FIGURE 4. Holopus alidis. A in New Eocene species of the crinoid genera Holopus and Cyathidium (Cyrtocrinida: Holopodidae) from north-eastern Italy

FIGURE 4. Holopus alidis. A: lateral distal view of paratype 4 without its arms (MNHN-IE-2013-10012); B: lateral distal view of a juvenile specimen with closed crown (MNHN-IE-2014-2185), C: close-up of IBrax of B; D: lateral oblique view of rolled arm attached to IBrax (arrow heads: keystone plates (IIBr4) of the two arms of the same ray) (MNHN-IE-2013-10012), E: pinnule socket on IIBr1 of Fig. 5B (adoral part at bottom with two small muscular pits); p: interradial process, r: thin radial ridge. Scale bars: 0.5 mm in E, 1.0 mm in all others.