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Nishigori, 1924) (Digenea: Heterophyidae

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Nishigori, 1924) (Digenea: Heterophyidae -Revista Científica, FCV-LUZ 1 Vol. XIII, N" 4, 285-292, 2003 DESCRlPTlON OF DIFFERENT DEVELOPMENTAL STAGES OF CENTROCESTUS FORMOSANUS (NISHIGORI, 1924) (DIGENEA: HETEROPHYIDAE) DESCRIPCIÓN DE DIFERENTES ESTADIOS DE DESARROLLO DE CENTROCESTUS FORMOSANUS (NISHIGORI, 1924) (DIGENEA: HETEROPHYIDAE) Luz Elena ~ernández',Marcos T. ~íaz'and Abul K. ~ashirullah~.~ 1Instituto de Investigaciones en Biomedicna y Ciencias Aplicadas, Laboratorio de Parasitología, Univetsidadde Oriente. "31nstituto Oceanográfico de Venezuela, Universidad de Oriente, Apartado Postal 138, Cumana 6101. Venezuela. ABSTRACT Descriptions of the different imrnature stages (redia, cercaria, The intestinal trernatodes of the Centrocestus genus are and metacercaria) and adult stage of Centrocestus formosanus (likewise rnany other worms) herrnaphroditic worrns equipped (Nishigori) are presented. Between 32 and 36 circumoral with a ventral sucker by which attach the wall of intestinal mu- spines are generally reported for the C. fonnosanus, and in this cous. If eggs, passed in the faeces, reach fresh water, a rnira- study 32 circumoral spines were found on the C. formosanus cidiurn is released and can enter and rnultiply in appropriate collected in Sucre state, Venezuela. Experimental infection on fresh water snails, Melanoides tuberculata (Muller, 1774). Here different types of hosts show a high susceptibility of infection the parasite develop for several weeks into a cercarial form for the C. formosanus rnetacercariae. and these are discharged back into water and develop further as metacercariae in or on a second intermediate host, such as Key words: Centrocestus formosanus, Bufo granulosus, Rivu- fiches and tadpoles. This complex cycle is completed when a lus harli, Synbranchus marmoratus, Venezuela. susceptible animal (rats, rnonkey, pigeons, chicken, ducks) in- gest the interrnediate host, and the parasite develops into the RESUMEN adult form. Hurnan infections with C. formosanus have been reported in Forrnosa, Japan and China 14,111. Se presentan las descripciones de los estadios inmaduros The objective of this study is to elucidate al1 stages of the (redia, cercaria, y rnetacercaria) y el estadio adulto de Centro- life cycle of C. formosanus, with the aid of light and scanning cestus formosanus (Nishigori). Entre 32 y 36 espinas circu- electron microscopy (SEM), and to try experimental infection morales son generalmente referidos para C. forrnopsanus, y on some susceotible anirnals. en este estudio fueron encontradas 32 espinas circumorales para esta especie recolectada en el estado Sucre, Venezue- la. Infecciones experimentales en varios hospederos rnostra- MATERIALS AND METHODS ron una alta susceptibilidad a la infección de las metacerca- rias de C. forrnosanus. A total of 883 fresh water snail, Melanoides tuberculata Palabras clave: Centrocestus formosanus, Bufo granulosus, (Mollusca: Prosobranchia: Thiaridae), 50 fishes beionging to Rivulus haiii, Synbranchus marmoratus, Ve- Rivulus harti and one Synbranchus marmoratus were collected nezuela. from a rivulet using srnall hand net in Aguasanta and Yaguar- acual in Sucre state, Venezuela. In addition, 600 tadpoles of Bufo granulosus were collected by hand nets from difierent seasonal ponds in and around the campus of the Universidad de Oriente. All fish and tadpoles were brought to the laboratory and rnaintained in fresh water aquariurn of size of 20 and 40 Recibido: 18 / 12 / 01. Aceptado: 12 / 05 / 03. gallons. Two snails were kept in each finger bowls, with 3A filled .
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