Parasites from Fishes from Paraná River 461 on Some Trematodes Parasites of Fishes from Paraná River

Crassicutis cichlasomae Manter, 1936 is redescribed for the first time in South America and from a new host: Geophagus brasiliensis (Cichlidae). Iheringtrema iheringi Travassos, 1948 is redescribed for the first time since its original description from Pseudopimelodus zungaro (Pimelodidae); and new host records are referred to Genarchella genarchella Travassos et al. Original figures and measurements are presented. RESUMO Sobre alguns trematódeos parasitas de peixes do Rio Paraná Crassicutis cichlasomae Manter, 1936 é redescrito pela primeira vez na América do Sul e em um novo hospedeiro: Geophagus brasiliensis (Cichlidae). Iheringtrema iheringi Travassos, 1948 é redescrita pela primeira vez desde sua descrição original, de Pseudopimelodus zungaro (Pimelodidae); novos hospedeiros são referidos para Genarchella genarchella Travassos et al.


INTRODUCTION
A survey of the helminth fauna of fishes from the Paraná River was carried out in 1985, in the locality of Guaíra, Paraná State, South of Brazil.The results concerning the nematodes and some trematodes were already published (Moravec et al., 1992a(Moravec et al., , b, c, 1993a, b;, b;Kohn & Fernandes, 1994;Kohn et al., 1997;Kohn et al., 1999).The present paper comprises the results concerning the other digeneans collected in this expedition.Redescription are presented to Crassicutis cichlasomae reported in new host and for the first time in South America and to Iheringtrema iheringi, the first report since its original description.To the other well known species, only the main measurements and comments are presented.

MATERIAL AND METHODS
Fifty one different species of fishes of a total of 145 specimens were examined from Paraná River, in the locality of Guaíra, Paraná State, Brazil.The used methodology were described in Kohn & Fernandes (1994).Measuremensts are given in micrometres otherwise stated with means in parentheses.Voucher specimens are deposited in the Helminthological Collection of the Oswaldo Cruz Institute (CHIOC).The fish species were classified by Dr. M. P. de Godoy and updated based on Eschmeyer et al. (1998).
Site: intestine.Material deposited: CHIOC n. 33937 a-g Intensity of infection: two out of three fish examined were parasitized by seven trematodes each.
In South America the genus Crassicutis Manter, 1936 is represented by C. chuscoi (Pearse, 1920) and C. wallini (Pearse, 1920) in Venezuela, and by C. intermedius (Szidat, 1954) in Argentina (Szidat, 1954), Brazil (Kohn & Fróes, 1986) and Paraguay (Bray et al., 1996).Crassicutis cichlasomae was described by Manter (1936) from the stomach of Cichlasoma mayorum from Mexico; Scholz et al. (1995a)  Intensity of infection: one out of two fish examined harbored two trematodes.Travassos (1948b) erected the genus Iheringtrema to the species I. iheringi Travassos, 1948, based on two specimens collected from the intestine of P. roosevelti from Mogi-Guaçu River, São Paulo State, Brazil.This is the first report of this trematode since its original description, from the same host from another locality.The specimens studied are smaller (2.41-2.82mm ¥ 0.65-0.71mm instead of 3.5-4 mm ¥ 1-1.2 mm) and the vitellaria does not reach the level of the pharynx as in type material.Lunaschi,1987 (Paramphistomidae) (Fig. 4)

Material deposited: CHIOC n. 33924 a-b
Intensity of infection: one fish examined was parasitized by two trematodes.
Microrchis oligovitellum was described by Lunaschi (1987) from the intestine of Luciopimelodus pati and Trachycorystes striatulus from Argentina.In Brazil, Pavanelli et al. (1997a) published the histopatology of the infection of P. galeatus by M. oligovitellum without description of the parasite.Our specimens agree with the original description, although presenting larger body (6.21-7.48mm ¥ 2.52-2.63mm instead of 2.33-3.89mm ¥ 0.86-1.05mm).Intensity of infection: one out of two fish examined were parasitized by one trematode.
In this opportunity a new host, Pimelodus ornatus, is presented for G. genarchella.Intensity of infection: one out of two fish examined was parasitized by two trematodes.
Parspina argentinensis was described by Szidat (1954) from Pimelodus clarias from Argentina.In Brazil it was referred and figured by Fortes & Hoffmann (1985) from the intestine of Pimelodus maculatus from Guaiba estuary.Kohn & Fróes (1986) redescribed it with new morphological data and figures from the same host and locality.We recovered specimens similar to those reported by Kohn & Fróes (1986)  Host: Salminus maxillosus Valenciennes, 1840 (Characidae).
Site: intestine.Material deposited: CHIOC n. 33922 a-h.Intensity of infection: 6 out of 10 fish examined were parasitized by 1 to 120 trematodes.Travassos et al. (1928) identified as Cladocystis trifolium (Braun, 1900) some trematodes collected from Salminus maxillosus from Mogi-Guaçu River.Vaz (1932) described the new species C. intestinalis from the same host from "Tietê" River and considered C. trifolium of Travassos et al. (1928) its synonym.Cladocystis intestinalis was transferred to Neocladocystis by Manter & Pritchard (1969).Neocladocystis intestinalis was also referred by Travassos & Kohn (1965) and by Kohn et al. (1985) from Salminus hilarii.Recently Pavanelli et al. (1997b) referred it also in S. maxillosus as C. intestinalis.We recovered specimens from the typehost, which are a little smaller than those described by Vaz (1932), and smaller and longer than specimens studied by Kohn et al. (1985).They are as large as the specimens presented by Travassos et al. (1928), with narrower eggs.Intensity of infection: one out of ten fish examined was parasitized by one trematode.