Crinoids from the Silurian of Western Estonia

Wenlock and Pridoli (Silurian) crinoids from Saaremaa, western Estonia (Phylum Echinodermata)

“…Unfortunately, poorly preserved plating exists around approximately one third of the Ausich et al-Wenlock and Pridoli (Silurian) crinoids from Saaremaa specimen, and the remainder of the calyx is preserved as an internal mold. This new specimen is larger (25 mm high, 20 mm wide) than the specimens reported as P. longimanus (Angelin, 1878) by Ausich et al (2012), and they also differ because the new specimen has median ray ridges, which at present is regarded a reliable species-level character among Periechocrinus species from Gotland. Franzén (1983) reported four Gotland specimens of Periechocrinus that have smooth plate sculpturing and median ray ridges (like the new specimen).…”

“…72). Geographic and stratigraphic details of Saaremaa Island localities are given in Ausich et al (2012) Remarks.-One poorly preserved crinoid calyx, assigned to P. laevis? Angelin, 1878, was collected from the Ninase Member of the Jaani Formation.…”

“…Remarks.-As discussed in Ausich et al (2012), Franzén (1983 listed three species of Eucalyptocrinites from Gotland with smooth calyx plating, basal plates not visible, and partition plates that conspicuously widen distally, including E. plebejus (Angelin, 1878), E. regularis (Hisinger, 1840), and E. rigens (Angelin, 1878 (TUG 1395-13). An interesting aspect of this species is that specimens have been heavily drilled.…”

“…Methabocrinus laevigatus (Ausich, Wilson, and Vinn, 2012) Figure 2.1, 2.2 2012 Desmidocrinus laevigatus Ausich, Wilson, and Vinn, p. 622, fig. 5G, 5H.…”

“…-Ausich et al (2012) concluded that the abundant, large rhizoid holdfasts that characterize the Kaugatuma Cliff locality belonged to Enallocrinus sp. based on comparison to Gotland specimens discussed in Donovan et al (2007 (Fig.…”