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Dignomia

Lingulata - Lingulida - Lingulidae

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).

Synonymy list
YearName and author
1871Dignomia Hall
2000Dignomia Williams et al. p. 78
2002Dignomia Sepkoski, Jr.
2006Dignomia Emig and Herrera

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Eutriploblastica
Neotriploblastica
Eucoelomata
superphylumLophotrochozoa
Lophophorata
RankNameAuthor
phylumBrachiopodaCuvier 1805
subphylumLinguliformeaWilliams et al. 1996
classLingulataGorjansky and Popov 1985
orderLingulidaWaagen 1885
superfamilyLinguloideaMenke 1828
familyLingulidaeGray 1840
genusDignomiaHall 1871

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
Emig and Herrera 2006Shell 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).