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Morphology Ecology and taphonomy   Age range and collections

Circothecidae

Orthothecida - Circothecidae

Synonyms
Synonymy list
YearName and author
1969Circothecidae Rozanov et al.
1983Circothecidae Azmi and Pancholi p. 367
1990Larawidae Kruse p. 42
2002Circothecidae Kruse p. 365
2010Circothecidae Parkhaev and Demidenko p. 931

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Eutriploblastica
Neotriploblastica
Eucoelomata
superphylumLophotrochozoa
RankNameAuthor
Lophophorata
phylumHyolitha
orderOrthothecida
familyCircothecidae
familyCircothecidae

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 2002 (Larawidae)Conch straight, may be slightly curved near apex; transverse section circular, oval, elliptical or oviform; sculpture of transverse growth lines, in some cases with longitudinal sculpture; dorsum and venter poorly differentiated, dorsoventral transition smooth
P. Y. Parkhaev and Y. Demidenko 2010"Shell elongated with circular or slightly oval cross-section, straight or slightly bent. Differentiation of dorsal and ventral sides absent (in shells with circular cross-section) or faint (in shells with oval cross-section), in latter case dorsal side more convex. Shell ornamented by transversal ribs of similar prominence along shell perimeter."