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Hyptiotheca karraculum

Hyolithida

Taxonomy
Hyptiotheca karraculum was named by Bengtson et al. (1990) [Bengston in Bengston et al. 1990]. Its type specimen is SAMP 30902 and is not a trace fossil. It is the type species of Hyptiotheca.

Synonymy list
YearName and author
1990Hyptiotheca karraculum Bengtson et al. pp. 228-229 figs. 11.13-11.15
2001Hyptiotheca karraculum Gravestock et al. p. 102 figs. Pl. X, figs. 3-6
2004Hyptiotheca karraculum Malinky and Skovsted p. 560 figs. 4E–I, 6A, B.

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Protostomia
Spiralia
superphylumLophotrochozoa
RankNameAuthor
Lophophorata
phylumHyolitha
orderHyolithidaMathew 1962
genusHyptiotheca
specieskarraculum

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.

Hyptiotheca karraculum Bengtson et al. 1990
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Diagnosis
ReferenceDiagnosis
J. M. Malinky and C.B. Skovsted 2004Operculum of generally elliptical shape with conical shield only slightly more curved than cardinal shield along the edge; conical shield gently curved with low profile grading into indistinct summit; furrows and rooflets well defined though furrows shallow; cardinal shield may intersect conical shield at angle of about 20°, or it may grade smoothlywithout any change in angle into cardinal shield, such that operculum when viewed from lateral edge has profile of gently curving line; surface of operculum with widely spaced concentric grooves.

Interior of operculum has thickened central region that has a distinct sharp boundary with edge of the operculum; shallow depressions that mark the sites of the rooflets on the exterior may be present only along the edges of the operculum in the thinner region, or they may be present only in the thicker region, or they may be lacking entirely; interior of operculum smooth and apparently lacking any evidence of clavicles.