MolluscaBase taxon details
Crassatella camurus Pritchard, 1903 †
1722459 (urn:lsid:marinespecies.org:taxname:1722459)
accepted
Species
marine, brackish, fresh, terrestrial
fossil only
Pritchard, G. B. (1903). Contributions to the palaeontology of the older Tertiary of Victoria. Lamellibranchs. Part 3. <em>Proceedings of the Royal Society of Victoria, New Series.</em> 15: 87-103., available online at https://www.biodiversitylibrary.org/page/8493564
page(s): 96-97, Pl. XIV, figs. 5-9 [details]
page(s): 96-97, Pl. XIV, figs. 5-9 [details]
Original description Shell ovate, thick and solid, of medium size, with a very short anterior, and a somewhat attenuate posterior; strong,...
Original description Shell ovate, thick and solid, of medium size, with a very short anterior, and a somewhat attenuate posterior; strong, broad, and prominent umbos medially depressed. Slightly concave anterior to the beaks, slightly to deeply concave posterior to the beaks, ventral margin very slightly convex, medial portion usually straight. Umbos strongly incurved and rather coarsely corrugated, the first 4 millimetres of the beak bearing from 8 to 10 corrugations, the umbonal region rapidly broadens and becomes depressed. Umbo-post-ventral keel only moderately developed and convexly rounded.
The surface shows fine but irregular concentric lines of growth, with occasional irregular undulations, from a little less than half the umbo-ventral diameter of the shell to about one-third of the same the more regular corrugations make their appearance, and here they are about a millimetre apart, with broad shallow interspaces. Internal edge of shell smooth and bevelled off sharp. Young examples of this species are rather more wedge-shaped posteriorly than in the adult.
Dimensions.- Type specimens, left valve, antero-posterior diameter, 54mm; umbo-ventral diameter, 41mm; depth through the one valve, 14mm; right valve, antero-posterior diameter, 55mm; umbo-ventral diameter, 37mm; depth, 12mm. The following antero-posterior and umbo-ventral diameters will serve to indicate the usual range and average variations:- 64 by 42; 61 by 43; 60 by 40; 54 by 37; 52 by 36; 31 by 21; 25 by 18; 21 by 16; 13 by 10. [details]
The surface shows fine but irregular concentric lines of growth, with occasional irregular undulations, from a little less than half the umbo-ventral diameter of the shell to about one-third of the same the more regular corrugations make their appearance, and here they are about a millimetre apart, with broad shallow interspaces. Internal edge of shell smooth and bevelled off sharp. Young examples of this species are rather more wedge-shaped posteriorly than in the adult.
Dimensions.- Type specimens, left valve, antero-posterior diameter, 54mm; umbo-ventral diameter, 41mm; depth through the one valve, 14mm; right valve, antero-posterior diameter, 55mm; umbo-ventral diameter, 37mm; depth, 12mm. The following antero-posterior and umbo-ventral diameters will serve to indicate the usual range and average variations:- 64 by 42; 61 by 43; 60 by 40; 54 by 37; 52 by 36; 31 by 21; 25 by 18; 21 by 16; 13 by 10. [details]
MolluscaBase eds. (2025). MolluscaBase. Crassatella camurus Pritchard, 1903 †. Accessed at: https://www.molluscabase.org/aphia.php?p=taxdetails&id=1722459 on 2025-09-11
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original description
Pritchard, G. B. (1903). Contributions to the palaeontology of the older Tertiary of Victoria. Lamellibranchs. Part 3. <em>Proceedings of the Royal Society of Victoria, New Series.</em> 15: 87-103., available online at https://www.biodiversitylibrary.org/page/8493564
page(s): 96-97, Pl. XIV, figs. 5-9 [details]
page(s): 96-97, Pl. XIV, figs. 5-9 [details]
From editor or global species database
Original description Shell ovate, thick and solid, of medium size, with a very short anterior, and a somewhat attenuate posterior; strong, broad, and prominent umbos medially depressed. Slightly concave anterior to the beaks, slightly to deeply concave posterior to the beaks, ventral margin very slightly convex, medial portion usually straight. Umbos strongly incurved and rather coarsely corrugated, the first 4 millimetres of the beak bearing from 8 to 10 corrugations, the umbonal region rapidly broadens and becomes depressed. Umbo-post-ventral keel only moderately developed and convexly rounded. The surface shows fine but irregular concentric lines of growth, with occasional irregular undulations, from a little less than half the umbo-ventral diameter of the shell to about one-third of the same the more regular corrugations make their appearance, and here they are about a millimetre apart, with broad shallow interspaces. Internal edge of shell smooth and bevelled off sharp. Young examples of this species are rather more wedge-shaped posteriorly than in the adult.
Dimensions.- Type specimens, left valve, antero-posterior diameter, 54mm; umbo-ventral diameter, 41mm; depth through the one valve, 14mm; right valve, antero-posterior diameter, 55mm; umbo-ventral diameter, 37mm; depth, 12mm. The following antero-posterior and umbo-ventral diameters will serve to indicate the usual range and average variations:- 64 by 42; 61 by 43; 60 by 40; 54 by 37; 52 by 36; 31 by 21; 25 by 18; 21 by 16; 13 by 10. [details]
