genus: Actinocrinites

© Craven & Pendle Geological Society

Actinocrinites (Top: Apical View, Bottom: Lateral View)

Subclass: Camerata
Order: Monobathrida (Camerates without infrabasals)
Family: Actinocrinitidae

This species, parkinsoni, is based on 10 specimens.  The nearest species with which comparisons can be made is Actinocrintes coplowensis.  In most of the specimens the ornament on the dorsal cup is quite worn.  Sometimes the theca is not quite symmetrical but is tilted towards the anterior side, where the cup is longer and much more expanded on the posterior side.

This species is named in honour of Dr. Donald Parkinson who contributed greatly to the understanding of the geology in the Clitheroe district.

Coplow Quarry in Clitheroe has yielded many Actinocrinites.  Wright recognised 14 species though mainly from the same horizon.  Perhaps the variations in calyx as Wright suggested is not sufficient reason to generate so many different species.  In British species the arms are not preserved.  Brower (Geological Society of America, Memoir 114) having examined Wright's collection in the Royal Scottish Museum in 1965, suggested that perhaps these variations could be merged into four species!

Recorded Actinocrintes (after Westhead, S.) Coplow
A. triacontadacytlus (Miller) x
A. stellaris (de Koninck & Le Hon) x
A. coplowensis (Wright) x
A. elongatus (Wright) x
A. rotundatus (Wright) x
A. nodosus (Wright) x
A. parkinsoni (Wright) x
A. depressus (Wright) x
A. triplus (Wright) x
A. intermedius (Wright) x
A. alatus (Wright) x
A. vermiculatus (Wright) x
A. moderatus (Wright) x
A. comptus (Wright) x