Breizacanthus aznari sp. n. (Acanthocephala: Arhythmacanthidae) from the banded cusk-eel Raneya brasiliensis (Ophidiiformes: Ophidiidae) from the Patagonian coast in Argentina

HERNANDEZ-ORTS JESÚS SERVANDO; ALAMA-BERMEJO, GEMA; CRESPO ENRIQUE ALBERTO; GARCÍA NÉSTOR ANÍBAL; RAGA JUAN ANTONIO; MONTERO FRANCISCO E.

FOLIA PARASITOLOGICA

FOLIA PARASITOLOGICA

Año: 2012 vol. 59 p. 264 - 271

0015-5683

Abstract: Breizacanthus aznari sp. n. is described from the banded cusk-eel Raneya brasiliensis (Kaup) (Ophidiiformes: Ophidiidae)from the Patagonian coast in Argentina. Breizacanthus Golvan, 1969 is currently composed of five species (including the newspecies) and is characterised by the absence of trunk spines, a short cylindrical proboscis with two types of hooks and lemnisci longerthan the proboscis receptacle. Breizacanthus aznari is clearly distinguished from B. chabaudi Golvan, 1969 by having 12 longitudinalrows of hooks on the proboscis, instead of 16?18. The new species resembles B. golvani Gaevskaya et Shukhgalter, 1984, B. irenaeGolvan, 1969, and B. ligur Paggi, Orecchia et Della Seta, 1975, all possessing 12 longitudinal rows of hooks. However, B. aznaridiffers from B. golvani in having 4?5 large hooks per row (vs. 8?9) and larger eggs. The new species can be distinguished from B.irenae by the shorter body size of females, the different range of numbers of large hooks of males (4?5 and 5?6, respectively), thesmaller maximum number of small hooks of females (3 and 4, respectively), and the shorter lemnisci. Breizacanthus aznari differsfrom B. ligur by the smaller body length of females, the smaller maximum body length of males, the different range of numbers oflarge hooks of males (4?5 and 5?6, respectively), and smaller lemnisci. This is the first record of a species of Breizacanthus fromfishes of the order Ophidiiformes and from the Southern Hemisphere. Comparative data on species of Euzetacanthus Golvan etHoulin, 1964 and Breizacanthus are also provided.Keywords: spiny-headed worms, Palaeacanthocephala, Euzetacanthus, taxonomy, marine fish, southwestern Atlantic, Patagonia