Margarita Ostrowskide Núñez

University of Buenos Aires | UBA · Biological Sciences Department

We describe the alloglossiid trematode Magnivitellinum saltaensis n. sp., a parasite of the characiform fish Psalidodon endy, and its life cycle from Salta, northwest of Argentina. This is the first life cycle described for a species belonging to the genus Magnivitellinum. Cercariae emerged naturally from Biomphalaria tenagophila snails and infecte...

Here we describe a new heterophyid species, Heterophyes yacyretana n. sp., and resolve its life cycle experimentally. We found the prosobranch snail Aylacostoma chloroticum in Candelaria, Province of Misiones, Argentina (a sector of the High Parana´ River affected by the Yacyreta´ Dam), naturally infected with opisthorchioid cercariae. These cercar...

Adults of the genus Austrodiplostomum are parasites in cormorants of the New World, whereas metacercariae are parasites from eye globe and brain of freshwater and brackish water fishes. In this study, specimens of Austrodiplostomum mordax from South America (type-species) were analyzed together with other specimens of Austrodiplostomum spp. collect...

Austrodiplostomum compactum from Nannopterum brasilianus, and its metacercaria from Geophagus sp. and Oreochromis mossambicus captured (1979) at its type locality Valencia Lake, Venezuela, by the author, is redescribed. The adult is characterized by its large body size, and an oral sucker smaller than the pharynx. The metacercaria has a similar bod...

This work provides information on the occurrence of adult trematodes (Aspidogastrea and Digenea) in freshwater fishes from Argentina. To date, a total of 77 trematode species belonging to 21 families have been recorded. Haploporidae, Allocreadiidae and Cryptogonimidae (15, nine and nine species, respectively) showed the highest species richness, wh...

Larval trematodes infecting Biomphalaria tenagophila and B. occidentalis were surveyed in a suburban and semipermanent pond of Corrientes province, Northeastern Argentina. A total of 1,409 snails were examined between spring 2011 to winter 2013, and 8 different larval trematodes were studied morphologically. Three of these species–Echinocercaria sp...

The life cycle of Neocladocystis intestinalis (Vaz, 1932) was resolved experimentally. The prosobranchiate snail Aylacostoma chloroticum Hylton Scott (Thiaridae) collected in the Yacyretá Dam, Province of Misiones, Argentina, was found naturally infected with cercariae that possessed pigmented eye spots, 7 pairs of penetration glands, 12 pairs of f...

We provide a summary overview of the diversity of trematode parasites in freshwater fishes of the ‘New World’, i.e. the Americas, with emphasis on adult forms. The trematode fauna of three regions, South America, Middle America, and USA and Canada (North America north of Mexico), are considered separately. In total, 462 trematode species have been...

Resumen — Investigaciones realizadas previamente registraron metacercarias y adultos de Clinostomum marginatum en peces y aves de la provincia de Formosa. En esta nota se amplía la lista de hospedadores intermediarios secundarios y la distribución geográfica del género en Argentina, ya que se identificaron por primera vez metacercarias de Clinostom...

Species of Ribeiroia use planorbid snails as intermediate host. Since there is little information about these digenean parasites in South America, we aimed to assess whether Ribeiroia cercariae from 3 North Argentina locations belonged to the same species, and differed from Ribeiroia cercariae described elsewhere. Specimens were obtained from Biomp...

The species of larval Echinostomatidae that infect Biomphalaria straminea (Dunker, 1848) in a ricefield in Corrientes province, Argentina, were studied. Examination of 5 510 snails during 2 rice cultivation cycles, from December 2010 to May 2011 and from December 2011 to April 2012, revealed the presence of 3 new species: Echinocercaria sp. XIII, E...

Three keys to the species of Neolebouria Gibson, 1976, representing three body types, are provided based on the location of the genital pore relative to the intestinal bifurcation. These are: the lanceolata body type, where the genital pore is clearly prebifurcal; the diacopae body type, where the genital pore is located at or near the level of the...

Abstract ABSTRACT: Pseudosellacotyla lutzi (Freitas, 1941) at present included in the Faustulidae, is redescribed and its life cycle was resolved experimentally. The prosobranch snail Aylacostoma chloroticum Hylton Scott, (Thiaridae) collected in the Yacyretá Dam, Province of Misiones, Argentina, was found naturally infected with cercariae that lac...

