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Leionucula punjabensis

Bivalvia - Protobranchia - Nuculidae

Taxonomy
Leionucula punjabensis was named by Eames (1951) [DISTRIBUTION: Eocene; Pakistan.]. Its type specimen is L. 79832, 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.

Synonymy list
YearName and author
1951Leionucula punjabensis Eames pp. 320-321 figs. pl. 9, figs. 7a, b

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Protostomia
Spiralia
superphylumLophotrochozoa
phylumMollusca
classBivalvia
RankNameAuthor
orderProtobranchiaPelseneer 1889
superorderNuculiformiiDall 1889
orderNuculida(Dall 1889)
superfamilyNuculoidea(Gray 1824)
familyNuculidaeGray 1824
genusLeionuculaLamarck 1799
speciespunjabensis

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.

Diagnosis
ReferenceDiagnosis
F. E. Eames 1951Shell moderately large, thin-shelled, subtriangular in outline, not very
high, moderately elongate. Umbos not high, not very pointed, situated posterior to the
median line at about one-third of the length. Antero-dorsal margin long, only slightly
convex, the convexity most pronounced along the median portion of the lunule, moderately descendent. Anterior end narrowly rounded. Ventral margin moderately strongly convex, the posterior end not appreciably more steeply descendent than the anterior end. Posterior end bluntly rounded, subangular. Postero-dorsal margin practically straight, of moderate length, moderately steeply descendent. Surface smooth except for microscopic incremental~. Valve margins ventrally smooth internally. Lunule broadly lanceolate, slightly sunk as a whole, its outer margin limited by a blunt, rounded ridge which merges with the lateral surface of the shell, its median portion distinctly swollen. Escutcheon rather narrowly cordiform, ill-defined except near the urnbos.