A REVISION OF THE CALICOTYLINAE MONTICELLI, 1903 (MONOGENEA, MONOCOTYLIDAE)

A total of 153 elasmobranchs (46 species), either freshly collected fr om the Gulf of Mexico, USA and Tasmania, Australia or museum specimens collected from various localities worldwide, were examined for calico tyline (Monocotylidae) monogeneans. Thirty-five elasmobranchs, represe nting 17 species, were infected with Calicotyle spp. which we identifi ed as the following previously described species: C. asterii (Szidat, 1970) Timofeeva, 1985, C. kroyeri Diesing, 1850, C. macrocotyle Corder o, 1944, C. similis (Szidat, 1972) Timofeeva, 1985, C splendens (Szida t, 1970) Timofeeva, 1985, C. stossichi Braun, 1899 and C. urolophi Chi sholm, Beverley-Burton & Last, 1991. The Calicotylinae, which comprise s the genera Calicotyle and Dictyocotyle, is revised based on suppleme ntary material as well as deposited type-material. We consider 14 of t he 17 nominal Calicotyle spp, to be valid. C. rosinae Kusnetzova, 1970 is synonymised with C. macrrocotyle, C. sjegi Kusnetzova, 1970 is con sidered a species inquirenda and C. inermis Woolcock, 1936 a species i ncertae sedis. Additional data and illustrations to show the morpholog ical features of the hamuli and male copulatory organ, the form of the intestinal caeca, vaginae and ovary and the distribution of the vitel larium are provided for all valid species. The distribution of the 14 hooklets in the adult haptor of Dictyocotyle coeliaca Nybelin, 1941 is illustrated for the first time. We provide new host and locality reco rds for C. asterii, C. kroyeri, C. macrocotyle and C. stossichi and ne w locality records for C. similis and C. splendens. A key to species o f the Calicotylinae is also included. Host-specificity, geographical d istribution and the need for information regarding the development of individuals from juvenile to adult are discussed.