Abstract

The Italian species of Niphargus belonging to the orcinus group are discussed and Niphargus cornicolanus n. sp. (from the Merro sinkhole, Sant'Angelo Romano, Cornicolani Mountains, Latium) is described. This species is morphologically well characterized (Ruffo & Vigna Taglianti, 1968). It is easily distinguished from N. parenzani (from the Alburni Mountains, Campania), to which it had been attributed (G. Karaman, 1993), and from N. patrizii (from the Ausoni and Lepini Mountains, Latium), mainly by the shape of Gn2. The distribution and relationships of the orcinus species group are discussed.

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