|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||Age range and collections|
Lingulata - Lingulida - Lingulidae
It was assigned to Lingulida by Sepkoski (2002); to Lingulidae by Williams et al. (2000) and Emig and Bitner (2005); and to Glottidiinae by Peng and Shi (2008).
|C. C. Emig and M. A. Bitner 2005||Shell strongly elongate in outline, lateral margins subparallel to parallel, anterior margin slightly rounded to nearly straight. Mantle canal system with papillae; main canals (vascula lateralia) in both dorsal and ventral valves terminating at the same level. Ventral valve with a pedicle groove, the edges of which are triangular or subparallel, and with lateral vestigial propareas; two divergent septa, serving as sites for the attachment of the internal oblique muscles and as support for the perimial line of the body wall; pedicle nerve curving around an unpaired posterior adductor muscle; ventral lophophoral cavity extending anteriorly to occupy 33–43 per cent of the length of the valve. Dorsal valve with a median septum extending from the posterior adductor muscle anteriorly to the composite ‘lateral + internal oblique’ muscles; posterior margin rounded, with a median beak; anterior oblique muscles closely spaced, sometimes bisected by a median septum; dorsal lophophoral cavity extending anteriorly to occupy 19–33 per cent of the valve length.|