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Pentrimites robustus, blastoidSide view of a specimen from the Carboniferous (Mississipian), Illinois, USA - length 4 cm. Blastoids are extinct marine invertabrates belonging to the Phylum Echinodermata
Deltoblastus, a fossil blastoidDeltoblastus, 1.5 cm in diameter, from the Permian of Timor. side view
Pentremites spicatus, blastoidA Carboniferous blastoid from Grayson Co, Kentucky, U.S.A