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Archegonaster

Somasteroidea

Taxonomy
Archegonaster was named by Jaekel (1923) [Sepkoski's age data: O Aren-u O Llvi Sepkoski's reference number: 1075]. It is not extant. It was considered monophyletic by Dean Shackleton (2005).

It was assigned to Goniactinida by Sepkoski (2002); to Somasteroidea by Blake (2013); and to Archegonasteridae by Spencer (1951), Owen (1965), Spencer and Wright (1966), Dean Shackleton (2005) and Blake and Guensburg (2015).

Species
A. pentagonus

Synonymy list
YearName and author
1923Archegonaster Jaekel p. 344
1951Archegonaster Spencer p. 101
1965Archegonaster Owen p. 543
1966Archegonaster Spencer and Wright p. U41
2002Archegonaster Sepkoski
2005Archegonaster Dean Shackleton p. 64
2013Archegonaster Blake p. 363
2015Archegonaster Blake and Guensburg p. 477

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Deuterostomia
—Ambulacraria
RankNameAuthor
phylumEchinodermata
subphylumEleutherozoa
—Asterozoa()
classSomasteroidea()
genusArchegonaster

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. †Archegonaster Jaekel 1923
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†Archegonaster pentagonus Spencer 1951
Diagnosis
ReferenceDiagnosis
J. Dean Shackleton 2005Loss of podial basin; radial water vessel uncovered; podial floor absent; transverse contact between adjacent ambulacral ossicles overlapping; oral ambulacral perradial region ending in proximal and distal rounded tongue; adambulacrals with groove spines; adjacent inferomarginals abut; inferomarginals possess virgal-like facets; madreporite dorsal to inferomarginals; aboral surface granulated; aboral plating absent.