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Sources of material of Entobdella spp. examined in present study

Sources of material of Entobdella spp. examined in present study

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Article
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Morphologic and morphometric characters for 14 Entobdella species were reviewed. Entobdella brattstroemi, E. curvunca, E. rosaceus, E. squamula, and E. steingroeveri were found to be morphologically indistinguishable from E. hippoglossi, the type species, and are declared synonyms. A redescription of E. hippoglossi is presented. Allometry and the u...

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Context 1
... of Entobdella spp. were obtained from sources listed in Table 1. Preserved specimens were stained in acetocarmine, differen- tiated in acid alcohol, routinely dehydrated, cleared, and mounted in Permount. ...
Context 2
... further test for the significance of morphometric differences between species the equation of simple allometry y = bxa (Gould 1966) was applied. The exponent a (the slope of regression on log- transformed data) indicates the ratio of specific growth rates of y and x (with values of a greater than, equal to, or less than 1 indicating - - - - 6883, 6884, 6974, 7151, 7177, 7181, 7188, 25051 NMCPC 1900-503 (9 vial specimens; all mounted in present study) 47982, 47983, and 8 unnumbered specimens 6 vial specimens; all mounted in present study 58 vial specimens; 43 mounted in present study G. 103 17 (holotype) 6509 6453 1 38 147 (paratype) 43 mounted specimens 42900, 64532 3 vial specimens; all mounted in present study 218 positive allometry , isometry, or negative allometry , respectively). Atchley et al. (1976) warned against the use of ratios in taxonomy as ratio variables behave unpredictably when variation in the denomi- nator is large. ...

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Citations

... However, most species have been described on a very small number of specimens, and it is not known whether these structures change in size or numbers when specimens grow; very few reports on monopisthocotylean growth exist (e.g. Lackenby et al. 2007;Kearn 1963Kearn , 1990Klassen et al. 1989;Ogawa 1984), and none is about the variation of haptoral sclerites in monocotylids. In this study, we took the opportunity of a heavy infection on an aquarium ray (Justine et al. 2010), which provided a large number of monocotylids (Dendromonocotyle pipinna , to analyse these variables. ...
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Using scanning and transmission electron microscopy, investigations were carried out on the anterior adhesive areas of Entobdella sp. from the skin of Himantura fai and Entobdella australis from the skin of Taeniura lymma at Heron Island, Australia. All studies were of parasites detached from either host tissue or a substrate. Both species of monogeneans have two characteristic anteroventral adhesive pads, one on either side of the head, subdivided to a "diadem". Two types of gland cells are associated with the anterior adhesive areas in both species and each cell type produces a different secretion: a rod-shaped secretion and a smaller, roughly spherical secretion. Each secretion type differs in electron-density, with those putatively in the process of formation being less electron-dense. Both types of secretory bodies are membrane-bound. Microtubules are evident around forming rod-shaped bodies. The bounding membranes of the rods of both species show a periodic banding of approximately 12 nm. Both types of secretion are present at the surface of the adhesive pads in specimens of Entobdella sp. fixed when detached from the host. The secretory bodies observed in Entobdella sp. and E. australis from rays show some differences to those reported from Entobdella soleae, a parasite of a flatfish teleost. Other ultrastructural differences also exist. We conclude that the types of adhesive secretory bodies may remain constant within genera providing the hosts are similar.