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Eoglossa chengjiangensis

Lingulata - Lingulida - Obolidae

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).

Synonyms
Synonymy list
YearName and author
1912Obolus chinensis Walcott and Mansuy p. 20 figs. pl. 1, fig. 4
1993Lingulella chengjiangensis Jin et al. p. 795 figs. figs. 3.1-3.5
2014Eoglossa chengjiangensis Wang et al.

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Eutriploblastica
Neotriploblastica
Eucoelomata
superphylumLophotrochozoa
Lophophorata
phylumBrachiopodaCuvier 1805
RankNameAuthor
subphylumLinguliformeaWilliams et al. 1996
classLingulataGorjansky and Popov 1985
orderLingulidaWaagen 1885
superfamilyLinguloideaMenke 1828
familyObolidaeKing 1846
subfamilyGlossellinae
genusEoglossa
specieschengjiangensis()

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
Y. G. Jin et al. 1993Shell 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. 2014Shell 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.