Enallocrinus sp.

Ausich, William I., Wilson, Mark A. & Vinn, Olev, 2012, Crinoids from the Silurian of Western Estonia, Acta Palaeontologica Polonica 57 (3), pp. 613-631 : 624

Enallocrinus sp.

Fig. 6B, C .

Material.—The best examples of this holdfast remain in situ at Kaugatuma Cliff. Specimens deposited in a museum include TUG 1395−38 and TUG 1395−39.

Discussion.— Donovan et al. (2007) identified a distinctive Gotland crinoid holdfast as “probably Enallocrinus ” ( Donovan et al. 2007: fig. 1). We follow this identification, herein. Measurements.—TUG 1395−1, holotype: calyx height, 9.2; calyx width, 15.1; basal circlet width, 1.4; radial plate height, 3.8; radial plate width, 5.3; first primibrachial height, 2.2; first primibrachial width, 3.1; primanal height, 4.7; primanal width, 4.7.

Geographic and stratigraphic range.—This new species is only known from the middle Äigu Beds, Kaugatuma Formation (Pridoli) at Kaugatuma Cliff, Saaremaa Island.

Figures

Fig. 6. Crinoids from the Silurian of Estonia, middle Äigu Beds, Kaugatuma Formation (Pridoli, Silurian), Kaugatuma Cliff. A. Cladida indet., TUG 1395−9, lateral view of badly disarticulated calyx. B. Enallocrinus sp. holdfast, TUG 1395−39, column of Enallocrinus holdfasts lacking the rhizoids. C. Field photograph of an uncollected in situ Enallocrinus holdfast. Note wide, pentalobate lumen and long radices of holdfast. Scale bars 10 mm.