The Echinoid Directory

Contributed by Simon Coppard, September 2006

Coelopleurus (Keraiophorus) floridanus A. Agassiz, 1872, p. 102

Diagnostic Features	The test is subcircular and has broad, straight edged, naked median interambulacral regions. These are cream, with each median region having a faint zig-zag lilac line that starts from the genital plate and continues to the ambitus. These naked median regions have red/orange borders that do not proceed below the ambitus. Primary spines are curved and unbanded; red distally (on the dorsal surface) blending into green proximally, typically just above the spine's collar. Cream primary spines are commonly seen beneath the ambitus. The spine's collar has 2 or 3 longitudinal ridges either side of the central dorsal ridge, with many ridges on the ventral surface and granules between ridges. Secondary spines are pointed (not club-shaped). All ophicephalous pedicellariae have unconstricted valves and are abundant both orally and aborally.
Distribution	West Indies, East coast of America as far as Cape Hatteras
Classification and/or Status	Arbacioida, Arbaciidae, Coelopleurus
Remarks	This species is similar to C. interruptus and C. vittatus in the colour and markings on the naked median regions of the interambulacra. However, in these species the naked median regions are bordered by white (not red), primary spines are almost straight, and the aboral ophicephalous pedicellariae have constricted valves. Agassiz, A. 1872-1874. Revision of the Echini. Memoirs of the Museum of Comparative Zoology at Harvard College III: pt. 1-2: i-xii, 1-378, pls. 1-49 (1872); pt. 3: 379-628 +1, pls. 50-77 (1873); pt. 4: 629-762, pls. 78-94 (1874).