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Hiscobeccus gigas

Rhynchonellata - Rhynchonellida - Rhynchotrematidae

Lepidocyclus gigas was named by Wang (1949) [Wang might have attributed this to Billings. According to Rasmussen (2013): = 1957 Lepidocyclus perlamellosa (pars) Ross (non Whitfield, 1878), p. 477, pl. 39, figs 1–5. = Lepidocyclus capax Ross (non Conrad, 1842), p. 477, pl. 39, figs 21, 24–27. = Lepidocyclus capax; Bolton (non Conrad, 1842), pl. 3, fig. 1.]. It is a 3D body fossil.

It was recombined as Hiscobeccus gigas by Amsden (1983) and Rasmussen (2013).

Synonymy list
YearName and author
1949Lepidocyclus gigas Wang p. 16 figs. pl. 10D, figs 1-5
1983Hiscobeccus gigas Amsden p. 38
1989Lepidocyclus gigas Jin p. 65 figs. pl. 9 f. 13–22; pl. 10 f. 1–5; pl. 26 f. 4, 5
2013Hiscobeccus gigas Rasmussen pp. 368 - 369 fig. 6A–T

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phylumBrachiopodaCuvier 1805
subphylumRhynchonelliformeaWilliams et al. 1996
classRhynchonellataWilliams et al. 1996
orderRhynchonellidaKuhn 1949
superfamilyRhynchotrematoideaSchuchert 1913
familyRhynchotrematidaeSchuchert 1913
subfamilyRhynchotrematinaeSchuchert 1913

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.

C. M. O. Rasmussen 2013Medium to large, sub-circular shell, with maximum width between mid-valve and anterior third of valve length. Dorsi-biconvex, unisulcate. Ornament of simple, sub-rounded and relatively low costae, numbering to approximately 18. Dorsal fold with four costae and ventral sulcus with three costae. Entire shell lamellose. Ventral valve weakly convex with pronounced sulcus, forming truncated, tongue-like structure. Dorsal valve moderately convex with moderately elevated fold, and seven to eight costae on each side of the fold. Ventral valve possesses a high, curved palintrope which extends posteriorly as an incurved beak. Delthyrium low, wide. Dorsal beak strongly incurved and, thus, hidden in the ventral delthyrium. Seen laterally the commissural plane bends ventrally at a characteristic obtuse angle just anterior to the umbonal zone. Interiors not examined. Dorsal interior possibly with median septum.