Clestobothrium neglectum (Lnnberg, 1893) n. comb. (Cestoda: Bothriocephalidae) from the tadpole fish Raniceps raninus (L.) (Gadidae) from Sweden.
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Clestobothrium neglectum (Lnnberg, 1893) n. comb. is redescribed from specimens previously deposited in The Natural History Museum, London, UK by Dr David I. Gibson obtained from the intestine of the tadpole fish Raniceps raninus (Gadidae) collected from off the western coast of Sweden, near Kristineberg. C. neglectum resembles C. crassiceps (Rudolphi, 1819), the type- and only species currently recognised in the genus, but differs in having fine spiniform-like structures that are likely microtriches covering the posterior fourth of the scolex and all proglottids, a highly folded tegument forming numerous longitudinal ridges on both the dorsal and ventral surfaces of the proglottids giving them a scalloped appearance, a somewhat smaller egg (68 x 35 vs 75 x 40 microm), a U-shaped rather than H-shaped ovary and more testes (70-85 vs 40-50 per proglottid). C. neglectum is also compared to two species with similar scoleces that were previously assigned to Clestobothrium, Bothriocephalus acheilognathi Yamaguti, 1934 and B. kivuensis Baer & Fain, 1958 (considered to be synonymous with B. acheilognathi by Pool, 1987). This is the first report of a species of Clestobothrium Lhe, 1899 (Bothriocephalidae) from a gadid fish.
