Merizocotyle euzeti sp. n. (Monogenea: Monocotylidae) from the nasal tissue of three deep sea skates (Rajidae) in the southwestern Atlantic Ocean
2014
Irigoitia, M.M., Universidad Nacional de Mar del Plata (Argentina). Laboratorio de Ictioparasitologia | Cantatore, D.M.P., Universidad Nacional de Mar del Plata (Argentina). Laboratorio de Ictioparasitologia | Delpiani, G.E., Universidad Nacional de Mar del Plata (Argentina). Laboratorio de Ictiologia | Incorvaia, I.S., Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP), Mar del Plata (Argentina) | Lanfranchi, A.L., Universidad Nacional de Mar del Plata (Argentina). Laboratorio de Ictioparasitologia | Timi, J.T., Universidad Nacional de Mar del Plata (Argentina). Laboratorio de Ictioparasitologia
A new species of Merizocotyle (Monogenea: Monocotylidae) is described from the nasal tissues of three deep sea rajid skates: the southern thorny skate, Amblyraja doellojuradoi, broadnose skate, Bathyraja brachyurops, and yellownose skate, Zearaja chilensis, collected off Buenos Aires Province, Argentina, southwest Atlantic Ocean. Two additional species of sympatric rajid, the white-dotted skate, Bathyraja albomaculata, and the Patagonian skate, Bathyraja macloviana, were also examined but no merizocotylines were found. The taxonomy of the Merizocotylinae is not widely accepted and, as a result, the status of Thaumatocotyle and Mycteronastes, and their proposed synonymy with Merizocotyle are currently under discussion. The new species differs from its congeners by having a unique haptoral structure, 6 peripheral loculi that are asymmetrically arranged (one much smaller, indistinctly located in the left or right side of the haptor). The presence of the new species in three sympatric species of Rajidae belonging to distinct genera and subfamilies, as well as its absence in sympatric congenerics indicates the lack of phylogenetic host specificity. Host ecology and geographical distribution appear to be more important than host phylogeny in determining the distribution of this parasite across potential hosts in the region. This constitutes the first record of Merizocotyle in the southwestern Atlantic Ocean.
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