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Hyptiotheca
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).
It was assigned to Hyolithida by Brock and Cooper (1993), Sepkoski (2002) and Malinky and Skovsted (2004).
Species
H. karraculum (type species)
Synonymy list
| Year | Name and author |
|---|---|
| 1990 | Hyptiotheca Bengtson et al. p. 228 |
| 1993 | Hyptiotheca Brock and Cooper p. 776 |
| 2002 | Hyptiotheca Sepkoski |
| 2004 | Hyptiotheca Malinky and Skovsted p. 560 |
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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.
G. †Hyptiotheca Bengtson et al. 1990
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†Hyptiotheca karraculum Bengtson et al. 1990
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. M. Malinky and C.B. Skovsted 2004 | Diagnosis.—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). |