An extinct echinoderm class represented here by the Sandbian Macurdablastus record and a separately sourced Wuchiapingian last occurrence, rather than by an inferred extinction-boundary instant.
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The supported blastoid record used here extends from the Sandbian Macurdablastus uniplicatus to a Wuchiapingian last occurrence near 255 Ma; a Permian–Triassic boundary endpoint would be an extinction inference rather than the observed last appearance.
claim:taxon:blastoidea:sandbian-wuchiapingian-recordMacurdablastus uniplicatus is treated in the cited revision as a blastoid outside Eublastoidea, providing a source-bounded class record rather than a claim about every blastoid relationship.
claim:taxon:blastoidea:taxonomyThe displayed blastoid evidence is restricted to named Sandbian and Wuchiapingian records in its source studies and does not establish a global distribution, origin centre or extinction geography.
claim:taxon:blastoidea:biogeographyThe cited systematic and hydrospire studies do not establish a class-wide diet, habitat preference, locomotor performance, body-size distribution or guild for Blastoidea; these fields remain unresolved.
claim:taxon:blastoidea:ecologyMacurdablastus is a named blastoid with source-described morphology, and hydrospire interpretation is retained as a source-bounded functional-morphology result rather than a class-wide invariant trait.
claim:taxon:blastoidea:morphology