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1. 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

Creator:
Popazoglo, Flávio and Boeger, Walter A.
Format:
print
Type:
model:internalpart and TEXT
Subject:
Gyrodactylus, Paragyrodactylus, Paragyrodactyloides, Corydoras, Rio Pequeno, Rio Piraquara, Parana, and Brazil
Language:
English
Description:
Two new species of Gyrodactylus (Gyrodactylidae) are described from Corydoras paleatus (Jenyns) and Corydoras ehrhardti Stcindachner (Callichthyidae) of Rio Piraquara, Municipality of Piraquara, near Curitiba, Parana, Brazil; Gyrodactylus anisopharynx sp. n. and Gyrodactylus samirae sp. n. These species arc 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 moderately pointed, round convex heel, straight sloping shelf, superficial bar with anterolateral projections and male copulatoiy organ armed with two rows of spinelets. Two variants of G. anisopharynx, of distinct pharynx size, are recognised: forma “largc-pharynx” and forma “small-pharynx". Gyrodactylus samirae is characterised by having hook with straight shaft, short slightly recurved point, truncate toe, trapezoidal heel, shelf slightly concave, orthogonal to shaft; anchors with relatively short superficial root; superficial bar with extremities lightly expanded; and male copulatory organ armed with two rows of spinelets. Paragyrodactyloides superbus (Szidat, 1973) is redescribed and transferred to Gyrodactylus based on examination of type and new specimens. Features previously considered as diagnostic for the genus are misinterpretations or primitive characters for Gyrodactylus spp.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

2. Neotropical Monogenoidea. 53. Gyrodactylus corydori sp. n. and redescription of Gyrodactylus anisopharynx (Gyrodactylidea: Gyrodactylidae), parasites of Corydoras spp. (Siluriformes: Callichthyidae) from southern Brazil

Creator:
Bueno-Silva, Marlus and Boeger, Walter A.
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
Gyrodactylus, morphometry, Corydoras, and sympatry
Language:
English
Description:
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 haptoral sclerites and pharynx were measured and analysed by discriminant analysis and principal components analysis. The results indicate that the observed morphological variation cannot be associated to intraspecific variation or phenotypic plasticity (P < 0.0001). Consequently, the two variants previously allocated in G. anisopharynx represent two independent species. Since the holotype was defined as the variant ''large-pharynx'', Gyrodactylus corydori sp. n. is proposed to accommodate specimens previously reported as ''small-pharynx'' variant of G. anisopharynx. Morphometric analyses showed that the hook, the anchor, and the pharyngeal bulb are significantly distinct (P < 0.0001) between G. corydori sp. n. and G. anisopharynx (s.s.). The new species is characterized by having hooks with point moderately curved, robust convex heel, convex shelf, toe concave moderately pointed with depression; deep bar with two submedial, posterior projections; anchors with robust superficial root; superficial bar with two small anterolateral projections; and male copulatory organ armed with two rows of spinelets.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public