A total of 3,494 snails from Biomphalaria straminea (Dunker, 1848) were collected from December 2010 to May 2011, in a ricefield in Corrientes province, Argentina, and 5 species of larval trematodes Furcocercaria sp. XVII (Diplostomidae), Furcocercaria sp. XVIII (Schistosomatidae), Furcocercaria sp. XV (?Strigeidae) Furcocercaria sp. XIV and Furcoc...

##Assembly-Data-START## Sequencing Technology :: Sanger dideoxy sequencing ##Assembly-Data-END##

A new species of cryptogonimid belonging to the genus Parspina Pearse, 1920 is described from the intestine of Pimelodella gracilis (Valenciennes) in the Paraná River basin, Argentina. Parspina pimelodellae n. sp. is characterised by having: (i) a body length/width ratio of 1:3.6-5.3 at the level of the ventral sucker; (ii) 21 oral spines; (iii) an...

Abstract Populations of Biomphalaria straminea, B. peregrina, B. tenagophila, B.orbignyi, and B. oligoza from different Argentine localities were exposed to miracidia of Schistosoma mansoni EC strain, and B. tenagophila in addition to SJ2 strain. Biomphalaria straminea and B. tenagophila displayed different susceptibility and compatibility (Frandse...

The life cycle of Australapatemon magnacetabulum Dubois, 1988 was resolved experimentally. Planorbid snails Biomphalaria tenagophila (d'Orbigny, 1835) collected in a small pond at the confluence of the San Lorenzo and Arias Rivers, near Salta City, Province of Salta, Argentina, were found to be shedding furcocercous cercariae possessing 4 pairs of...

Two new species of the cryptogonimid genus Parspina Pearse, 1920 are described from gymnotiform fishes of the Paraná River basin, P. carapo n. sp. from the banded knifefish Gymnotus carapo Linnaeus and P. virescens n. sp. from the glass knifefish Eigenmannia virescens (Valenciennes). Parspina carapo differs from P. virescens in the number of oral s...

The life cycle of the trematode Zygocotyle lunata (Diesing, 1836) is studied, beginning with cercariae from naturally infected Biomphalaria peregrina (d'Orbigny, 1835) and B. tenagophila (d'Orbigny, 1835) from Buenos Aires Province and Salta Province (Argentina), respectively. Adults were recovered from Gallus domesticus (Linnaeus, 1758) and Mus mu...

The life cycle of the trematode Zygocotyle lunata (Diesing, 1836) is studied, beginning with cercariae from naturally infected Biomphalariaperegrina (d'Orbigny, 1835) and B. tenagophila (d'Orbigny, 1835) from Buenos Aires Province and Salta Province (Argentina), respectively. Adults were recovered from Gallus domesticus (Linnaeus, 1758) and Mus mus...

The type-specimens of Parspina argentinensis (Szidat, 1954) from Pimelodus maculatus Lacépède, and new material from Iheringichthys labrosus (Lütken), Parapimelodus valenciennis (Lütken), Pimelodella gracilis (Valenciennes), Pimelodus albicans (Valenciennes), P. argenteus Perugia and P. maculatus caught in the basins of the La Plata and Paraná Rive...

The present study describes a new species, Ligophorus uruguayense, parasitizing the gills of Mugil platanus Günther, 1880 from the coast of Uruguay. It differs from all other species of the genus mainly in the shape of the ventral bar, the thick process at the distal end of the inner root of ventral anchors, the J-shaped penis accessory piece and t...

A new species, Stephanoprora aylacostoma is described and its life cycle was resolved experimentally. The prosobranch snail Aylacostoma chloroticum Hylton Scott, collected in the Yacyretá dam, Province of Misiones, Argentina, was found naturally infected with large-tailed cercariae possessing a prepharyngeal body and corpuscles in the excretory sys...

During a 1-year study period between March 2000 and 2001, 195 (6%) out of 3236 Sagitta friderici were found to be parasitized by metacercariae of digenean species and metacestodes. Parasites belonged to Derogenes sp., Ectenurus virgulus, Monascus filiformis, Lepocreadiidae, Parahemiurus merus and tetraphyllidean metacestodes. Among the chaetognaths...

The life cycle of Stephanoprora uruguayense Holcman et Olagüe, 1989, was experimentally resolved. In an artificial pond in the Zoological Garden in Buenos Aires City, Argentina, Heleobia parchappei (Hydrobiidae) was found to be releasing large-tailed cercariae with a prepharyngeal body, but lacking collar spines and corpuscles in the excretory syst...

