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Holmitheca

Orthothecida - Tetrathecidae

Taxonomy
Holmitheca is a genus. It is not extant.

It was assigned to Tetrathecidae by Kruse (2002); and to Exilithecida by Sepkoski (2002).

Synonymy list
YearName and author
2002Holmitheca Kruse p. 369
2002Holmitheca Sepkoski, Jr.

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Eutriploblastica
Neotriploblastica
Eucoelomata
superphylumLophotrochozoa
RankNameAuthor
Lophophorata
phylumHyolitha
orderOrthothecida
familyTetrathecidaeSysoyev 1968
genusHolmitheca

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
P. D. Kruse 2002Conch transverse section trapezoidal, dorsum with two keels separating median and two lateral facets and with median facet planar to convex, venter concave; external sculpture absent on dorsum, absent or of transverse rugae or venter