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New data on the anatomy and relationships of the Paleocene crocodylian Akanthosuchus langstoni

100%

Hill R. V., Lucas S. G.

Acta Palaeontologica Polonica

2006

tom 51

nr 3

The phylogenetic relationships of the Paleocene crocodylian Akanthosuchus langstoni are assessed using published data matrices and morphological data from the holotype and referred specimens. Cladistic analyses indicate that Akanthosuchus is unequivocally nested within Alligatoroidea. Weak support from a majority rule consensus tree indicates that Akanthosuchus may be more closely allied with alligatorines than with caimanines, but in the strict consensus tree these relationships remain ambiguous. There is no evidence from phylogenetic analyses to support the hypothesis that Akanthosuchus represents the postcrania of the Paleocene crocodylians Navajosuchus or Ceratosuchus. Growth marks observed in histological sections of osteoderms of the holotype of Akanthosuchus langstoni indicate that it was at least eight years old at the time of death. Although the individual may not have been fully mature at the time of death, lineage dwarfism cannot be ruled out as a possible reason for its relatively small size.

Cynodont teeth from the Carnian [Late Triassic] of Northern Italy

100%

Renesto S., Lucas S. G.

Acta Palaeontologica Polonica

2009

tom 54

nr 2

357-360

A jaw fragment with three teeth preserved, collected from the Gorno Formation (Carnian, Upper Triassic) of Lombardy (Italy) is described. The teeth are transversely elongated, threecusped and bear anterior and posterior cingula. Their overall morphology supports their identification as postcanines of a “eucynodontian”. The unique tooth morphology of the new specimen supports its attribution to a new genus and species, while at the same time precluding positive assignment to already known gomphodont families. There is a fairly small record of gomphodont cynodonts in Europe, so that the described specimen adds to the knowledge of the distribution and diversity of European gomphodonts and it also represents the first ever collected in Italy.

Ograniczanie wyników

2 Acta Palaeontologica Polonica

2 Lucas S. G.

1 Hill R. V.

1 Renesto S.

1 2009

1 2006

Wyniki wyszukiwania

New data on the anatomy and relationships of the Paleocene crocodylian Akanthosuchus langstoni

Cynodont teeth from the Carnian [Late Triassic] of Northern Italy