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Taxonomy
Lingulella chengjiangensis was named by Jin et al. (1993). Its type specimen is NIGP 101597, 113919, a shell, and it is not a trace fossil. Its type locality is Maotianshan, Bed 4 [Yuanshan Fm], which is in an Atdabanian marine shale in the Yuanshan Formation of China. It is the type species of Eoglossa.
It was recombined as Eoglossa chengjiangensis by Wang et al. (2014).
It was recombined as Eoglossa chengjiangensis by Wang et al. (2014).
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1912 | Obolus chinensis Walcott and Mansuy p. 20 figs. pl. 1, fig. 4 |
| 1993 | Lingulella chengjiangensis Jin et al. p. 795 figs. figs. 3.1-3.5 |
| 2014 | Eoglossa chengjiangensis Wang et al. |
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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.
†Eoglossa chengjiangensis Jin et al. 1993
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Invalid names: Obolus chinensis Walcott and Mansuy 1912 [synonym]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| Y. G. Jin et al. 1993 | Shell small, up to 8.2 mm long, triangular in outline, maximum width near anterior margin; protegulum circular in outline; dense, fine growth lines grouped into strong bands. | |
| H. Wang et al. 2014 | Shell elongate oval, thin, weakly biconvex, subequivalved, ventral valve typically subacuminate; external shell with growth lines only; ventral pseudointerarea with narrow subtriangular groove, propareas without flexure lines; dorsal posterior margin weakly thickened, but lacking pseudointerarea; visceral area of both valves slightly thickened; ventral visceral area not extending to mid-valve; dorsal visceral area with anterior tongue projection extending to mid-valve; lophophore simple spiral; one pair of posterolateral muscles, one umbonal muscle in both valves; ventral and dorsal vascula lateralia placed peripherally, slightly converging; dorsal vascula media short, bifurcate, located at the anterior of tongue; pedicle robust with a coelomic cavity, annulations on the exterior surface. |