The partial life cycle of an echinostomatid found in Lymnaea viatrix from Patagonia, Argentina, was experimentally clarified. Emerging cercariae were exposed to laboratory-reared specimens of Biomphalaria sp. Metacercariae obtained from both naturally and experimentally infected snails were force-fed to chicks. Specimens recovered from the chicks b...

The following chaetognaths were found in the Atlantic Ocean between 34 to 40 degrees S and 52 degrees 20' to 62 degrees 00' W: Sagitta friderici, S. tasmanica, S. minima, S. gazellae, and S. enflata (in order of abundance). Of these, only S. friderici was parasitised by unencysted metacercariae of the families Derogenidae (Derogenes sp.), Hemiurida...

Adult specimens of Stephanoprora uruguayense Holcman-Spector et Olagüe, 1989 were obtained experimentally by infect-ing chicks with cysts from the gills of Galaxias maculatus (Jenyns, 1842) from Andean Patagonian lakes. Specimens of this species were found in nature parasitising Larus dominicanus (Lichtenstein, 1823) in the same area. The species i...

Allocreadium pichi n. sp. (Trematoda: Allocreadiidae) is described from the intestine of Galaxias maculatus (Osteichthyes: Galaxiidae) from Moreno Lake in Patagonia, Argentina. This species is distinguished from A. patagonicum Shimazu, Urawa & Coria, 2000, the other species recorded in the area, by its smaller body size, the diagonal position of th...

Posterotestes gen. n. (Digenea: Apocreadiidae, Apocrcadiinae) is proposed for specimens with the following features: spiny body, posterior position of gonads, extension of vitelline follicles up to level of intestinal bifurcation and absent at post-testicular space, long oesophagus and extension of caeca up to anterior testis. Posterotestes unelen...

Biomphalaria peregrina was found to be naturally infected with cercariae of Zygocotyle lunata in a pond of the Zoological Garden of Buenos Aires. Mice and chicks were fed metacercariae and gravid adults recovered. Eggs recovered from mice feces were used for experimental infections. Laboratory-reared B. peregrina and 4 other Biomphaluria spp. were...

Distomum annulatum Diesing, 1850 is redescribed and placed into the genus Caballerotrema, as Caballerotrema annulatum comb.n. The type specimens are compared with paratypes of C. piscicola (Stunkard, 1960), C. arapaimense Thatcher, 1980 and C. aruanense Thatcher, 1980. Comments on C. brasiliense Prudhoe, 1960 and C. piscicola as described by Kohn &...

Distomum annulatum DIESING, 1850 is redescribed and placed into the genus Caballerotrema, as Caballerotrema annulatum comb.n. The type specimens are compared with paratypes of C. piscicola (STUNKARD, 1960), C. arapaimense THATCHER, 1980 and C. aruanense THATCHER, 1980. Comments on C. bras Mense PRUDHOE, 1960 and C. piscicola as described by KOHN &...

Some of the Biomphalaria species living in Chaco, such as B. straminea and B. tenagophila, are natural transmitters of schistosomiasis in Brazil, while those of the genus Drepanotrema are not intermediate hosts of the disease. The aim of the present work was to analyze the importance of a selected set of environmental variables in explaining patter...

Two sibling species of Ascocotyle (Ascocotyle), Ascocotyle (A.) secunda sp. nov. and Ascocotyle (A.) tertia sp. nov., are described on the basis of their life cycles in Argentina. Both taxa use the hydrobiid snails Heleobia castellanosae and H. parchappei as the first intermediate host, and atheriniform fishes Cnesterodon decemmaculatus, Jenynsia l...

Two species of Digenea are recorded from the intestine of Percichthys trucha (Percichthydae) from Patagonian water bodies. Polylekithum percai n. sp. (Allocreadiidae) is distinguished by its body size, the relative size of the suckers, the anterior extension of the vitelline fields, the number of eggs in the uterus and the different species of fish...

Steganoderma szidati n. sp. is described from the intestine of two freshwater fishes, Galaxias maculatus and G. platei (Galaxiidae), from Andean lakes in Patagonia, Argentina. This freshwater zoogonid species fits in the genus Steganoderma (sensu Bray, 1987) because of the length of the caeca and the position of the vitelline follicles. The new spe...

Acanthostomoides apophalliformis Szidat, 1956 is redescribed and its distribution, prevalence and mean intensity of infection in different Patagonian lakes is included. Mature adults were found mainly in the digestive tract of Percichthys trucha, rarely in Oncorhynchus mykiss and Diplomystes viedmensis (new host record). The metacercaria parasitise...

