Laboratorio Of Helmintologia

La Plata, Argentina

Laboratorio Of Helmintologia

La Plata, Argentina
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De Nunez M.O.,Laboratorio Of Helmintologia | Davies D.,National University of Salta | Spatz L.,Laboratorio Of Helmintologia
Revista Mexicana de Biodiversidad | Year: 2011

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 musculus (Linnaeus, 1758). Egg development lasted for 15-23 days at 23-24 C, and 10-12 days at 28-30 C; it was delayed after successive passages through mice, and ceased thereafter. In the snail, sporocysts, located beneath the mantle border, occurred up to 37 days post exposure (PE). Rediae invaded the entire snail body; developing ccrcarial bodies within rediae were recognized by the presence of a short tail, excretory canals, and eye-spot pigment. Cercariae emerged from snails as early as 20-26 days PE, encysting immediately on any substrate. These can be easily differentiated from those of Paramphistomum Fischoeder, 1901 spp. and Cotylophoron Stiles and Goldberger, 1910 spp., which have lateral excretory tubes forming a ring at the midlevel of the body and usually lack pharyngeal appendages. Metacercariae were infective for at least 6 months. Mature adults were observed 27-32 days PE in mice and 35 days PE in chicks. Biomphalaria tenagophila represents a new intermediate natural host record and Salta Province a new geographic area; Dendrocygna viduata (Linnaeus, 1766) and D. bicolor (Vieillot, 1816) from Venezuela are new host records for Z. lunata.


PubMed | Laboratorio Of Helmintologia and Federal University of Rio Grande do Sul
Type: | Journal: Veterinary parasitology | Year: 2016

This study presents a new method for visualization of Oxyuris equi eggs collected by means of a clear adhesive tape applied to the perianal region of horses. The obtained results indicate that this protocol permits a quick, easy, clear and selective visualization of Oxyuris equi eggs even in the presence of feces and other material. Another advantage of this method is that it can be used with fluorescent dyes solubilized in water, which will stain biologic material without dissolving or altering the adhesive tape and is also environmentally safe. Other dyes currently used for staining biologic materials use organic solvents, which may be combined with acids or bases in their formulation, preventing their use with the tape method.


De Chambrier A.,Museum dHistoire Naturelle | Gil De Pertierra A.,Laboratorio Of Helmintologia
Revue Suisse de Zoologie | Year: 2012

A new species of Ophiotaenia, O. oumanskyi sp. n., is described from the intestine of the frog, Lepidobatrachus laevis (Anura: Leptodactylidae), from Paraguay. Among the 10 species of Ophiotaenia found in anurans of the Neotropical Region, only O. bonariensis Szidat & Soria, 1954 and O. ecuadoriensis Dyer, 1986 possess an apical organ, whereas it is absent in the 8 other species. O. bonariensis differs from O. oumanskyi by the total length of the strobila (400-500 mm versus 50-96 mm) and by the number of testes (120-140 versus 85-119). O. ecuadoriensis differs of O. oumanskyi by the total lenght of strobila (29 mm versus 50-96 mm), by the position of the vagina to cirrus-sac (posterior versus anterior and posterior) and by the diameter of the embryophore (23-26 versus 30). Proteocephalus bufonis Chandra & Gupta, 2007 becomes Proteocephalus chandrae nom. nov. (to avoid homonymy with Proteocephalus bufonis Vigueras, 1942). Proteocephalus chandrae nom. nov. is transferred to Ophiotaenia and becomes Ophiotaenia chandrae n. comb.


