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Taxonomy
Chama piruensis was named by Squires (1987). Its type specimen is LACMIP 7520, a valve, and it is a 3D body fossil.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1987 | Chama piruensis Squires p. 57 figs. 104-106 |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
†Chama piruensis Squires 1987
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| R. L. Squires 1987 | Generic assignment based on spirally coiled, inflated left valve , prosogyrate , ligament external , anterior cardinal large and solid , posterior cardinal slender , long, and curved. Ornament commarginal and irregularly lamellate. Specific assignment based on strongly spirally coiled, very elongate left valve covered with irregularly spaced commarginal lamellae.
Chama piruensis new species is similar to Chama calcarata Lamarck (1806:349 ; 1809:p l. 23 , figs. 4a , b; Deshayes , 1825: 246-247 , pl. 38, figs. 5-7 ; 1860:583 ; Wood , 1871:172-173 , pl.25,figs.1a-c; Chedeville, 1901:122; Cossmann and Pissarro, 1904- 1906: pl. 20, fig. 76-5; Kennedy , Morris , and Taylor , 1970:390 , pl. 72, figs.2a, b; Pomerol and Feugueur , 1974:pl. 8, fig.4) from middle and upper Eocene strata (Lutetian and Bartonian stages) of the Anglo-Paris Basin. Chama piruensis differs from several examined left valves of C. calcarata in the following features: less inflated middle portion of the valve, more irregularly spaced commarginal lamellae , and absence of radial ribs. In addition, C. piruensis shows no tendency for development of spines on the comma rginal lamellae along margins of the left valve. The lack of such spines on C. piruensis, however , may be due to poor preservation. Presence of such spines is not a constant feature of C. calcarata, based on an examination of specimens from th e Los Angeles County Museum collection. |
Measurements
No measurements are available
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| Source: g = genus, c = class | |||||
| Reference: Aberhan et al. 2004 | |||||