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Stibaraster
Taxonomy
Stibaraster was named by Blake and Guensburg (1993) [Sepkoski's age data: O Llvi]. It is not extant. Its type is Stibaraster ratcliffei.
It was assigned to Uractinina by Blake and Guensburg (1993); to Uractinida by Sepkoski (2002); to Asteroidea by Dean Shackleton (2005); to Urasterellidae by Blake and Rozhnov (2007); and to Palasterinidae by Blake (2018).
It was assigned to Uractinina by Blake and Guensburg (1993); to Uractinida by Sepkoski (2002); to Asteroidea by Dean Shackleton (2005); to Urasterellidae by Blake and Rozhnov (2007); and to Palasterinidae by Blake (2018).
Species
S. ratcliffei (type species)
Synonymy list
Year | Name and author |
---|---|
1993 | Stibaraster Blake and Guensburg p. 110 |
2002 | Stibaraster Sepkoski |
2005 | Stibaraster Dean Shackleton p. 94 |
2007 | Stiberaster Blake and Rozhnov p. 524 |
2018 | Stibaraster Blake p. 29 |
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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.
G. †Stibaraster Blake and Guensburg 1993
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†Stibaraster ratcliffei Blake and Guensburg 1993
Diagnosis
Reference | Diagnosis | |
---|---|---|
D. B. Blake and T. E. Guensburg 1993 | Five-armed, stoutly constructed asteroid; aboral numerous, small, stout, closely abutted; marginals in one row; proximal marginals much larger than aborals, vertically elongate, becoming similar in size, longitudinally elongate distally; marginals eaqual in number to adambulacrals proximally, more numerous distally; unpaired interbrachial marginal (i.e. axillary) abuts oral ossicular pair; adambulacral stout, broad, with flat outer face, spine base small, of equal size, ossicular furrow margin angular; ambulacral massive, with prominent transverse ridge separating broad podial basins; podial pores lacking; lateral articular facets in ridge-and-groove arrangements, these well developed on ambulacrals, adambulacrals; oral ossicles relatively small. |