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Hyptiotheca

Hyolithida

Taxonomy
Hyptiotheca was named by Bengtson et al. (1990) [Bengston in Bengston et al. 1990. Sepkoski's age data: Cm Atda-u Cm Tojo Sepkoski's reference number: 923,1057]. Its type is Hyptiotheca karraculum.

It was assigned to Hyolithida by Brock and Cooper (1993), Sepkoski (2002) and Malinky and Skovsted (2004).

Synonymy list
YearName and author
1990Hyptiotheca Bengtson et al. p. 228
1993Hyptiotheca Brock and Cooper p. 776
2002Hyptiotheca Sepkoski, Jr.
2004Hyptiotheca Malinky and Skovsted p. 560

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Eutriploblastica
Neotriploblastica
Eucoelomata
RankNameAuthor
superphylumLophotrochozoa
Lophophorata
phylumHyolitha
orderHyolithidaMathew 1962
genusHyptiotheca

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
J. M. Malinky and C.B. Skovsted 2004Diagnosis.—Conchs with ovoid cross−section and ventrally
directed longitudinal curvature. Ligula semi−elliptical, at 120°
to dorsal apertural margin. Surface sculpture of distinct
growth lines and faint longitudinal striations. Opercula with
broad cardinal shield, well−defined tectula, cardinal processes
about 3 lengths of the operculum width, thickened central field
on inner surface, and no clavicles (from Bengtson 1990a).