A NEW SPECIES OF CIROLANID ISOPOD (PERACARIDA, ISOPODA) COLLECTED FROM CENOTE AEROLITO, COZUMEL ISLAND, NORTHWESTERN CARIBBEAN

A new species of Cirolana Leach, 1818, collected from Cenote Aerolito, Cozumel Island, Mexican Caribbean, is described. Cirolana (Anopsilana) adriani sp. nov. has a body 2.7x as long as wide, widest at pereonites 5-6; cephalon smooth, with small rostral point; pereonites without tubercles or ridges; antenna 2 not surpassing back of segment 2 of pereon; pleonite 4 lacking free ventrolateral margins; pleotelson as long as wide, smooth, with 9 distal robust setae; appendix masculina extremely long, 2x as long as endopod of pleopod 2. The main differences between the new species and the marine species Cirolana (Anopsilana) jonesi (Kensley, 1987) and C. (A.) sinu (Kensley & Schotte, 1994), as well as the stygobitic species C. (A.) yucatana Botosaneanu & Iliffe, 2000, the most similar known species of Cirolana (Anopsilana) in the region, are described. This is the second isopod of the genus Cirolana recorded from the karstic systems of the Yucatan Peninsula.