Morfología del miembro anterior de Geosaurus

HERRERA, Y.; M. FERNANDEZ, Y J. VARELA

AMEGHINIANA

ASOCIACION PALEONTOLOGICA ARGENTINA

Año: 2009 vol. 46 p. 657 - 667

0002-7014

Abstract. FORELIMB MORPHOLOGY OF GEOSAURUS ARAUCANENSIS GASPARINI AND DELLAPÉ, 1976 (CROCODYLIFORMES: THALATTOSUCHIA). The Metriorhynchidae has been interpreted as the only clade of archosaurs entirely adapted to pelagic marine life. The cranial morphology of these crocodyliforms is well known, however the number of contributions that include postcranial descriptions is scarce, especially about the appendicular skeleton. To resolve the conflict about the phylogenetic relationships of this group, as well as to test the macroevolutionary patterns is necessary to incorporate information about all regions of the skeleton. In this paper, we describe for the first time the forelimb of Geosaurus araucanensis Gasparini and Dellapé, 1976. The articulated forelimb of one specimen allows recognising one ossified element that belongs to the proximal carpus, which has never been described for Metriorhynchidae. Herein we proposed that this ossified element is the pisiform.FORELIMB MORPHOLOGY OF GEOSAURUS ARAUCANENSIS GASPARINI AND DELLAPÉ, 1976 (CROCODYLIFORMES: THALATTOSUCHIA). The Metriorhynchidae has been interpreted as the only clade of archosaurs entirely adapted to pelagic marine life. The cranial morphology of these crocodyliforms is well known, however the number of contributions that include postcranial descriptions is scarce, especially about the appendicular skeleton. To resolve the conflict about the phylogenetic relationships of this group, as well as to test the macroevolutionary patterns is necessary to incorporate information about all regions of the skeleton. In this paper, we describe for the first time the forelimb of Geosaurus araucanensis Gasparini and Dellapé, 1976. The articulated forelimb of one specimen allows recognising one ossified element that belongs to the proximal carpus, which has never been described for Metriorhynchidae. Herein we proposed that this ossified element is the pisiform.ROCODYLIFORMES: THALATTOSUCHIA). The Metriorhynchidae has been interpreted as the only clade of archosaurs entirely adapted to pelagic marine life. The cranial morphology of these crocodyliforms is well known, however the number of contributions that include postcranial descriptions is scarce, especially about the appendicular skeleton. To resolve the conflict about the phylogenetic relationships of this group, as well as to test the macroevolutionary patterns is necessary to incorporate information about all regions of the skeleton. In this paper, we describe for the first time the forelimb of Geosaurus araucanensis Gasparini and Dellapé, 1976. The articulated forelimb of one specimen allows recognising one ossified element that belongs to the proximal carpus, which has never been described for Metriorhynchidae. Herein we proposed that this ossified element is the pisiform.Geosaurus araucanensis Gasparini and Dellapé, 1976. The articulated forelimb of one specimen allows recognising one ossified element that belongs to the proximal carpus, which has never been described for Metriorhynchidae. Herein we proposed that this ossified element is the pisiform.