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1 September 2003 A REVISION OF THE EARLY TRIASSIC “CAPITOSAURS” (STEGOCEPHALI, STEREOSPONDYLI) FROM MADAGASCAR, WITH REMARKS ON THEIR COMPARATIVE ONTOGENY
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Abstract
The “capitosaurs” from the Lower Triassic of Madagascar are revised. Benthosuchus madagascariensis Lehman, 1961, and Wetlugasurus milloti Lehman, 1961, are combined in the new combination Watsonisuchus madagascariensis on the basis of the most complete growth series among capitosaurians. A phylogenetic analysis showed that the genus Watsonisuchus is justified, although its species W. madagascariensis is not the most derived within the genus. The skull growth of W. madagascariensis clearly shows an allometric trend, but the fact that adults have more dermo-sensory grooves than juveniles suggests surprisingly that they may have become progressively more aquatic during growth. The ontogeny of W. madagascariensis is compared with that of other temnospondyls. Different longirostrine conditions are observed in Permian and Triassic stereospondylomorphs (archegosaurians and capitosaurians, respectively). They are interpreted as convergences rather than are a synapomorphy of the clade.
and J. SEBASTIEN STEYER "A REVISION OF THE EARLY TRIASSIC “CAPITOSAURS” (STEGOCEPHALI, STEREOSPONDYLI) FROM MADAGASCAR, WITH REMARKS ON THEIR COMPARATIVE ONTOGENY," Journal of Vertebrate Paleontology 23(3), (1 September 2003). https://doi.org/10.1671/1740
Received: 11 August 2000; Accepted: 1 June 2002; Published: 1 September 2003
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