Swiss Journal of Palaeontology

Table 4 Morphologic characters of pirasocrinid genera

From: Mississippian–Permian evolution and paleogeographic distribution of the Cromyocrinidae and Pirasocrinidae (Crinoidea, Dendrocrinida)

Pirasocrinid genera	Crown long cylinder	Crown short cylinder	Crown pear	Crown mushroom	Cup only	Tegmen long	Tegmen short	Cap polegonal plates	Spine ring	Cup discoid/saucer	Cup low bow	Cup med bowl	Basal concavity shallow	Bbasal concavity medium	Basal concavity deep
Hypermorphocrinus	X					X		X	X	X			X	X
Separocrinus		X									X		X
Simocrinus					X					X			X
Perimestocrinus		X					X	X	X		X		X
Aatocrinus					X					X				X
Triceracrinus		X					?				X			X
Retusocrinus					X						X		X
Vertigocrinus					X						X			X
Polygonocrinus		X					X	X	X		X				X
Metaperimestocrinus		X				X		X	X		X	X	X
Eirmocrinus			X			X		X	X	X					X
Pirasocrinus	X					X			X		X				X
Psilocrinus					X						X		X
Schedexocrinus	X			X		X		X	X		X		X
Metaffinocrinus					X						X		X
Platyfundocrinus					X					X					X
Stenopecrinus	X					X		X	X		X				X
Affinocrinus					X						X				X
Exterocrinus					X							X		X
Lasanocrinus					X						X		X	X
Metutharocrinus					X						X			X
Utharocrinus					X					X
Zeusocrinus		X		X			X	X	X		X			X
Dasiocrinus	X					X		X	X	X	X			X
Plaxocrinus	X							X	X		X	X	X

Pirasocrinid genera	Cup —	Cup –o	Cup –+	Cup plates not inflated	Cup plates inflated, tumid	Cup plates very bulbous	Sutures impressed	Radial gape	Radial notches narrow	Radial notches wide	Radial nodes	Radial spines	Basal nodes
Hypermorphocrinus		X		X					X
Separocrinus			X		X					X
Simocrinus		X		X
Perimestocrinus			X				X		X
Aatocrinus	X				X		X		X
Triceracrinus			X				X	X	X		X		X
Retusocrinus		X			X		X			X
Vertigocrinus		X			X		X		X
Polygonocrinus			X		X		X
Metaperimestocrinus			X	X			X
Eirmocrinus	X					X	X						X
Pirasocrinus	X					X	X	X			X
Psilocrinus			X	X			X		X
Schedexocrinus		X				X	X	X	X		X
Metaffinocrinus		X			X		X		X
Platyfundocrinus		X		X					X
Stenopecrinus		X			X		X	X	X
Affinocrinus	X				X		X		X
Exterocrinus			X		X		X		X
Lasanocrinus		X			X				X		X	X
Metutharocrinus		X									X	X
Utharocrinus			X				X			X	X		X
Zeusocrinus			X
Dasiocrinus			X				X	X
Plaxocrinus			X		X			X	X

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