| Basic info | Taxonomic history | Classification | Included Taxa |
| Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Pseudarchaster
Taxonomy
Pseudarchaster was named by Sladen (1889) [Sepkoski's age data: J Tith-u R]. It is extant. Its type is Pentagonaster discus. It is the type genus of Pseudarchasterinae.
It was assigned to Goniasteridae by Clark and Downey (1992); to Pseudarchasterinae by Sladen (1889), Spencer and Wright (1966) and Eagle (1999); to Valvatida by Sepkoski (2002); and to Pseudarchasteridae by Gale (2020).
It was assigned to Goniasteridae by Clark and Downey (1992); to Pseudarchasterinae by Sladen (1889), Spencer and Wright (1966) and Eagle (1999); to Valvatida by Sepkoski (2002); and to Pseudarchasteridae by Gale (2020).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 1889 | Pseudarchaster Sladen p. 109 |
| 1966 | Pseudarchaster Spencer and Wright p. U59 |
| 1992 | Pseudarchaster Clark and Downey pp. 260-261 |
| 1999 | Pseudarchaster Eagle p. 551 |
| 2002 | Pseudarchaster Sepkoski |
| 2020 | Pseudarchaster Gale p. 312 |
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.
G. Pseudarchaster Sladen 1889
show all | hide all
Pseudarchaster discus Fischer 1911
†Pseudarchaster motutaraensis Eagle 1999
†Pseudarchaster portlandicus Hess 1955
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| A. M. Clark and M.E. Downey 1992 | A genus of Goniasteridae with tabulate or even paxilliform abactinal plates, more than one row extending far out along the arm, usually reaching terminal plate; marginal plates rather broad, tapering smoothly laterally to narrowed ambital edge; one median oral spine at apex of mouth plate pair. | |
| M.K. Eagle 1999 | Abactinal plates paxilliform, in radial rows; several may extend along arm, usually more than 1 series reaching terminal plate. Unpaired median but not recurved tooth common to each pair of oral plates. Adambulacral armature comprising palmate group of furrow-spines and co-ordinate group of subambulacrals. Numerous actinal intermediate plates. Marginal plates thick, robust, paired, with fasciolar grooves between. |