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Hystrixasterias
Taxonomy
Hystrixasterias was named by Blake (1990). It is not extant. Its type is Hystrixasterias hettangiurnus.
It was assigned to Asteriidae by Blake (1990); and to Forcipulatida by Sepkoski (2002).
It was assigned to Asteriidae by Blake (1990); and to Forcipulatida by Sepkoski (2002).
Species
H. hettangiurnus (type species)
Synonymy list
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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.
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| D. B. Blake 1990 | Asteriid with body wall ossicular series consisting of carinals bordered on each side by one row of small laterals and two of larger laterals; then two marginal rows and three actinal rows on disk, two on arms. Ossicles of various series transitional in morphology. Abactinals arranged in regular transverse and longitudinal rows. Ambulacra moderetly compressed, podial pores quadriserial; first 3 adambulacral pairs forming adoral carina, adambulacrals with transverse series of four prominent spines; large uncrossed clam-shaped pedicellariae present on dorsal surface only. |
Measurements
No measurements are available
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| Source: o = order, c = class, p = phylum | |||||
| References: Aberhan et al. 2004, Aberhan 1992 | |||||
Age range: Late/Upper Hettangian or 201.40000 to 199.50000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Hettangian | Germany (Württemberg) | H. hettangiurnus (59868) |