Neoechinorhynchus (Hebesoma) colastinense sp. n. is described from the intestine of Pachyurus bonariensis a freshwater fish from Parana River basin. The new species is characterized by having a cylindrical trunk, elongated but swollen anteriorly; a spherical proboscis with a prominent apical organ; the anterior circle of hooks very large, alternating in 2 levels, separated from more posterior circles of hooks, but sometimes surpassing the hooks of the middle and posterior circles; a relatively long neck; the male reproductive system occupying 78-81% (79%) of the trunk length; the female reproductive system occupying 27-39% (32%) of the trunk length; and eggs elongated with polar prolongation of the fertilization membrane. Members of the species can be distinguished easily from the other species of South American Neoechinorhynchus Stiles & Hassall, 1905 because they are the only ones with characteristics of the subgenus Hebesoma. Additionally, two other species are recorded for the first time in Argentina: Neoechinorhynchus {Neoechinorhynchus) macro-nucleatus Machado Filho, 1954 from Lycengraulis grossidens and N. (N) pimelodi Brasil-Sato & Pavanelli, 1998 from several species of Pimelodus. The presence of an apical organ at the proboscis tip is recorded in the new species and N. (N.) macronucleatus. Studies using scanning electron microscopy revealed the presence of non-rimmed pores in the tegument throughout the trunk, neck and proboscis of all three species. A key to the South American species of Neoechinorhynchus is provided.


Lunaschi L.I.,Laboratorio Of Helmintologia | Drago F.B.,Laboratorio Of Helmintologia
Check List | Year: 2010

The aim of this paper is to increase the knowledge on the diversity of digenean parasites in ophidians and anurans from northeastern Argentina. Specimens of the snakes Eunectes notaeus, Hydrodynastes gigas, Micrurus corallinus, Philodryas sp. and Sibynomorphus sp., and the anurans Rhinella schneideri, Phyllomedusa azurea and Leptodactylus latrans were examined. Twelve digenean species were identified: Catadiscus corderoi Mañe ́-Garzo ́n, 1958, Catadiscus dolichocotyle (Cohn, 1903), Catadiscus uruguayensis Freitas & Lent, 1939, Choledocystus elegans (Travassos, 1926), Gorgoderina parvicava Travassos, 1922, Haplometroides buccicola Odhner, 1911, Heterodiplostomum lanceolatum Dubois, 1936, Infidum similis Travassos, 1916, Mesocoelium monas (Rudolphi, 1819), Plagiorchis luehei (Travassos, 1927), Telorchis clava (Diesing, 1850) and Travtrema stenocotyle (Cohn, 1902). New host species and/or new locality records from Argentina are presented. © 2010 Check List and Authors.


Drago F.B.,Laboratorio Of Helmintologia | Lunaschi L.I.,Laboratorio Of Helmintologia | Schenone M.,Laboratorio Of Helmintologia
Check List | Year: 2011

Thirteen specimens of Phalacrocorax brasilianus (Gmelin, 1789) from three areas of the Chaqueña Subregion of Argentina were examined for digeneans. Ten species were found: four diplostomids (Austrodiplostomum mordax, A. ostrowskiae, Tylodelphys adulta and Hysteromorpha triloba), three echinostomatids (Drepanocephalus spathans, Paryphostomum segregatum, and P. parvicephalum), one strigeid (Strigea falconis brasiliana), one psilostomid (Ribeiroia ondatrae) and one prosthogonimid (Prosthogonimus ovatus). Tylodelphys adulta and S. f. brasiliana are reported for the first time as parasites of P. brasilianus and new geographical records are presented. © 2011 Check List and Authors.


The helminth communities of silverside, Odontesthes bonariensis (Valenciennes, 1835), from two Argentinean lagoons were studied and compared at component community and infracommunity levels. Nine helminth species were found: five digeneans (Austrodiplostomum cf. mordax, Ascocotyle (Phagicola) cf. diminuta, Ascocotyle sp., Thometrema bonariensis and Saccocoelioides sp.); two nematodes (Contracaecum sp. and Hysterothylacium sp.); one acanthocephalan (Wolffhugelia matercula) and one cestode (Cangatiella macdonaghi). Odontesthes bonariensis is a new host record for five parasite species. Richness, diversity and number of helminths in silversides from Salada Grande lagoon were higher than in those from Lacombe lagoon. This could be related with lagoon size, abundance of mollusks and fish-eating birds, and size and diet of silversides captured in each lagoon. In Salada Grande lagoon the helminth community of silversides was dominated by the allogenic and generalist species A. cf. mordax; while the autogenic and intermediate specialist species C. macdonaghi was dominant in Lacombe lagoon. Host sex did not affect richness, diversity or total abundance, whereas host size was positively correlated with these attributes, except diversity in Salada Grande lagoon.


