Polycladus Pomel, 1854[1] Eucladoceros (Greek for "well-branched antler") is an extinct genus of large deer whose fossils have been discovered across Eurasia, from Europe to China, spanning from the Late Pliocene-Early Pleistocene.

European species lie E. dicranios and E. ctenoides are suggested to have reached a body mass of 250–300 kilograms (550–660 lb),[3] while East Asian E. boulei is suggested to have reached body masses of 350 kilograms (770 lb).

The majority of those species names are synonymous, and at present only two or three good species are recognized: E. dicranios from England, Italy and Azov Sea Area in South Russia; E. ctenoides from Greece, Italy, France, Spain, the Netherlands, and England; and E. teguliensis (a senior synonym of E. senezensis) from France, the Netherlands, and Britain.

Analysis of the limbs of Eucladoceros suggest that they are most similar to living deer that occupy open habitats.

[8] Dental microwear analysis of Eucladoceros ctenoides suggests that its diet was largely plastic and widely varied according to local conditions.