|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Crinoidea - Cladida - Petalocrinidae
Misspelled as "Spriocrinus"
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.
|A. T. Mu and Y. R. Wu 1974||Horseshoe-shaped articular facets, fused brachials cylindrical and tapered
at both ends, as many as 10-12 distal ambulacra, adjacent arms not in lateral contact,
ambulacral grooves spiraled around fused arm with left-hand spiral