Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-21138
Hautmann, M (2010). The first scallop. Paläontologische Zeitschrift, 84:317-322.
|PDF - Registered users only|
Scallops (Pectinidae) are a highly diverse bivalve family with a long evolutionary history, but insufficient knowledge on the internal shell characters of initial taxa has hampered clarification of their phylogenetic roots. Here, morphological details of the shell interior of the basal pectinid Pleuronectites laevigatus from the Middle Triassic are documented for the first time. It is shown that ligament morphology, lack of internal buttresses and hinge articulation, presence of a right anterior auricular scroll, procrescent discs, and differential valve convexity of Pleuronectites link Pectinidae with Early Triassic aviculopectinoids rather than with entoliids, as recently proposed. The key adaptations of Pectinidae, i.e. the ctenolium and the alivincular-alate ligament system, probably evolved in conjunction with a marked size increase that required improvements in the shell attachment and in the system for opening the valves. Although Pleuronectites laevigatus is recognized as the earliest known member of the Pectinidae, a diphyletic origin of this family from different stocks within the Aviculopectinoidea cannot be ruled out.
|Item Type:||Journal Article, refereed, original work|
|Communities & Collections:||07 Faculty of Science > Paleontological Institute and Museum|
|DDC:||560 Fossils & prehistoric life|
|Uncontrolled Keywords:||Bivalves Pectinidae Triassic Evolution Life habit|
|Deposited On:||12 Oct 2009 16:09|
|Last Modified:||23 Nov 2012 16:54|
Users (please log in): suggest update or correction for this item
Repository Staff Only: item control page