain and Bonis 1988: figs. 1, 2; Fig. 2A ). The upper third of the posterior surface of the horncore of H. orientalis shows a rather deep, longitudinal furrow with sharp, keel−like edges, similar to the condition seen in H. torrubiae ( Thomas et al. 1982: 214) .

Geographic and stratigraphic range.—Late Turolian (Late

Miocene) of Greece.

Figures

Fig. 2. Oiocerin antelope Hispanodorcas orientalis Bouvrain and Bonis, 1988, from the late Turolian locality of Dytiko−3 (DKO), Axios Valley, Northern Greece, in lateral (A) and anterior (B) views of the holotype cranium LGPUT DKO−4. The arrow in A indicates an enlarged version of the same view, where the white lines indicate the extent of the lateral depression; the arrows in B mark the trace of the anterior keel.