Cyclocardia Conrad 1867 ...
Genus Cyclocardia Conrad, 1867 Type species. Cardita borealis Conrad, 1831 (pl. 8, fig. 1) (subsequent designation by Stolickza, 1871). Pleistocene–Recent, Northwest Atlantic Ocean. Diagnosis. Carditid with thick shell, subcircular outline and convex dorsal margin. Umbo rounded. Right anterior tooth...
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| Format: | Text |
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Zenodo
2017
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| Online Access: | https://dx.doi.org/10.5281/zenodo.6030256 https://zenodo.org/doi/10.5281/zenodo.6030256 |
| Summary: | Genus Cyclocardia Conrad, 1867 Type species. Cardita borealis Conrad, 1831 (pl. 8, fig. 1) (subsequent designation by Stolickza, 1871). Pleistocene–Recent, Northwest Atlantic Ocean. Diagnosis. Carditid with thick shell, subcircular outline and convex dorsal margin. Umbo rounded. Right anterior tooth small, middle tooth very curved, broad and thick. Left anterior tooth large and posterior tooth strong and very curved. External sculpture of 15 to 27 entire and smooth radial ribs, that are low and covered by small subcircular or subrectangular nodes. Periostracum coarse and hirsute in living species. Included species. Cyclocardia is an Eocene to Recent cosmopolitan genus that includes more than a hundred species (Maxwell 1969; Coan 1977; Stilwell & Zinsmeister 1992; Kafanov et al. 2001; Huber 2010; Güller & Zelaya 2013). Remarks. Conrad (1867) highlighted that this genus was characterized by a thick shell with a coarse periostracum, generally smooth radial ribs and strongly inclined posteriorly hinge ... : Published as part of Pérez, Damián E. & Del Río, Claudia J., 2017, Systematics of the family Carditidae (Bivalvia: Archiheterodonta) in the Cenozoic of Argentina, pp. 51-84 in Zootaxa 4338 (1) on page 57, DOI: 10.11646/zootaxa.4338.1.3, http://zenodo.org/record/1035558 ... |
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