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Daphnia (Ctenodaphnia) hispanica sp. nov., a new daphnid (Cladocera) from Spain

Abstract:

Daphnia (C.) hispanica n. sp. has thoracic limbs of A 'D. (C.) atkinsoni type' and is very similar to D. chevreuxi Richard, 1896. With this species D. (C.) hispanica shares the presence of a soft accessory seta on the outer side of the trunk of the first thoracic limb, apparently unique among the genus Daphnia. Although other morphological characteristics are very similar in this two species, a detailed comparison reveals that they can easily be separated as different species. The most useful features in differentiating both species are:D. (C.) hispanica has a dorsal crest in the head, its rostrum is longer, its accesory seta of the first thoracic limb is more developed, the juveniles are not helmeted and its male postabdomen lacks individual denticles on the anal and preanal margin. The new species is, up to now, restricted to Spain and inhabits the temporary and low mineralized waters of the steppe regions. © 1990 Kluwer Academic Publishers.