Calliocrinus sedgwickianus Angelin, 1878

Ausich, William I., Wilson, Mark A. & Vinn, Olev, 2012, Crinoids from the Silurian of Western Estonia, Acta Palaeontologica Polonica 57 (3), pp. 613-631 : 622

Calliocrinus sedgwickianus Angelin, 1878

Fig. 3B .

1878 Callicrinus sedgwickianus sp. nov. [sic.]; Angelin 1878: 15, pl. 1: 5.

1943 Calliocrinus sedgwickianus Angelin, 1878 ; Bassler and Moodey 1943: 349.

2003 Callicrinus sedgwickianus Angelin, 1878 ; Webster 2003.

Material.—A single specimen (TUG 1395−8) is known from Estonia.

Discussion.—Only the proximal portion of one specimen of Calliocrinus sedgwickianus Angelin, 1878 is recognized from Estonia. However, this specimen had long, robust spines (now broken) projecting outward from both the basal and radial plates ( Fig. 3B ). This resulted in a distinctive pattern that characterizes only a few species of this genus. Although this specimen is heavily bored with Oichnus Bromley, 1981 , it is evident that a single ridge projects from the base of the basal plates toward the column attachment, which is characteristic of C. sedgwickianus (see Angelin 1878: pl. 1: 3).

Geographic and stratigraphic range.—This taxon was identified from the Middle Äigu Beds, Kaugatuma Formation at Kaugatuma Cliff, Saaremaa, Estonia.

Figures

Fig. 3. Camerate crinoids from the Silurian of Estonia. A, B. Middle Äigu Beds, Kaugatuma Formation (Pridoli), Kaugatuma Cliff. A. Eucalyptocrinites tumidus sp. nov., GIT 405−243. A1, lateral view of crown, note modestly expanding partition plates; A2, basal view of calyx, note nodose calyx plates; A3, tegmen view of crown, note flat tegmen top. B. Calliocrinus sedgwickianus sp. nov., TUG 1395−8. Basal view of a portion of the basal and radial circlets, all circular pits are the trace fossil Oichnus. C. Eucalyptocrinites sp., GIT 405−238, Jaani Formation (Wenlock), Suuriku Cliff. Lateral view of calyx. D. Eucalyptocrinites sp. 2., TUG 1395−13, Ninase Member, Jaani Formation (Wenlock), Panga Cliff. D1, tegmen view of crown; D2, B−ray view of partial crown, note deep elongate groove on well−preserved partition plate. E. Periechocrinus longimanus (Angelin, 1878), GIT 405−4−1, Jaani Formation (Wenlock), Janni Cliff. Lateral view of partial calyx, calyx sutures very indistinct. F. Eucalyptocrinites sp. 1, TUG 1375−3, Jaani Formation (Wenlock), Undva Cliff. Lateral view of broken crown. G. Calliocrinus sp., TUG 1395−6, Ninase Member, Jaani Formation (Wenlock), Suuriku Cliff. Broadly bifurcating spine. H. Eucalyptocrinites sp. 1, TUG 1375−2, Jaani Formation (Wenlock), Undva Cliff. Lateral view of crown of juvenile. Scale bars 10 mm.