PESCE G.L.& D. P. GALASSI. 1985 Due nuovi Diacyclops del complesso "languidoides (Copepoda: Cyclopidae) di acque sotterranee di Sardegna e considerazioni sul significato evolutivo dell'antenna nei copepodi stigobionti.
Two new Diacyclops of the languidoides group are described from ground waters (wells and hyporheic habitats) of Sardinia.
The authors suggest the subdivision of the "languidoides-group as follows: stygophilic and stygoxen species, characterized by well developed exopod on the antenna and remarkable armature on its basibodite; stygobitic species, without exopod and with reduction, or absence, of armature on the basipodite.
Evidence is presented supporting an adaptative (convergent evolution) meaning for the above-mentioned characters in the Cyclopidae family. Reprints request to pesce@univaq.it
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