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Prevalence and distribution of the dinoflagellate Thalassomyces californiensis Collard, 1966 (Ellobiopsidae) on Pasiphaea emarginata Rathbun, 1902 (Decapoda, Caridea, Pasiphaeidae), off western Mexico

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A large series of 96 specimens (79 females, 13 ovigerous females, and 3 males; 1 unsexed specimen) of Pasiphaea emarginata Rathbun, 1902, was collected off western Mexico, mostly during the TALUD project aimed at the study of deep-water benthic and pelagic species. The external dinoflagellate parasite Thalassomyces californiensis Collard, 1966 (Ellobiopsidae) was observed on the eyes of 41 specimens, but was notably absent in ovigerous females (13 specimens), while it infested 45.2% of the non-ovigerous females. Two of the three males captured were infested (one with the parasite on both eyes, the other only on the left eye). In non-gravid females, the parasite was located either on the left eye (16 cases), on the right eye (18 cases) or on both eyes (4 cases). Based on the material examined, the number of known localities for Pasiphaea emarginata is increased from three to 24 and to a new southernmost limit off SW Mexico, while the records for T. californiensis are the first for the entire Gulf of California.

Affiliations: 1: Laboratorio de Invertebrados Bentónicos, Unidad Académica Mazatlán, Instituto de Ciencias del Mar y Limnología, Universidad Nacional Autónoma de México, P.O. Box 811, Mazatlán, Sinaloa 82000, Mexico


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