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Arkonaster
Taxonomy
Arkonaster was named by Kesling (1982) [Sepkoski's age data: D Give]. It is not extant. Its type is Arkonaster topororum.
It was assigned to Arkonasteridae by Kesling (1982); to Asteroidea by Sepkoski (2002); and to Helianthasteridae by Blake (2009) and Blake (2018).
It was assigned to Arkonasteridae by Kesling (1982); to Asteroidea by Sepkoski (2002); and to Helianthasteridae by Blake (2009) and Blake (2018).
Species
A. topororum (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 | |
|---|---|---|
| R. V. Kesling 1982 | As for the family, by monotypy. | |
| D. B. Blake 2009 | Twenty-eight-armed helianthasterid. Primary ossicles of dorsal skeleton apparently limited to comparatively robust, disklike, spine-bearing carinal series. Adambulacrals bearing series of three spines. Circumoral longer than next ambulacral. Pedicellariae of two distinct size classes, valves three. MAO spines not recognized. |