|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||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).
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. 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.|