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Remarques a propos dEchinides representants du genre Diplocidaris Desor

, : Remarques a propos dEchinides representants du genre Diplocidaris Desor. Bull Soc Geol France 16(1/3): 147-149

Diplocidaris. with crenu-lated tubercles, leads to a var. with smooth tubercles. There are similar examples in many genera, e, g., Paracidaris. P. florigemma is distinct from Alpicidaris cureti because of the existence of crenulations on the tubercles. The passage from a crenulated var. to a smooth crenulated one takes place by mutation.


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