New Species of Acanthochondria (Copepoda:Chondracanthidae) parasitizing the longtail southern cod, Patagonotothen ramsayi (Perciformes: Nototenidae) from patagonian waters, Argentina

CANTATORE, D.M.P.; LANFRANCHI, A.L.; TIMI, J.T.

Viña del Mar

Simposio; VIII Internacional Symposium of Fish Parasites (ISFP); 2011

A new species of parasitic copepod belonging to the genus Acanthochondria (Copepoda:Chondracanthidae) is described and illustrated based on specimens of both sexes collectedfrom inner surface of the operculum of the longtail southern cod, Patagonotothen ramsayi(Regan) (Perciformes: Nototheniidae), from the Patagonian Shelf, Argentina (42–48°S; 60–63°W). The new species is characterized by the combination of a Type B-III antennule andType A leg 2, in addition to both the cephalosome and the trunk being wider than long. Thenew species most closely resembles A. incisa Shiino, 1955, A. ophidii (Krøyer, 1863), A.priacanthi Shiino, 1964, and A. tasmaniae Heegaard, 1962, but differs from these species inthe general measurements and proportions of the body, shape and size of head, shape andsize of genitoabdomen and fine details of appendages such as the armature of antennule,ornamentation of both pairs of legs, number of teeth on mandible and maxilla, andornamentation on maxilliped. This is the first Acanthochondria species recorded from anototheniid and the second southernmost record of a species of this genus in thesouthwestern Atlantic Ocean.