INVESTIGADORES
SCANFERLA Carlos Agustin
artículos
Título:
Postnatal development of the skull of Dinilysia patagonica (Squamata-stem Serpentes)
Autor/es:
SCANFERLA, AGUSTÍN; BHULLAR, BHART-ANJAN
Revista:
ANATOMICAL RECORD-ADVANCES IN INTEGRATIVE ANATOMY AND EVOLUTIONARY BIOLOGY
Editorial:
WILEY-LISS, DIV JOHN WILEY & SONS INC
Referencias:
Lugar: New York; Año: 2014 vol. 297 p. 560 - 573
ISSN:
1932-8486
Resumen:
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The snake skull
represents a profound transformation of the ancestral squamate cranium in which
dermal skull roof bones were integrated with the braincase, in a manner
convergent with that which occurred during the origin of mammals. However, the
ontogeny of snake characters at the origin of the clade has until now been
inaccessible. Here we describe a postnatal ontogenetic series of the Late Cretaceous
stem snake Dinilysia patagonica and compare it to that of extant lizards and
snakes. Comparative analysis indicates notable ontogenetic changes, including
advanced state of ossification, isometric growth of the otic capsule, fusion of
the stylohyal to the quadrate, and great posterior elongation of the
supratemporal. Of these transformations, the unfused condition of braincase
bones and the retention of a large otic capsule in adults are examples of
paedomorphic and peramorphic processes, respectively. Some ontogenetic
transformations detected, in particular those present in middle ear, skull roof
and suspensorium, are strikingly similar to those present in extant snakes. Nevertheless,
Dinilysia retains a lizard-like paroccipital process without an epiphyseal
extremity, and a calcified epiphysis that caps the sphenoccipital tubercle.
Finally, the integration of the dermal skull roof with the braincase is similar
to that seen in mammals with regard to the overall closure of the braincase,
but the two evolutionary and developmental modules appear less integrated in
snakes in that the parietal bone of the dermal skull roof progressively
overlaps the supraoccipital of the chondrocranial
