TABLE 3 in New Eocene species of the crinoid genera Holopus and Cyathidium (Cyrtocrinida: Holopodidae) from north-eastern Italy

TABLE 3. Main qualitative characters differentiating Cyathidium and Holopus modified from Roux et al. (2021).
CharactersCyathidiumHolopusClosed crownOuter convexityWeak to moderateStrongly markedNumber of IIBr visible1, rarely 2usually more than 3Maximum diameterRadial or Ibrax circletIIBr1–3 circletMaximum Ibrax widthProximal facet (Wp)Distal third (Wd)H/Wd of Ibrax<0.7>0.7IBrax shapeSubtrapezoidal, very angleobtuse distalSubpentagonal, marked distal angleIIBr1 shapeTrapezoidal to triangularSubrectangularAboral cupConstriction of radial ringVariable or absentUsually markedGrowth rings on external surfaceUsually conspicuousUsually absentOuter interradial process on adoral faceSmall but usually presentAbsent or inconspicuous