Nasicola hogansi n.sp. (Monogenea: Capsalidae) from bluefin tuna, Thunnus thynnus (Osteichthyes: Scombridae), in the northwest Atlantic

• Published in: Canadian Journal of Zoology
• Main Authors: Wheeler, Terry A., Beverley-Burton, Mary
• Format: Article in Journal/Newspaper
• Language: English
• Published: Canadian Science Publishing 1987
• Subjects: Canada; Northwest Atlantic; Prince Edward Island
• Online Access: http://dx.doi.org/10.1139/z87-296; http://www.nrcresearchpress.com/doi/pdf/10.1139/z87-296

Nasicola hogansi n.sp. is proposed for material from bluefin tuna (Thunnus thynnus) taken in the Gulf of St. Lawrence off Prince Edward Island, Canada, and is distinguished from Nasicola klawei (Stunkard, 1962), the type and only other known species in the genus, by the smaller total body length, a haptoral diameter of approximately 40% of the total length (as compared with 20–30%), a greater number of small dorsomarginal spines, fewer large dorsomarginal spines, and a greater number of testes. An emended generic diagnosis for Nasicola Yamaguti, 1968 is provided. Four genera are recognized within the Capsalinae: Capsala Bosc, 1811; Tristoma Cuvier, 1817; Capsaloides Price, 1938; and Nasicola Yamaguti, 1968. Reference is made to the taxonomic confusion regarding generic definitions within the subfamily; it is suggested that taxonomic revision of the Capsalinae would result in major systematic changes at the generic level.