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Cymbospondylus pdf available (finally)
Sorry for cross posting.
Just to inform that the pdf of the paper
Balini M. and Renesto S. C.
Cymbospondylus vertebrae (Ichcthyosauria, Shastasauridae) from the upper
Anisian Prezzo Limestone (Middle Triassic, Southern Alps) with an overview of
the chronbostratigraphic distribution of the group .
Rivista Italiana di Paleontologia e Stratigrafia 118 n.1 (2012)
is finally available. Those interested can ask directly to me (if those who
already asked wil ask again I will be grateful) , I warn you that the pdf is
rather huge (dont ask me why, ), about 3MB .
Four vertebral centra from the well known fossil-bearing Prezzo Limestone
(Upper Anisian, Middle Triassic) at the newly discovered locality Piazza
Brembana (Bergamo) are described. The four bones were found exposed on the bed
surface in an articulated position. Despite the incompleteness of three centra
due to erosion, their otherwise fairly good preservation facilitated their
study and attribution to a shastasaurid ichthyosaur. Even though the
classification of isolated vertebral centra at the genus level is
controversial, the presence of diapophyses truncated by the cranial margin of
the centra is still considered to be diagnostic for Cymbospondylus. The new
discovery comes from an ammonoid-bearing facies, which is not unusual for
ichthyosaurs, and the bio-chronostratigraphic position of the Piazza Brembana
bones is accurately defined by ammonoids from the lowest part of the Trinodosus
Zone (Illyrian, Middle Triassic). Records of Cymbospondylus in the Southern
Alps, Germanic Basin, western United States and Spitsbergen are summarized and
all previous occurrences of the genus are bio-chronostratigraphically
correlated by utilizing the abundant ammonoid literature. The single occurrence
of Phantomosaurus neubigii is also considered, since this species is regarded
in the literature as the sister taxon of Cymbospondylu. Material referred to
Cymbospondylus extends from a single occurrence in the Olenekian (late Early
Triassic) to the Longobardian (Late Ladinian), and its stratigraphic
distribution is strictly controlled by the development of basins. Within these
basins the distribution of specimens appears to include relatively protected
and shallow waters. Such a distribution is consistent with the mode of life of
this group of ichthyosaurs as suggested by morphofunctional analysis.
Cymbospondylus, like most Triassic Ichthyosaurs, probably was an undulatory
swimmer, more maneuverable but slower than their Jurassic successors.
"Live until old, learn until old"
Ancient saying from Baguazhang Masters .
Silvio C. Renesto
Associate Professor of Palaeontology
DiSTA (Department of Theoretical and Applied Sciences)
Università degli Studi dell'Insubria
via Dunant 3
21100 Varese Italy
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