| Basic info | Taxonomic history | Classification | Included Taxa |
| Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Sphaerasteridae
Taxonomy
Sphaerasteridae was named by Schöndorf (1906). It is not extant.
It was assigned to Tumulosina by Spencer and Wright (1966); and to Valvatida by Blake (1989), Villier (2010) and Gale (2021).
It was assigned to Tumulosina by Spencer and Wright (1966); and to Valvatida by Blake (1989), Villier (2010) and Gale (2021).
Synonymy list
| Year | Name and author |
|---|---|
| 1906 | Sphaerasteridae Schöndorf p. 256 |
| 1966 | Sphaerasteridae Spencer and Wright p. 55 |
| 1989 | Sphaerasteridae Blake p. 213 |
| 2010 | Sphaerasteridae Villier p. 714 |
| 2021 | Sphaerasteridae Gale p. 702 |
Is something missing? Join the Paleobiology Database and enter the data
|
|
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.
Fm. †Sphaerasteridae Schöndorf 1906
show all | hide all
G. †Sphaeraster Quenstedt 1876
hide
†Sphaeraster tabulatus Goldfuss 1833
+
Invalid names: Asterias annulosa Quenstedt 1876 [synonym], Sphaeraster punctatus Quenstedt 1852 [synonym], Sphaerites juvenis Quenstedt 1852 [synonym]
Invalid names: Sphaerites Quenstedt 1852 [replaced]
G. †Valettaster Lambert 1914
hide
†Valettaster argus Spencer 1907
†Valettaster dangeardi Mercier 1935
†Valettaster digitatus Quenstedt 1858
†Valettaster granulatus Brünnich-Nielsen 1943
†Valettaster ocellatus Forbes 1848
†Valettaster planus Loba and Radwańska 2022
†Valettaster stipes Villier 2010
†Valettaster thuyi Gale 2021
Invalid names: Tholaster Spencer 1913 [replaced]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| A.S. Gale 2021 | A group of asteroids with spherical to subspherical body form, in which the abactinal surface is strongly domed and made up of relatively few, large, polygonal abactinal and actinal ossicles. Marginals are not differentiated. Primary (extra-ambulacral groove)
ossicles are tabular to sub-conical in form. Adambulacral-ambulacral articulations and inter-adambulacral contacts have cavities for probable attachment of ligaments. The primary ossicles are made up of three discrete stereom layers: an external one of dense perforate stereom, a middle one of rectilinear stereom and an internal one of labyrinthic material. |