Henneguya intracornea n.sp. (Myxozoa: Myxosporea) parasita do olho do lambari, Astyanax Scabripinnis (Jenyns, 1842) (Osteichthyes, Characidae)

Abstract

Descreve-se um novo mixosporídeo - Henneguya intracornea n.sp - parasita da córnea de peixe de água doce, Astyanax scabripinnis (Jenyns, 1842) da região de Campinas, Sp. As sucessivas fases evolutivas são descritas. Assinalam-se os caracteres morfológicos e biológicos que distinguem H. intracornea n.sp. das demais espécies do gênero. Destaca-se o parasitismo exclusivo da córnea do peixe parasitado e suas características morfológicas, com ênfase para sua típica cápsula polar, com a forma de garrafa e para os dois processos caudais, desiguais no comprimento.<br>A new myxosporidian, Henneguya intracornea n.sp., parasitizing the ocular cornea of a freshwater characidian fish Astyanax scabripinnis (Jenyns, 1842), is described. The parasitized hosts have been collected from water reservoirs. These aquatic environments were constructed at small natural branches of Atibaia and Jaguari rivers, near Campinas, SP, Brazil. The different developmental stages of H. intracornea n.sp., as well as their morphological and biological characteristics are studied. In all cases examined it was observed that the myxosporidian only occurred in the cornea. The most important morphological characteristics of this new species are its bottle-shaped polar capsules and their unequal caudal processes

Ultrastructural aspects of the myxosporean Henneguya astyanax n. sp. (Myxozoa: Myxobolidae), parasite of the Amazonian teleost Astyanax keithi (fam. Characidae)

“…Note that Henneguya sp. (Azevedo & Matos 1989) and H. amazonica (Rocha et (Kent & Hoffman 1984), H. intracornea (Gioia et al 1986), H. amazonica (Rocha et al 1992) and H. striolata (Casal et al 1997). The body of H. occulta is wider, the tail shorter and the polar capsule larger than in the species described in this study.…”

“…from published papers on Brazilian species, based on the guidelines for species description proposed by Lom & Arthur (1989). Although the presence of an iodinophilous vacuole is an inconstant feature within the same species (Podlipaev & Schulman 1978, Lom & Noble 1984, Mitchell 1988) and without any real taxonomic value, it is included as a variable (Table 1) (Gioia et al 1986), H. amazonica (Rocha et al 1992) and H. striolata (Casal et al 1997). The body of H. occulta is wider, the tail shorter and the polar capsule larger than in the species described in this study.…”

Comparative evaluation of the susceptibility of cultivated fishes to the natural infection with myxosporean parasites and tissue changes in the host

“…Several species of Henneguya infecting fish have been described in Brazil (Pinto, 1928;Guimarães & Bergamin, 1933;Cordeiro et al, 1983Cordeiro et al, /1984Gioia et al, 1986;Azevedo & Matos, 1989;Rocha et al, 1992;Torres et al, 1994;Azevedo & Matos, 1995Gioia & Cordeiro, 1996;Casal et al, 1997).…”

A new species of Henneguya, a gill parasite of Astyanax altiparanae (Pisces: Characidae) from Brazil, with comments on histopathology and seasonality

“…The presence of myxosporeans in lambari has been reported, with eight species of Henneguya having been described so far (Cordeiro et al 1983, Gióia et al 1986, Gióia & Cordeiro 1987, although none in A. altiparanae Garutti & Britski, 2000. During a study of the myxosporean fauna in A. altiparanae collected near the city of Campinas, in the state of São Paulo, Brazil, we observed a new species of Henneguya parasitizing the gills of this species.…”