Rucervus Rucervus is a genus of deer from India , Nepal , Indochina , and the Chinese island of Hainan . They are threatened by habitat loss and hunting, and one species has already gone extinct . Type species: Cervus elaphoides Hodgson, 1835, a junior synonym of Cervus duvaucelii Cuvier , 1823. The species of the genus Rucervus are characterized by a specific antler bauplan: its basal ramification is often supplemented with an additional small prong, the middle tine is never present, while the crown tines are inserted on the posterior side of the beam and may be bifurcated or fused into a small palmation.Species Rucervus duvaucelii - barasinga or swamp deer Rucervus schomburgki - Schomburgk's deer Rucervus simplicidens Rucervus colberti Rucervus gigans Croitor, 2018 Rucervus ardei Rucervus radulescu i Croitor, 2018 Rucervus giulii Rucervus verestchagini According to the old tradition of zoological taxonomy, swamp deer originally were regarded as members of the genus Cervus. Rucervus was originally proposed by Hodgson as a subgenus of the genus Cervus. The original definition of Rucervus was mostly based on antler shape believed to be intermediate between that of 'elaphus ' and 'hippelaphus '. Hodgson reported that upper canines are present only in males of barasinga, but the additional craniological material shows that upper canines are present in both sexes. Eld's deer was regarded as another species of the genus Rucervus , however, the recent genetic evidences suggest that the Eld's deer should be moved back to Cervus , or placed in its own genus, Panolia .Rucervus is an ancient cervid lineage that--together with the genus Axis --represents the oldest evolutionary radiation of the subfamily Cervinae .Paleontological record The fossil species of Rucervus of Europe were included in the genus Arvernoceros Heintz, 1971 or in the genus Eucladoceros , as in the case of R. giulii . Today, Arvernoceros is regarded as a subgenus of Rucervus . The European fossil forms of Rucervus are distinguished from the South Asian species by more compact crown part of the antler and by the frequent development of a small distal palmation as for instance in R. ardei and R. radulescui . South Asian fossil forms of Rucervus are represented by large-sized R. simplicidens and R. colberti . The late Early Pleistocene of Greece has yielded the remains of a giant species R. gigans that rivaled in size Irish elk Megaloceros giganteus , The giant Rucervus from Greece is distinguished by unusually for such a large animal long limbs and apparently is closely related to R. simplicidens and R. colberti from the Sivaliks.The Southwest-Europe endemic Mid to early Late Pleistocene genus Haploidoceros is regarded as closely allied.
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