Trypanorhynch cestodes (Eutetrarhynchidae) from batoids along the coast of Argentina, including the description of new species in Dollfusiella Campbell et Beveridge, 1994 and Mecistobothrium Heinz et Dailey, 1974

MENORET, A.; IVANOV, V. A.

FOLIA PARASITOLOGICA

FOLIA PARASITOLOGICA

Lugar: Ceske Budejoviske; Año: 2015

0015-5683

During a recent parasitological survey of elasmobranchs along the coast of Argentina, 2 new species of eutetrarhynchids of the genera Dollfusiella and Mecistobothrium were collected from batoids. Dollfusiella acuta sp. n. was found in 4 arhynchobatid skates (i.e. Sympterygia acuta, Sympterygia bonapartii, Atlantoraja castelnaui, and Atlantoraja platana) and Mecistobothrium oblongum sp. n. in the eagle ray Myliobatis goodei. Dollfusiella acuta sp. n. has a tentacular armature consisting of basal rows of uncinate hooks, a distinct basal swelling with uncinate, falcate and billhooks, and a heteroacanthous metabasal armature with heteromorphous hooks (bothrial uncinate hooks and antibothrial falcate hooks), hooks 1(1´) not separated, testes in 2 columns and an internal seminal vesicle. The tentacular armature of Me. oblongum sp. n. is characterized by basal rows of uncinate hooks, a basal swelling with uncinate and falcate hooks, a typical heteroacanthous metabasal armature with heteromorphous hooks (uncinate and falcate to spiniform), and hooks 1(1´) separated and of a constant size along the tentacle. It also possesses an elongate scolex, numerous testes arranged in 5?6 irregular columns, and an internal seminal vesicle. The discovery of Me. oblongum in My. goodei represents the first record of Mecistobothrium in the southwestern Atlantic. An amended description of D. cortezensis is also provided to clarify details of the scolex and tentacular armature. Members of Dollfusiella in the southwestern Atlantic are specific to a single host species or to a particular host family, while Me. oblongum was found in a single host species. Although globally some plerocerci of eutetrarhynchids have been found in teleosts, extensive examination of teleosts off the coast of Argentina suggests that the transmission pathways of these species are exclusively based on invertebrates as intermediate or paratenic hosts.