radiolaria - rads_cat - Calocyclas advena

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Calocyclas advena

Citation: Calocyclas advena Clark & Campbell 1945

Shell generally conical (usually within 43°, often less) and having a single, short (0.25 total length), subterminal, 3-bladed prismatic apical horn the blades of which are similarly triangular save that one of them descends down the back of the cephalis to the cervix, and the opposite one flares out over the crown; cephalis caplike or elongate-subhemispheric, short (about 0.67 length of horn), and narrow (its base 0.8 altitude), with distinct change in contour around the neck; thorax truncate-conical (under 40°), usually with asymmetrical, bulged sides, rather long (approximately 0.3 total length), with wide base (over 0.1 greater than altitude), and with distinct lumbar stricture; abdomen wide, generally like a wide skirt, of truncate-conical, with mildly bulged sides (usually fairly symmetrical), and probably at the lower end provided with a row of tiny terminal teeth (all our specimens torn); pores of cephalis similarly circular and of the same size, few in number (about 50 in all), and deeply set, pores of thorax similarly circular and of similar large size, very few in number (about 14), pores of abdomen generally subpolygonal, large, and not numerous (not over 36); framework of cephalis having subpolygonal, depressed areas from the nodes of which arise many short, divergent sepaloid spines, framework of thorax similarly polygonal, the polygons being coarse and few and having both nodal and internodal, sharp, conical sepaloid points; framework of abdomen polygonal but without spines or points in marked contrast with the two upper shell-joints.

Total length (broken) 140µm; diameter of cephalic pores 2.2µm, of thoracic pores 16.6µm of abdominal pores 18.8µm.

Distinguishing features: Calocyclas advena n. sp. lacks the lamellar feet of the other species.

Haeckel listed under the subgeneric name , but did not include the subgeneric name in the species name.[comment from RadWorld database]

References:

Clark, B. L. & Campbell, A. S. (1945b). Radiolaria from the Kreyenhangen Formation near Los Banos, California. Geological Society of America, Memoir. (10): 1-66. gs

CATALOG OF ORIGINAL DESCRIPTIONS: Calocyclas advena Clark & Campbell 1945

Calocyclas advena

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