Translator Disclaimer
1 November 2010 Cassiavellia galtarae, New Species, New Genus: A New Permian Bivalve and its Significance for Pterioidean Systematics
Ilya Tëmkin, John Pojeta Jr.
Author Affiliations +
Abstract

An exceptionally well-preserved silicified bivalve from the Upper Permian of Texas is described and assigned to a new genus and species, Cassiavellia galtarae, placed in the family Bakevelliidae. The species represents one of the earliest and best characterized unequivocal occurrences of the multivincular ligament in the superfamily Pterioidea. The silicified material provides a wealth of information on the morphology of inadequately known Paleozoic pterioideans, including hitherto undescribed aspects of the larval shell, auricular sulcus, muscle scars, and dental ontogeny. The discovery of the condyle-fossa complex on the anteroventral shell margin, a feature previously undescibed in Bivalvia, raises the question of the homology and taxonomic significance of the problematic subumbonal ridge-like structures in Pterioidea. In life, C. galtarae was probably an epifaunal right-pleurothetic bivalve, byssally attached to hard or raised flexible substrata. In addition to C. galtarae, another new species, C. nadkevnae, is placed in Cassiavellia.

Ilya Tëmkin and John Pojeta Jr. "Cassiavellia galtarae, New Species, New Genus: A New Permian Bivalve and its Significance for Pterioidean Systematics," Journal of Paleontology 84(6), 1152-1176, (1 November 2010). https://doi.org/10.1666/10-022.1
Accepted: 18 July 2010; Published: 1 November 2010
JOURNAL ARTICLE
25 PAGES


Share
SHARE
KEYWORDS
Bakevelliidae
Cassianellidae
functional morphology
ligament
ontogeny
ARTICLE IMPACT
RIGHTS & PERMISSIONS
Get copyright permission
Back to Top