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Cyphomenoidea bella
Taxonomy
Leptaena bella was named by Williams (1951). Its type specimen is SM. A30109, a valve (dorsal valve), and it is a 3D body fossil. Its type locality is Bench Mark 1141-5 on mountain road south of Cwm-eoed-aeron, which is in an Aeronian carbonate mudstone in the Trefawr Formation of the United Kingdom.
It was recombined as Kulumbella bella by Rubel (1970); it was recombined as Pentlandina bella by Cocks (1978); it was recombined as Glossoleptaena bella by Temple (1987); it was recombined as Cyphomenoidea bella by Jin and Copper (1998).
It was recombined as Kulumbella bella by Rubel (1970); it was recombined as Pentlandina bella by Cocks (1978); it was recombined as Glossoleptaena bella by Temple (1987); it was recombined as Cyphomenoidea bella by Jin and Copper (1998).
Synonymy list
| Year | Name and author |
|---|---|
| 1951 | Leptaena bella Williams p. 119 figs. Pl. VII, figs. 14, 15 |
| 1970 | Kulumbella bella Rubel |
| 1978 | Pentlandina bella Cocks |
| 1987 | Glossoleptaena bella Temple |
| 1998 | Cyphomenoidea bella Jin and Copper p. 444 |
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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.
†Cyphomenoidea bella Williams 1951
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| A. Williams 1951 | Quadrate, emarginate, the antero-lateral corners projecting ventrally and the central portion of the anterior margin projecting dorsally, gentle concavo-convex, ribbing finely parvicostellate, with a prominent median primary, rugae orientated in two directions, the stronger set running across the shell in slightly curved arcs convex towards the anterior, the weaker set at right angles running in curved arcs, convex laterally and especially conspicuous antero-laterally. 1No interiors are preserved.
The intersection of two sets of rugae at right angles is probably the early stage in the development of the peculiar patterns of such forms as Leptaena wisgoriensis Lamont and L. julia Twenhofel (1928, p. 184, pl. xxii, figs. 1 and 2). From these, however, the new species differs in the emarginate anterior margin, and in its small size. |