Fig. 4 in Crinoid ancestry without blastozoans

Fig. 4. Oral/tegmenal regions of Tremadoc, Early Ordovician, crinoids from Utah, USA. A. Protocrinoid Titanocrinus sp. (PE 52723), anterior view, well preserved partial crown with tall conical tegmen, terminating in anal cone (A1); portion of tegmen with interbrachi- al-like platelets extending to tertibrachial (A2). B, C. Protocrinoid Titanocrinus sumralli Guensburg and Sprinkle, 2003. B. PE 52721, C, D ray platelets in web above axial, immersed (B1); weathered tegmen section, tegmen platelets close above fixed C ray plates, no cover plates or axial morphology (B2). C. PE 52724, weathered tegmen section showing platelets. D. Protocrinoid Glenocrinus globularis Guensburg and Sprinkle, 2003 (PE 52733), posterior view, tegmen with anal cone similar to Titanocrinus. E. Eknomocrinus wahwahen- sis Guensburg and Sprinkle, 2003 (PE 52734), largely unexposed oral surface, anal cone in posterior interray at right.