The molluscs Heleobia castellanosae and Ampullaria canaliculata and cichlid fishes were collected from an artificial pond at Tres de Febrero Park (Buenos Aires city), between June 1994 and May 1995. One hundred and eighty of 2,467 H. castellanosae examined were infected with pre-adults of Lobatostoma jungwirthi, 112 of them in concurrent infections...

Two types of metacercariae with 37 and 43 collar spines were obtained from Diplodon chilensis (Unionacea, Pelecypoda). They were fed to chicken and mice and mature adults with eggs were only obtained from the latter. These are described as a new species, Echinoparyphium megacirrus sp. n.

Stages of the life cycle of Ascocotyle (Phagicola) angeloi Travassos, 1928 were experimentally obtained, from cercariae from naturally infected Littoridina castellanosae (Gaillard) collected in artificial ponds in the Zoological Garden of Buenos Aires. Metacercariae were found encysted mainly in muscles and ovary, but also in other parts of the bod...

This paper continues others dedicated to digenea of rodents and is part of a global study on the parasitic fauna of Hydrochaeris hydrochaeris Linné. Twenty three specimens from de Delta were analized and their Notocotyloidea studied, i.e. Hippocrepis hippocrepis (Diesing, 1851) Travassos, 1922, Nudacotyle valdevaginatus Travassos, 1922, Nudacotyle...

The life cycle of Pygidiopsis australis sp. n. was reproduced experimentally, starting from cercariae from naturally infected Littoridina castellanosae (Hydrobiidae) collected from artificial ponds in the Zoological Garden in Buenos Aires. Metacercariae were found encysted in the mesenteries, internal organs and body cavity of experimentally expose...

The life cycle of Pygidiopsis crassus n. sp. was experimentally reproduced, starting from cercariae from naturally infected Littoridina parchappei collected from Lujan River and different ponds in Buenos Aires Province, Argentina. Metacercariae were found encysted in the body cavity of experimentally and naturally infected fishes Cnesterodon decemm...

The characteristics of the population dynamics of Posthodiplostomum nanum have been studied in two of its intermediate hosts, using prevalence, intensity and maturity of the metacercariae, considering the influence of the water temperature. In addition to this some ecological implications are described. There were made 18 samples monthly or bimonth...

The life-cycle of Ascocotyle (Phagicola) diminuta (Stunkard & Haviland, 1924) was reproduced experimentally, starting from cercariae from naturally infected Littoridina castellanosae and L. parchappei (Hydrobiidae) collected from artificial ponds in the Zoological Garden in Buenos Aires and from Los Ranchos stream, Buenos Aires Province, respective...

http://cat.inist.fr/?aModele=afficheN&cpsidt=4825591 [EN] From its type locality in Germany, Echinostoma revolutum (Froelich, 1802) Dietz, 1909 have cercariae with long cylindrical tails, and typical slender finger-like tips. The tail surface bears seven independent fin folds arranged in three pairs: proximal dorso-ventral, distal dorso-ventral and...

The life cycle of Ascocotyle (Leighia) hadra n.sp. was experimentally reproduced, starting from cercariae from naturally infected Littoridina parchappei, collected from Los Ranchos stream, near Mercedes city, Buenos Aires Province, Argentina. Metacercariae were found encysted in the liver and mesentery of experimentally and naturally infected fishe...

The life cycle of Ascocotyle (Leighia) hadra n. sp. was experimentally reproduced, starting from cercariae from naturally infected Littoridina parchappei, collected from Los Ranchos stream, near Mercedes city, Buenos Aires Province, Argentina. Metacercariae were found encysted in the liver and mesentery of experimentally and naturally infected fish...

The cercaria of Acanthostomum brauni penetrates the skin of its fish host in response to a combination of two chemical signals from the fish skin surface: free fatty acids and a macro-molecular mucus component. The latter seems to be a protein, as the penetration-stimulating activity of fish skin surface mucus is eliminated by digestion with protei...

Larval trematodes from Biomphalaria occidentalis collected once the three times per season during three years (1985-1988) were studied and Echinocercaria sp- VII (cf. Petasiger sp- ), Echinocercaria sp. II, a cercaria of Ribeiroia sp., Furcocercaria sp. III, and Xiphidiocercaria sp. V (cf. Cercaria lutzi Ruiz, 1943) were described. Undetermined not...

