Showing papers in "Journal of the Helminthological Society of Washington in 1990"

Metacercaria of Clinostomum complanatum (Rudolphi, 1814) (Trematoda : Digenea) in a Texas salamander, Eurycea neotenes (Amphibia : Caudata), with comments on C. marginatum (Rudolphi, 1819)

Abstract: Localisation de C. complanatum au niveau de 2 tissus chez 2 neotenes. Comparaison morphologique de C. marginatum, C. complanatum et C. attenuatum

Cuticular ridge pattern in Ostertagia gruehneri and Ostertagia arctica (Nematoda: Trichostrongyloidea) from Caribou, Rangifer tarandus.

Abstract: Comparaison des modeles d'aretes cuticulaires de surface et de la structure de l'œsophage de O. gruehneri et O. arctica, isoles chez R. tarandus

Intra- and interspecific chemoattraction in Echinostoma caproni and E. trivolvis adults in vitro.

Abstract: Intra- and interspecific chemoattraction was studied in 14-day-old Echinostoma caproni and E. trivolvis from domestic chicks. Experiments were carried out at 38.5 ± 1°C in petri dishes with an agar substratum overlaid with Locke's solution. Echino- stoma trivolvis exhibited significantly greater intraspe- cific attraction than E. caproni; this attraction was sig- nificantly greater than the interspecific attraction.

Grillotia similis (Linton, 1908) comb. n. (Cestoda: Trypanorhyncha) from nurse sharks in the Florida Keys.

Abstract: Description de la morphologie du segment et de l'armature tentaculaire chez G. similis. Description de la vitellogenese pour la diagnose du genre Grillotia

Some helminth parasites of Dunlin (Calidris alpina) and Western Willet (Catoptrophorus semipalmatus inornatus) from California

Abstract: Identification des parasites helminthiques trouves au niveau du systeme digestif de C. alpina et C.s. inornatus. Redescription de L. gymnopocha. Presentation de nouveaux hotes

Freezing resistance of a Trichinella spiralis nativa isolate from a gray wolf, Canis lupus, in Montana, with observations on genetic and biological characteristics of the biotype.

Abstract: Comparaison du potentiel de resistance au froid, des caracteristiques biologiques et de la longueur des fragments de restriction du DNA des T.S. nativa isoles chez C. lupus dans le Montana

Effects of aeration and temperature in in vitro and in vivo studies on developing and infective eggs of Ascaris suum

Abstract: Determination des conditions optimales de temperature et d'aeration pour le developpement des œufs de A. suum in vitro et pour l'obtention du potentiel d'infection maximum de ces parasites chez la souris

Redescription of Chroniodiplogaster aerivora (Cobb) gen. n., comb. n. (Rhabditida: Diplogasteridae) from termites.

Abstract: The nematode originally described as Diplogaster aerivora by Cobb is redescribed in the new genus Chroniodiplogaster. Diagnostic characters of the new genus include (1) the presence of 9 genital papillae, 3 of which are closely associated in a triplet set at the base of the tail, (2) 2 separate bursae, 1 which extends ventrolaterally along the tail, and the second, which is associated with the triplet papillae, and (3) a dorsal metarhabdion with a large mobile tooth and subventral metarhabdions with variably sized teeth. Dauer stages of C. aerivora occurred in the heads of worker termites of Reticulitermes tibialis. On occasion, the nematodes would enter the body cavity and kill the termites. In 1916, Cobb described Diplogaster labiata and Diplogaster aerivora in a paper by Merrill and Ford (1916) who described the associations of these 2 nematodes with insects. In this study, the latter species was reported by Merrill and Ford (1916) to occur in the heads of the termite, Leucotermes lucifugus, with insect death result- ing from high numbers of nematodes. Along with his description, Cobb also reported that D. aeriv- ora fed on grasshopper eggs. Banks and Snyder (1920) reported juveniles of D. aerivora in the heads of active, normal-appearing Reticulitermes flavipes and adult nematodes in sick and dead insects. Davis (1919) found Mesodiplogaster (=Diplo- gaster) aerivora in dead and dying larvae of the beetle, Phyllophaga sp., and suggested that the nematodes were the cause of death. Cobb iden- tified Mesodiplogaster aerivora as the nematode responsible for natural mortality of corn ear- worm larvae, Heliothis obsoleta (Winburn and Painter, 1932). Lim et al. (1981) isolated M. ae- rivora from both living and dead grubs of the June beetle, Phyllophaga anxia. Recently, the present author received a culture of M. aerivora that was isolated from Reticulitermes tibialis in

