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Hyptiotheca karraculum
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
| Year | Name and author |
|---|---|
| 1990 | Hyptiotheca karraculum Bengtson et al. pp. 228-229 figs. 11.13-11.15 |
| 2001 | Hyptiotheca karraculum Gravestock et al. p. 102 figs. Pl. X, figs. 3-6 |
| 2004 | Hyptiotheca karraculum Malinky and Skovsted p. 560 figs. 4E–I, 6A, B. |
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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.
†Hyptiotheca karraculum Bengtson et al. 1990
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. M. Malinky and C.B. Skovsted 2004 | Operculum 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. |
Measurements
No measurements are available
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| Source: o = order, p = phylum | |||||
| References: Hendy et al. 2009, Kiessling 2004 | |||||
Age range: base of the Atdabanian to the top of the Dyeran or 521.00000 to 511.20000 Ma
Collections (36 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Atdabanian | Australia (South Australia) | Hyptiotheca karraculum (96454 96920 96966 97739 97740 97741 97742 97747 97749 97750) | |
| Atdabanian - Botomian | Antarctica (South Shetland Islands) | Hyptiotheca karraculum (49691) | |
| Botomian | Australia (South Australia) | Hyptiotheca karraculum (50793 96914 96916 96917 96932 96958 96959 96965 97717 97751 97770 97771 97773 97774 97775) | |
| Dyeran | Greenland | Hyptiotheca karraculum (49461 49464) | |
| Toyonian | Australia (South Australia) | Hyptiotheca karraculum (64451 64459 64460 64461 64462 64465 64466 96929) |