The first intermediate host is Littoridina parchappei; fishes of several species act as second intermediate hosts and the catfishes, Rhamdia sapo and Pimelodella laticeps serve as definite hosts. -from Authors

Three potential schistosome vectors were detected in ricefields, namely Biomphalaria straminea, B. tenagophila and B. peregrina, although B. orbignyi, a species refractory to infection with S. mansoni, proved the most frequent and abundant.

The chemical signals of the skin surface of fish, which stimulate the attachment responses of Acanthostomum brauni cercariae, were identified by offering chemicals and fish-skin extracts in agarose substrates to the cercariae. Smaller molecules such as amino acids, fatty acids, monosaccharides, electrolytes, urea, and carbonate solutions did not st...

In overflowed areas from the Lujan-River near Zelaya, province of Buenos Aires, Argentina, a xiphidiocercaria with stenostome excretory system and 2 [(4 + 4 + 4) + (4 + 4 + 4 +)] = 48 flame cells was found in Ampullaria canaliculata. The cercaria encyst experimentally in the skin and internal organs of tadpoles. Natural infections were found in Hyl...

With metacercariae encysted naturally in the visceral cavity of Megadytes glauca-larvae (Dityscidae), day old unfed chicken and a Belonopterus cayennensis were infected and adults of Stomylotrema vicarium Braun, 1901 obtained. Metacercariae and adults have an excretory bladder with lateral ramifications and 4 groups of 10, exceptionally 12 flame ce...

Studies on the freshwater fauna of Argentina. VII. Cercariae of the family Schistosomatidae. Two new schistosome cercariae are described: Cercaria I from Physa rivalis has small pigmented eye-spots, 5 pairs of unicellular glands, 6+1 pairs of flame cells, furcae with fin folds and attaches to the surface film in a characteristic position; Cercaria...

Calliobothrium verticillatum australis subsp. nov., Calliobothrium eschrichtii van Beneden, 1850, Calliobothrium lintoni Euzet, 1954 and Orygmatobotrium velamentum Yoshida, 1917 were found in the spiral valve of Mustelus schmitti Srpinger, 1939 and several differences with the original descriptions are mentioned.

The complete life cycle of Posthodiplostomum nanum Dubois, 1937 obtained experimentally is described. With metacercariae encysted naturally in the visceral cavity and kidneys of Phalloceros caudimaculatus and Cnesterodon decemmaculatus, day-old unfed chicken were infected and adults and viable eggs obtained. The sporocysts develop in the ancylid sn...

Calicotyle macrocotyle Cordero, 1944 (Trematoda, Monogenoidea) from the cloaca, Otodistomum pristiophori Johnston, 1902 (Trematoda, Digenea) from the coelom, Nybelinia sp. (Cestoda Tetrarhynchidea) and ?Phyllobothrium sp. from the intestine of Psammobatis microps (Günther), and Acanthobothrium zapterycum sp. nov. (Cestoda Tetraphyllidea), Echinobot...

The helminths from six vials in the Collection of the Natural History Museum, Vienna, were mounted as permanent preparations and the following species were found: Stephanoprora nattereri sp.n., Stephanoprora sp., Caballerotrema sp., Echinostoma sp., Pseudotelorchis caimanis CATTO & AMATO, 1993, Proctocaecum dorsale CATTO & AMATO, 1993, Acanthostomu...

Se describen las especies de Diplostomatidae: Austrodiplostomum mordax Szidat y Nani, 1951, Hysteromorpha triloba (Rudolphi, 1819) Lutz, 1931 y se describen las especies de Neodiplostomum spec. y Diplostomum (Dolichorchis) bonariensis n.sp., obtenidas de 17 ejemplares de biguá, Phalacrocorax b. brasilianus, provenientes de las provincias de Buenos...

Four species of Echinostomatidae, Paryphostomum segregatum Dietz, 1909, Paryphostomum fragosum (Dietz, 1909) Skrjabin 1956, Drepanocephalus spathans Dietz, 1909 and Ignavia olivacei Ostrowski de Núñez, 1967, and a species of Cathaemasidae, Ribeiroia ondatrae (Price, 1931) Price, 1942, from 14 Phalacrocorax o. olivaceus captured in Buenos Aires Prov...

A new species Ignavia olivacei of the kidney from Phalacrocorax o. olivaceus (Buenos Aires, Argentina) is described, and compared with Stephanoprora anomala Travassos, 1922 of the bursa fabrici from the same host in Brasil. It is suggested to include S. anomala in the genus Ignavia. The measurements and figures of the species included in Ignavia ar...