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Taxonomy
Nucula (Lamellinucula) costacallistiformis was named by Eames (1951) [DISTRIBUTION: Eocene; Pakistan.]. Its type specimen is L. 79799, a shell, and it is not a trace fossil. Its type locality is Fossil Bed F.2680, Zinda Pir, which is in a Ypresian marine shale in the Ghazij Formation of Pakistan.
Sister species lacking formal opinion data
N. angusta, N. calliope, N. cipleyensis, N. ciplyensis, N. cochlear, N. dasa, N. defuniak, N. dixoni, N. fritschi, N. guillermensis, N. indica, N. meadinga, N. microconcentrica, N. otamatea, N. percrassa, N. potomacensis, N. praelongata, N. pulchra, N. rivulana, N. sagittata, N. stachei, N. subtrigona, N. silicea, N. mametschinskensis, N. planata, N. aptera, N. waiaotea, N. waiotea, N. eudorae
Synonymy list
| Year | Name and author |
|---|---|
| 1951 | Nucula (Lamellinucula) costacallistiformis Eames p. 317 figs. pl. 9, figs. 3a, b |
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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.
†Nucula (Lamellinucula) costacallistiformis Eames 1951
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| F. E. Eames 1951 | DESCRIPTION.Shell small, suboval, having the form of a small Costacallista, moderately
inflated. Prodissoconch not distinctly seen, apparently moderately large and smooth; this appearance may, however, be due to wear of the umbonal region. Young forms tend to be less transverse. Umbos not large, not prominent, situated posterior to the median line at about five-seventeenths of the length. Antero-dorsal margin moderately long, slightly convex, gently descendent. Anterior end rather narrowly rounded. Ventral margin distinctly convex. Posterior end broadly rounded with a slight indication of angularity. Postero-dorsal margin almost straight, slightly convex, moderately short, rather steeply descendent. Ornament consisting of distinct concentric threads or fine lamellae of about the same width as or slightly wider than their intervals; there are about 19 of them on the holotype between the ventral margin and the smooth umbonal region, and about 10 to the mm. ventrally. Internal ventral margin of valves finely crenulated. Using high magnification the concentric lamellae appear to be vaguely frilled ventrally, and a very fine radial shell structure is seen. Lunule not well preserved, long and lanceolate, with the hinge teeth showing through. Escutcheon similarly ill-preserved, appearing rather small and cordiform. |