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Petasotheca

Orthothecida

Taxonomy
Petasotheca was named by Landing and Bartowski (1996) [Sepkoski's age data: Cm Boto-u Sepkoski's reference number: 1235].

It was assigned to Orthothecida by Landing and Bartowski (1996); and to Circothecida by Sepkoski (2002).

Synonymy list
YearName and author
1996Petasotheca Landing and Bartowski p. 757
2002Petasotheca Sepkoski, Jr.

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

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
E. Landing and K.E. Bartowski 1996Diagnosis. -0rthothecids with 1) low, circular to elliptical operculum with subcentral apex and clavicles that radiate laterally and fuse to form a high dorsolateral lobe; 2) no cardinal processes; and 3) simple, conoidal conchs with round crosssection.

Description. -Low operculum with slightly elevated, subcentral apex and concentric growth lines; visceral surface depressed at growth center; ridge concentric to the ventral margin increases in height laterally, extends dorsolaterally, and supports a row of clavicles; fused clavicles form a high lobe at dorsal end of the clavicle rows; cardinal processes absent; conchs slightly curved, have round cross-sections and fine, transverse growth lines.