MolluscaBase name details
Crassatellites andrewsi J. Henderson, 1934 †
1698638 (urn:lsid:marinespecies.org:taxname:1698638)
unaccepted > superseded combination
Species
marine, brackish, fresh, terrestrial
fossil only
Henderson, J. (1934). Some new Mesozoic Mollusca from the Rocky Mountain region and Arizona. <em>Journal of Paleontology.</em> 8(3): 259-263.
page(s): 261, Pl. 36, figs 6a-d [details] Available for editors
[request]
page(s): 261, Pl. 36, figs 6a-d [details] Available for editors
[request]
Original description Shell of moderate size, subtriangular, more or less excavated in front of the beaks. Postero-dorsal margin nearly straight....
Original description Shell of moderate size, subtriangular, more or less excavated in front of the beaks. Postero-dorsal margin nearly straight. Posterior end obliquely truncated, forming an angle of 85 to 90 degrees with the ventral margin. Anterior end narrowly rounded, then swinging by a more gentle curve into the ventral margin. Ventral margin usually nearly straight, but with a tendency toward convexity in mature examples. Umbones prominent, raised well above the hinge, situated about one-fourth the distance from the anterior end. Angle of divergence of dorsal and anterior margins 90 to 92 degrees. Lunule oval, deeply excavated, sharply defined. Escutcheon long, oval, deep and usually well-defined. Surface of valves covered with numerous, strong, semiregular, rounded ridges, mostly of about the same width as the grooves between them. Interior ventral margins armed with closely-set, strong, interlocking teeth, which are plainly exhibited externally on some specimens. Hinge, muscle scars and pallial line not known. This species is quite distinct from the one from approximately the same horizon in Huerfano Park, Colorado, C. excavata (Stanton). It is more nearly related to C. cimarronensis (White), from which it differs especially in its more nearly triangular outline and the more acute angle of divergence of the dorsal and anterior margins. It is much less inflated and longer in proportion to its height than the recently described C. wyomingensis Sidwell, and the posterior end is more distinctly truncated. In outline and sculpture it is suggestive of Astarte conradiana Whiteaves, but is more decidedly triangular and more distinctly angled posteriorly. Type, from the Frontier (upper Benton) Cretaceous, 21 to 22 miles southeast of Lander, Wyoming, on the Haley road, Univ. of Colo. Museum, No. 10677-A: Length 29.5 mm., height 24 mm., convexity 14.5 mm. It is named in honor of Mr. Philip Andrews, who first called it to my attention many years ago. It is abundant at the type locality, associated with Camptonectes platessa White, Ostrea sannionis White, Liopistha sp., cf. L. meeki White, Anatina lineata Stanton(?), Turritella whitei Stanton and other fossils. It was also obtained 6 miles northwest of Cumberland, Wyoming, by Mr. D. F. Higgins [details]
MolluscaBase eds. (2024). MolluscaBase. Crassatellites andrewsi J. Henderson, 1934 †. Accessed at: https://www.molluscabase.org/aphia.php?p=taxdetails&id=1698638 on 2024-04-28
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original description
Henderson, J. (1934). Some new Mesozoic Mollusca from the Rocky Mountain region and Arizona. <em>Journal of Paleontology.</em> 8(3): 259-263.
page(s): 261, Pl. 36, figs 6a-d [details] Available for editors [request]
page(s): 261, Pl. 36, figs 6a-d [details] Available for editors
[request] From editor or global species database
Original description Shell of moderate size, subtriangular, more or less excavated in front of the beaks. Postero-dorsal margin nearly straight. Posterior end obliquely truncated, forming an angle of 85 to 90 degrees with the ventral margin. Anterior end narrowly rounded, then swinging by a more gentle curve into the ventral margin. Ventral margin usually nearly straight, but with a tendency toward convexity in mature examples. Umbones prominent, raised well above the hinge, situated about one-fourth the distance from the anterior end. Angle of divergence of dorsal and anterior margins 90 to 92 degrees. Lunule oval, deeply excavated, sharply defined. Escutcheon long, oval, deep and usually well-defined. Surface of valves covered with numerous, strong, semiregular, rounded ridges, mostly of about the same width as the grooves between them. Interior ventral margins armed with closely-set, strong, interlocking teeth, which are plainly exhibited externally on some specimens. Hinge, muscle scars and pallial line not known. This species is quite distinct from the one from approximately the same horizon in Huerfano Park, Colorado, C. excavata (Stanton). It is more nearly related to C. cimarronensis (White), from which it differs especially in its more nearly triangular outline and the more acute angle of divergence of the dorsal and anterior margins. It is much less inflated and longer in proportion to its height than the recently described C. wyomingensis Sidwell, and the posterior end is more distinctly truncated. In outline and sculpture it is suggestive of Astarte conradiana Whiteaves, but is more decidedly triangular and more distinctly angled posteriorly. Type, from the Frontier (upper Benton) Cretaceous, 21 to 22 miles southeast of Lander, Wyoming, on the Haley road, Univ. of Colo. Museum, No. 10677-A: Length 29.5 mm., height 24 mm., convexity 14.5 mm. It is named in honor of Mr. Philip Andrews, who first called it to my attention many years ago. It is abundant at the type locality, associated with Camptonectes platessa White, Ostrea sannionis White, Liopistha sp., cf. L. meeki White, Anatina lineata Stanton(?), Turritella whitei Stanton and other fossils. It was also obtained 6 miles northwest of Cumberland, Wyoming, by Mr. D. F. Higgins [details]
