The lower Carboniferous blastoid
Astrocrinus tetragonus
(Austin and Austin), from Grassington, Yorkshire, and the validity of
Astrocrinus benniei
(Etheridge)
Abstract:Despite surviving longer than any other blastozoans, blastoids were exceptionally conservative in their morphology and usually symmetrically pentaradiate. Astrocrinus is a rare exception that lacked a stem and some thecal plates, although differing interpretations of its morphology and taxonomy have been published. Astrocrinus had a flattened, tetralobate theca covered in minute spines, and with a plane of symmetry through the AB interray and the D ray. Four ambulacra are long, thin, and curved down deep sinus… Show more
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