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Phylogenetic position of the crocodylian Megadontosuchus arduini and tomistomine palaeobiogeography

100%

Piras P., Delfino M., Del Favero L., Kotsakis T.

Acta Palaeontologica Polonica

2007

tom 52

nr 2

A cladistic analysis of Megadontosuchus arduini from the middle Eocene of Monte Duello (NE Italy) confirms its tomistomine relationships, but the low number of scorable characters determines a low resolution within the tomistomine clade. However, Megadontosuchus is clearly distinct from the other Eocene European or North African tomistomines, in having a moderate elongated but robust rostrum, massive maxillary and dentary teeth and large supratemporal fenestrae. The rostrum and teeth characteristics could indicate that M. arduini had a degree of feeding specialization intermediate between Maroccosuchus zennaroi and the Eocene European tomistomines. A summary of tomistomine palaeobiogeography suggests that despite only one species with a rather restricted range survives at present, such a clade had a glorious past with a world wide distribution documented by a conspicuous fossil record that starts at least in the early Eocene. At present, a detailed knowledge of tomistomine palaeobiogeography is hindered by the lack of modern taxonomic revisions of some fossil remains and therefore by the poor understanding of phylogenetic relationships.

In quest of the Pteraichnus trackmaker: Comparisons to modern crocodilians

80%

Kubo T.

Acta Palaeontologica Polonica

2008

tom 53

nr 3

The Pteraichnustrackmaker is usually hypothesized to be either a pterosaur or a crocodilian. Though the latter interpretation is recently not widely accepted, more experimental work on trackways of extant crocodilians is necessary to settle the debate. Here, the trackways of three species of modern crocodiles (Paleosuchus trigonatus, Crocodylus porosus, and Tomistoma schlegelii) in all major gaits and postures, namely sprawling, walking and running, were compared with Pteraichnus trackways. In all experimentally generated crocodilian trackways pentadactyl manus tracks are recognized, the external width between pes tracks is wider than the corresponding internal width between manus tracks, and tail marks are usually present. All crocodilian trackways collected in the present study revealed significant differences from Pteraichnus, which strongly suggests a non−crocodilian origin of Pteraichnus.

Ograniczanie wyników

2 Acta Palaeontologica Polonica

1 Del Favero L.

1 Delfino M.

1 Kotsakis T.

1 Kubo T.

1 Piras P.

1 2008

1 2007

Wyniki wyszukiwania

Phylogenetic position of the crocodylian Megadontosuchus arduini and tomistomine palaeobiogeography

In quest of the Pteraichnus trackmaker: Comparisons to modern crocodilians