| Autor: |
Egi, Naoko, Holroyd, PatriciaA., Tsubamoto, Takehisa, Soe, AungNaing, Takai, Masanaru, Ciochon, RussellL. |
| Zdroj: |
Journal of Systematic Palaeontology; January 2005, Vol. 3 Issue: 4 p337-358, 22p |
| Abstrakt: |
SYNOPSISRecent expeditions in the Pondaung Formation have revealed an assemblage of hyaen‐odontid creodonts from the late middle Eocene of Myanmar. Among the three proviverrines known from the fauna, Kyawdawia lupinagen. et sp. nov. is represented by the most complete dental materials. Kyawdawiais similar to the proviverrines known from the Eocene and middle Miocene of India‐Pakistan and from the late Eocene to middle Miocene of Africa, in that it has a short protocone and strong buccal cingulum on M1–2, a small metaconid on m2–3 and a well‐basined talonid on p4‐m2. In addition, it lacks an anterior accessory cusp on p4 and the distinction between the hypoconulid and entoconid on the lower molars. It is unique among the Afroasian proviverrines in lacking a protocone lobe on P4 and in having a broader paracone relative to the metacone on M1–2. This species is one of the largest proviverrines and was estimated to be the size of a red wolf. The type specimen includes postcranial materials. The well‐developed deltopectoral crest, supracondylar ridge and medial epicondyle of the humerus and the relatively short gracile tibia suggest some digging adaptations, while the two well preserved caudal vertebrae indicate the presence of a long tail. The cladistic analysis of 14 proviverrines from Europe and Afroasia based on dental morphologies supports the monophyly of proviverrines from Africa and South and Southeast Asia. This group must have originated from the European forms by the early Eocene and dispersed into South and Southeast Asia. Kyawdawiais phylogenetically closest to Masrasectorfrom the late Eocene to early Oligocene of Egypt and Oman, and the second closest to Paratritemnodonfrom the middle Eocene of India‐Pakistan. The other two Pondaung proviverrines, Yarshea cruentaand an indeterminate proviverrine, are also close to these genera. |
| Databáze: |
Supplemental Index |
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