ELLIOTHERIUM KERSTENI, A NEW TRITHELEDONTID FROM THE LOWER ELLIOT FORMATION (UPPER TRIASSIC) OF SOUTH AFRICA
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Abstract:
We describe a new tritheledontid, Elliotherium kersteni n. gen. and sp., on the basis of a partial skull collected from the lower Elliot Formation (Upper Triassic; Euskelosaurus Range Zone) on the farm Beatrix, Free State Province, South Africa. Although similar to Pachygenelus, the genus differs from other South African tritheledontids in its higher maxillary postcanine tooth count, lack of labial cingula on the upper postcanine teeth, shorter secondary palate, retention of a median vomerine ridge behind the secondary palate, and smaller interpterygoid vacuity. With regard to these features, Elliotherium is most similar to the South American tritheledontid Chaliminia. Elliotherium is autapomorphic in its possession of a long parasphenoid rostrum, ventrally depressed secondary palate, medially convex margins of the interpterygoid vacuity, and a thin lamina of palatine covering the interpterygoid vacuity. Although Elliotherium is the stratigraphically lowest positioned tritheledontid from southern Africa, it is still probably later occurring than the South American taxa Chaliminia or Riograndia. Based on a revision of a previous analysis of advanced cynodont relationships, we propose a sister-group relationship between Elliotherium and Chaliminia, although support for this pairing is weak.Keywords:
Rostrum
Autapomorphy
Rostrum
Subfamily
Tribe
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A new genus Mosirites is herein erected for a Cretaceous heteromorph ammonoid that ranges from the upper Albian to the lower Cenomanian of Hokkaido. The new genus differs from previously described genera of the family Anisoceratidae by its large, loosely coiled, early helical whorls followed by loosely coiled elliptical planispiral whorls. Two new species, M. serpentiformis sp. nov. and M. mirabilis sp. nov., are described from the upper Albian and the upper Albian to lower Cenomanian interval, respectively. Mosirites was probably derived from Anisoceras during late Albian time and flourished during late Albian to early Cenomanian time in the North Pacific region.
Cenomanian
Ammonoidea
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The new genus Repandocosta is described for twelve North American and at least three European ostracode species that have been placed mainly in Trachyleberidea or Cythereis. Cythereis pauca Schmidt, 1948, is designated as the type species. The new genus has a stratigraphic range in North America of Coniacian [Cretaceous] to upper Eocene; in Europe it is known from middle Paleocene to upper Oligocene.
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