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Squalotrema llewellyni gen.nov., sp.nov., a monocotylid monogenean from the nasal fossae of the spur-dog, Squalus acanthias, at Plymouth

  • G. C. Kearn (a1) and J. E. Green (a2)

Extract

A description is given of Squalotrema llewellyni gen.nov., sp.nov., a monocotylid monogenean from the nasal fossae of the spur-dog Squalus acanthias. The parasite differs from representatives of other monocotylid genera in the number and arrangement of loculi on the haptor. In order to accommodate the genus Squalotrema, the diagnosis of the subfamily Merizocotylinae (Yamaguti, 1963) has been amended.

The eggs differ in shape from those of other monogeneans. Each egg appears to be derived from a tetrahedron by flattening of one of the four apices. A long, coiled appendage projects from the flattened apex and the face of the egg from which the appendage projects also bears two spurs. The curved body of the fully developed, ciliated oncomiracidium occupies only two of the three rounded corners of the egg.

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Johnston, T. H. & Tiegs, O. W. 1922. New gyrodactyloid trematodes from Australian fishes together with a reclassification of the super-family Gyrodactyloidea. Proceedings of th Linnean Society of New South Wales 47, 83131.

Kearn, G. C. 1968. The larval development of Merizocotyle sp., a monocotylid monogenean from the nasal fossae of Raia undulata. Parasitology, 58, 921–928.

Kearn, G. C. 1975. The mode of hatching of the monogenean Entobdella soleae, a skin parasite of the common sole(Solea soled). Parasitology, 71, 419431.

Kearn, G. C. 1976. (Observations on monogenean parasites from the nasal fossae of European rays: Empruthotrema raiae(MacCallum, 1916) Johnston and Tiegs, 1922 and E. torpedinis sp.nov. from Torpedo marmorata.) Proceedings of the Institute of Biology and Pedology, Vladivostok, U.S.S.R., 34, 4554. [In Russian].

Llewellyn, J. 1963. Larvae and larval development of monogeneans. Advances in Parasitology, 1, 287326.

Taschenberg, O. 1879. Zur Systematik der monogenetischen Trematoden. Zeitschrift fur die gesamte Naturwissenschaft, 52, 232265.

Yamaguti, S. 1963. Systema Helminthum.Vol. IV, Monogenea and Aspidocotylea. 699 pp. John Wiley.

Squalotrema llewellyni gen.nov., sp.nov., a monocotylid monogenean from the nasal fossae of the spur-dog, Squalus acanthias, at Plymouth

  • G. C. Kearn (a1) and J. E. Green (a2)

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