[Coral-List] White-spined Diadema
BOOTH, Charles E. (Biology)
BOOTH at easternct.edu
Sat May 10 23:21:04 EDT 2008
Stuart Wynne wrote: "I have been trying to find references to the
white spined Diadema..."
The following description of D. antillarum appears to be attributed to
Libby Hyman (Hyman, L.H. 1955. The invertebrates: Echinodermata, Vol.
4, McGraw Hill, New York. 763 pp):
"Diadema is uniformly dark purple or almost black when mature, but in
the young (to 2 cm in diameter) the spines may be banded with white.
Adults occasionally have patches of white spines and very rarely are
Odgen, J.C. and R.C. Carpenter. 1987. Species profiles: life histories
and environmental requirements of coastal fishes and invertebrates
(south Florida) -- long-spined black sea urchin. U.S. Fish and Wildl.
Serv. Biol. rep. 82 (11.77). U.S. Army Corps of Engineers, TR EL-82-4
The white color is almost certainly genetically determined. I've never
seen any references suggesting an environmental influence on spine
color in Diadema, and a cursory search didn't turn up any. In
particular, this review by John Randall et al. doesn't mention it:
Randall, J.E. et al. (1964 ) Notes on the biology of the echinoid
Diadema antillarum. Carib. J. Sci 4: 421-432.
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