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Differentiation of Gyrodactylus bullatarudis Turnbull, 1956 and G. rasini Lucky, 1973 (Monogenea) with reassignment of Gyrodactylus bullatarudis Turnbull, 1956 sensu Harris (1986) to G. rasini

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Gyrodactylus rasini from Xiphophorus helleri Heckel, 1848 x X. maculatus (Gunther, 1866) hybrids and museum specimens previously identified as Gyrodactylus bullatarudis Turnbull, 1956 sensu Harris (1986), also from Xiphophorus hybrids, are compared with paratypes of G. bullatarudis Turnbull, 1956 from Poecilia reticulata Peters, 1859. Gyrodactylus rasini was differentiated by us as following: (1) the ventral bar had longer, slightly curved antero-lateral processes, converging towards each other apically; (2) the marginal hook blade point extended nearly level with or beyond the marginal hook toe; (3) a pronounced bend in the marginal hook blade immediately before the point; and (4) a bifurcate base on both sides of the large spine of the cirrus. By contrast G. bullatarudis was differentiated by: (1) slightly shorter and straighter anterolateral processes of the ventral bar; (2) a marginal hook blade point which did not extend level with or beyond the toe; (3) a marginal hook blade with a straight point; and (4) the base of each side of the large spine of the cirrus which curved behind and joined. From these morphological differences it is concluded that the two taxa are distinct, redescriptions of both species are given and G. bullatarudis sensu Harris (1986) is reassigned to G. rasini. Gyrodactylus bullatarudis from P. reticulata were, however, capable of infecting and reproducing on Xiphophorus hybrids.
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Keywords: G . BULLATARUDIS; G . RASINI; GYRODACTYLUS; MONOGENEA; POECILIA RETICULATA; SPECIES DISCRIMINATION; XIPHOPHORUS

Document Type: Research Article

Publication date: March 1, 2000

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