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Dignomia
Taxonomy
Dignomia was named by Hall (1871) [Sepkoski's age data: D m Sepkoski's reference number: 1]. Its type is Lingula alveata.
It was assigned to Linguloidea by Williams et al. (2000); to Lingulida by Sepkoski (2002); and to Lingulidae by Emig and Herrera (2006).
It was assigned to Linguloidea by Williams et al. (2000); to Lingulida by Sepkoski (2002); and to Lingulidae by Emig and Herrera (2006).
Synonymy list
| Year | Name and author |
|---|---|
| 1871 | Dignomia Hall |
| 2000 | Dignomia Williams et al. p. 78 |
| 2002 | Dignomia Sepkoski |
| 2006 | Dignomia Emig and Herrera |
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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.
G. †Dignomia Hall 1871
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†Dignomia alveata Hall 1863
†Dignomia lepta Clarke 1912
†Dignomia munsterii d’Orbigny 1842
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Invalid names: Dignomia boliviana Gagnier et al. 1996 [synonym], Lingula lineata Hoek in Streinman & Hoek 1912 [synonym]
†Dignomia subalveata Kayser 1897
†Dignomia submarginata d’Orbigny 1842
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Invalid names: Lingula marginata d’Orbigny 1842 [replaced]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| Emig and Herrera 2006 | Shell thin, elongate oval in shape; externally, two diverging medio-lateral grooves (internally ridges) extend from the umbonal region to the anterior margin, and a narrow median groove (a septum internally) extends from the umbonal region to the anterior margin of the dorsal valve but in the ventral valve only over the anterior half of the shell. Asymmetrical muscle system with three internal oblique muscles; unpaired posterior adductor muscle; no vascula media observed. (Note: these three characters are prerequisite to a diagnosis of the family Lingulidae – see Emig 2003). |