| neotropical monogenoidea 37. redescription of gyrodactylus superbus (szidat, 1973) comb. n. and description of two new species of gyrodactylus (gyrodactylidea: gyrodactylidae) from corydoras paleatus and c. ehrhardti (teleostei: siluriformes: callichthyidae) of southern brazil. | two new species of gyrodactylus (gyrodactylidae) are described from corydoras paleatus (jenyns) and corydoras ehrhardti steindachner (callichthyidae) of rio piraquara, municipality of piraquara, near curitiba, paraná, brazil: gyrodactylus anisopharynx sp. n. and gyrodactylus samirae sp. n. these species are unique among the known neotropical species of gyrodactylus by the combination of several characters. gyrodactylus anisopharynx is characterised by having hooks with point evenly curved, toe m ... | 2000 | 10945734 |
| neotropical monogenoidea. 53. gyrodactylus corydori sp. n. and redescription of gyrodactylus anisopharynx (gyrodactylidea: gyrodactylidae), parasites of corydoras spp. (siluriformes: callichthyidae) from southern brazil. | morphometric analyses are used to evaluate the taxonomic status of two sympatric variants of gyrodactylus anisopharynx popazoglo et boeger, 2000 (forma "large-pharynx" and forma "small-pharynx"). the parasites were collected from the piraquara river and the miringuava river, state of paraná, brazil, between february 2005 and may 2006. a total of 132 parasites were measured from two hosts, corydoras ehrhardti steindachner and corydoras paleatus (jenyns). eleven morphological features of the hapto ... | 2009 | 19402241 |
| choice matters: incipient speciation in gyrodactylus corydori (monogenoidea: gyrodactylidae). | we investigated how gyrodactylus corydoribueno-silva and boeger, 2009 exploits two sympatric host species, corydoras paleatus (jenyns, 1842) and corydoras ehrhardti steindachner, 1910. specimens of g. corydori were collected from the piraquara and miringuava rivers, state of paraná, brazil, between 2005 and 2006. a total of 167 parasites was measured from both host species. nine morphometric features of the haptoral sclerites were measured and analyzed by discriminant analysis, cluster analysis ... | 2011 | 21310159 |
| muscle water control in crustaceans and fishes as a function of habitat, osmoregulatory capacity, and degree of euryhalinity. | this study aimed at detecting possible patterns in the relationship between anisosmotic extracellular regulation (aer) and isosmotic intracellular regulation (iir) in crustaceans and teleost fish from different habitats and evolutionary histories in fresh water (fw), thus different osmoregulatory capabilities, and degrees of euryhalinity. crustaceans used were the hololimnetic fw aegla schmitti, and macrobrachium potiuna, the diadromous fw macrobrachium acanthurus, the estuarine palaemon pandali ... | 2008 | 18325804 |
| mode of transmission, host switching, and escape from the red queen by viviparous gyrodactylids (monogenoidea). | compared to other monogenoidean groups, viviparous gyrodactylids exhibit extraordinary species diversity and broad host range. it has been suggested that this evolutionary success is associated with a suite of morphological and life-history traits that include, in part, continuous transmission (i.e., ability to infect new hosts throughout the gyrodactylid life cycle). experiments were conducted to explore the putative adaptive advantage of continuous transmission within viviparous gyrodactylids ... | 2005 | 16419740 |