Parasites of summer flounder, Paralichthys dentatus, in the Chesapeake Bay

Abstract: A total of 38 species of parasites was collected from 341 summer flounder, Paralichthys dentatus, in the Chesapeake Bay. The parasites included 8 species of protozoans, 1 monogenean, 11 digeneans, 2 acan- thocephalans, 1 copepod, 1 branchiuran, 1 leech, 10 cestodes, and 4 nematodes. Of the 38 parasites, only 18 species were found in more than 10% of the hosts. Protozoans included the flagellates Cryptobia sp. from the gills and Trypanoplasma bullocki from the blood, the myxozoan Davisia branchiophora from the gall bladder and the ciliate Trichodina sp. from the gills. The monogenean Neoheterobothrium affine occurred on the gills, and digeneans included Stephanostomum dentatum and Opecoeloides vitellosus from the intestine and Stephano- stomum tenue encysted in the gills. The acanthocephalan Serrasentis sagittifer was encapsulated in the mesentery. Metacestodes included Nybelinia bisulcata encapsulated in the intestinal wall, Grillotia smarisgora encapsulated in the mesentary, Rhinobothrium sp. in the intestine, and 3 different forms of the group Scolex pleuronectis, 1 in the intestine, 1 in the gall bladder, and 1 encapsulated in the gills. Other abundant parasites included the nematodes Dichelyne cylindricus in the intestine and a juvenile Hysterothylacium sp. encapsulated in the mes- entery, and the branchiuran Argulus chesapeakensis on the skin. Parasite abundance was analyzed with respect to host size, season, and host migration into and out of Chesapeake Bay. Some parasites, such as Bucephalopsis paralichthydis and A. chesapeakensis, were clearly acquired in the Bay during summer, whereas Bothriocephalus scorpii, Hysterothylacium habena, Acanthochondria galerita, and Rhinobothrium sp. appeared to be acquired offshore. Cryptobia sp. and T. bullocki were more prevalent in fish less than 300 mm total length (TL), whereas S. dentatum, the various S. pleuronectis types, Rhinobothrium sp., D. cylindricus, and the encysted species were The summer flounder, Paralichthys dentatus (L.), is an important commercial and recreation- al species along the middle Atlantic coast of the United States. The species ranges from Nova Scotia to Florida (Guntherz, 1967) but it is most abundant between Cape Cod, Massachusetts, and Cape Fear, North Carolina. Adult summer floun- der normally inhabit coastal and estuarine waters during the warmer months and remain offshore in 36-182 m of water during the fall and winter (Bigelow and Schroeder, 1953; Rogers and Van Den Avyle, 1983). Mature individuals migrate out of Chesapeake Bay in October and spawning takes place on the bottom as fish migrate to their overwintering grounds on the continental shelf (Morse, 1981). Eggs and larvae rise and drift in- shore to coastal and estuarine nursery areas (Smith, 1973). Juvenile flounder remain in nurs- ery areas until October of their second year of life (Powell and Schwartz, 1977). At that time, at least in Chesapeake Bay, a portion of these juveniles migrates out of the estuary and over-

Helminths of the Arizona little striped whiptail, Cnemidophorus inornatus arizonae, and the desert grassland whiptail, Cnemidophorus uniparens (Sauria: Teiidae), from southeastern Arizona.

Abstract: Determination de la presence, de la densite, de la survie et de la localisation de differents helminthes chez C.i. arizonae et chez C. uniparens

Larval Bucephalids (Trematoda: Digenea) Parasitizing Bivalve Molluscs in the Galveston Bay Area, Texas

Abstract: Four species of larval bucephalids are reported from bivalve molluscs in the Galveston Bay area, Texas, and are designated as bucephalid cercaria A from Anadara brasiliana, B from Ischadium recurvum, C from Rangia cuneata, and D from Periploma margaritaceum. This report increases the number of bucephalid larvae reported from the Gulf of Mexico from 6 to 10. The metacercarial stage of B was obtained experimentally in fishes of the genus Fundulus. The family Bucephalidae is named for the dis- tinctive "ox-head" appearance of the cercarial stage. It is basically furcocercous but with con- tractile furcae resembling horns attached to a wider-than-long modification of the tail stem. Bucephalid cercariae have long been known to develop in branching sporocysts parasitizing the visceral mass of both marine and freshwater bi- valve molluscs. Reports of such infections from marine and estuarine waters of the Gulf of Mex- ico have been summarized recently (Wardle, 1988). Described below are 4 new cercariae from those waters in the Galveston Bay area, Texas. Some, or perhaps all 4, may be larvae of species whose adults have been named and described. For that reason, the 4 are designated as buceph- alid cercaria A, bucephalid cercaria B, etc., in- stead of giving each a formal species name that would disappear as a junior synonym should life- history studies reveal the adult to be a previously named species. Besides the distinctive tail, bucephalid cercar- iae have in common bodies with features whose presence need not be repeated in each descrip- tion: a ventral mouth leading directly into the pharynx, followed by a rhabdocoele intestine; an anterior rhynchus independent of the digestive system; and a mesostomate excretory system, each side with a common tubule receiving a pos- terior and anterior collecting tubule, and entering a tubular to saccate bladder at a distance from its anterior end. Drawings were made from living specimens stained with neutral red and observed under moderate pressure. All measurements, expressed in micrometers, were from 10 naturally emerged cercariae that were heat killed and mounted without coverslip pressure. For whole mounts, specimens were fixed in formalin-acetic acid- alcohol and stained with carmine.

Some digeneans of the neotropical turtle genus Rhinoclemmys in Mexico and South America.

Abstract: Determination de nouvelles localisations geographiques et de nouveaux hotes de 4 digeniens trouves chez R. aerolata, R. nasuta, et R. punctularia

Gastrointestinal parasites of the blue catfish (Ictalurus furcatus) in Kentucky Lake, Tennessee.

Abstract: Presentation de 8 parasites gastrointestinaux infectant I. furcatus. Correlation entre l'espece du parasite impliquee dans l'infection et l'âge et la taille de l'hote

Reduction of the Syphacia sp. infection in the laboratory rat by viprostol treatment.

Abstract: Influence d'un traitement au Viprostol sur le potentiel infectieux de Syphacia chez le rat de laboratoire en correlation avec des variations gastrointestinales dues a l'alimentation de l'hote