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

Title:

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.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:049cae9a-47af-4d20-b353-6b5e6bd2b5b7
uuid:049cae9a-47af-4d20-b353-6b5e6bd2b5b7
doi:10.14411/fp.2009.003

Subject:

Gyrodactylus, morphometry, Corydoras, and sympatry

Type:

model:article and TEXT

Format:

bez média and svazek

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.

Language:

English

Rights:

http://creativecommons.org/licenses/by-nc-sa/4.0/
policy:public

Coverage:

13-20

Source:

Folia parasitologica | 2009 Volume:56 | Number:1

Harvested from:

CDK

Metadata only:

false