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A new species of mesonychian mammal from the lower Eocene of Mongolia and its phylogenetic relationships

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Geisler J. H., McKenna M. C.

Acta Palaeontologica Polonica

2007

tom 52

nr 1

We describe Dissacus zanabazari new species from a partial skeleton collected from the early Eocene Bumban Member of the Naran Bulak Formation at Tsagaan Khushuu (Omnogov Province, Mongolia). The holotype includes most of the skull with basicranium, mandibles, well preserved upper and lower dentitions, partially articulated left manus and right tarsus, and most of the long bones in the limbs. The presence of a rudimentary 1st metatarsal is confirmed in mesonychids, and the relatively unworn lower incisors display an unexpected trilobed morphology. Autapomorphies of this new species are short face, absence of diastemata between the lower premolars (except between p1 and p2), m3 metaconid subequal to protoconid, and foramen for superior ramus of stapedial artery entirely within the petrosal. A phylogenetic analysis of 89 characters scored for 14 mesonychians and 5 outgroups resulted in 8 most parsimonious trees. Dissacus zanabazari is in a clade with D. navajovius, but this genus is otherwise paraphyletic. The strict consensus of the eight trees has a monophyletic Mesonychia, Hapalodectidae, and Mesonychidae; Dissacus and Ankalagon as the most basal mesonychid genera; and paraphyly of Pachyaena.

Ograniczanie wyników

1 Acta Palaeontologica Polonica

1 Geisler J. H.

1 McKenna M. C.

1 2007

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A new species of mesonychian mammal from the lower Eocene of Mongolia and its phylogenetic relationships