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Strophomena dignata
Taxonomy
Strophomena dignata was named by Fenton (1928) [Fenton notes that this might be a variant of Strophomena musculosa, which is now Tetraphalerella musculosa.]. Its type specimen is Walker Mus. 25532 and is a 3D body fossil. Its type locality is 2.5 miles west of St. Genevieve, Weingarten, which is in a Chatfieldian carbonate shale/limestone in the Barnhart Formation of Missouri.
Sister species lacking formal opinion data
Synonymy list
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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.
†Strophomena dignata Fenton 1928
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| C. Fenton 1928 | Shell medium to large. Dimensions of the allotype: length of pedicle valve, 25.7 mm.; length of brachial valve, 24.9 mm.; width 36.2 mm.; thickness 9.2 mm.; height of cardinal area 2.6 mm.
Pedicle valve convex umbonally, strongly concave medially, and reversed on the extremities. These are produced and moderately crenulate. Anterior margin nasute. Cardinal area flat; delthyrium wide, deltidium highly convex. Intra- marginal ridge low and rounded, and crossed by fine vascular canals. The muscular area is elongate flabelliform, with high, sharp boundaries and sharp, radiating ridges on the diductor scars. Adductor scars linear, situated on a low elevation which expands posteriorly but fails to reach the umbonal region. Teeth strong and high; genital area pustulose. Brachial valve flattened umbonally, strongly convex medially, reversed on the moderately wrinkled extremities. Internal characters not known. Surface marked by irregularly alternating costae, from 3 to 5 fine ones to each coarse. The concentric wrinkles are fainter than in S. musculosa. |