Lunaschi L.I.,Laboratorio Of Helmintologia | Drago F.B.,Laboratorio Of Helmintologia
Helminthologia | Year: 2010

Summary: Centrorhynchus guira n. sp. is described from the guira cuckoo, Guira guira (Gmelin) (Cuculiformes: Cuculidae), from Argentina. This new species is characterized by the proboscis armament with 32 longitudinal rows (29 with 18 hooks per row and 3 with 19 hooks per row) and by the following hook pattern per row: 8 - 9 true hooks, 4 transitional hooks with lateral alate processes, and 6 spiniform hooks. The presence of transitional hooks is shared with five other Neotropical species in the genus: C. polymorphus, C. albidus, C. microcephalus, C. kuntzi and C. crotophagicola. Among these species, C. guira n. sp. most closely resembles C. kuntzi in having transitional hooks with lateral alate processes, however differs in the number of hooks per row and spiniform hooks. This is the first record of the genus Centrorhynchus parasitizing Argentinean birds. A key to the species of the Neotropical Centrorhynchus Lühe 1911 is presented. © 2010 Parasitological Institute of SAS.


Drago F.B.,Laboratorio Of Helmintologia | Lunaschi L.I.,Laboratorio Of Helmintologia
Revista Mexicana de Biodiversidad | Year: 2011

The helminthological survey of 13 specimens of 5 ciconiiform species revealed the presence of 10 species of intestinal digeneans: Sphincterodiplostomum musculosum Dubois, 1936 in Ttgrisoma lineatum and Ardea alba; Tylodelphys elongata (Lutz, 1928) in T. lineatum; Apharyngostrigea ardearum (Lutz, 1928) and Dolichorchis lacombeensis Lunaschi and Drago, 2006 in Ardea cocoi and Ardea alba; Posthodiplostomum nanum Dubois, 1937 in A. alba and T. lineatum; Ascocotyle diminuta (Stunkard and Haviland, 1924) in A. alba; Petasiger sp.1 in A. cocoi and Paryphostomum segregatum Dietz, 1909, Strigea vaginata (Brandes, 1888) and Petasiger sp. 2 in Coragyps atratus. Syrigma sibilatrix was free of digeneans. The reports of A. ardearum, T. elongata, S. musculosum and D. lacombeensis represent new host records; the other reports are new geographical records. Moreover, the specimens described as Apharyngostrigea brasiliana Szidat, 1929 by Labriola and Suriano (1998) were analyzed and transferred to A. ardearum.


Lunaschi L.I.,Laboratorio Of Helmintologia | Drago F.B.,Laboratorio Of Helmintologia
Zootaxa | Year: 2011

Anenterotrema Stunkard, 1938 is revised and a key to its recognized species is presented. Anenterotrema auritum Stunkart, 1938 (type-species), A. eduardocaballeroi (Freitas, 1960) Caballero, 1960, A. liliputianum (Travassos, 1928) Caballero, 1964, A. stunkardi Caballero & Grocott, 1959 and A. mesolecitha Marshall & Miller, 1979 are redescribed based on their type material. Anenterotrema singulare Stunkart, 1938 is considered a synonym of A. auritum, A. freitasi Caballero, 1964 and A. auritum of Zdzitowiecki & Rutkowska (1980) synonyms of A. eduardocaballeroi, and A. eduardocaballeroi of Castiblanco & Vélez (1982) conspecific with A. stunkardi. © 2011 Magnolia Press.

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