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Abstract:

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 lineata and Gambusia affinis as the second intermediate hosts; chicks served as experimental definitive hosts for both trematodes. Excysted metacercariae and adults of both species are morphologically indistinguishable, although some statistically significant differences were found in the following measurements of adults specimens: body length, ventral sucker length and width, the distance between the anterior extension of the vitellaria and the anterior border of the ventral sucker, and egg length. Everted gonotyls in vivo show differences in the size and number of papillae. Cercaria of Ascocotyle secunda can be differentiated from that of A. tertia in granulation and size of penetration glands, the presence or absence of a terminal spine, and lateral tegumental thickening of the tail. Metacercarial cysts differ in the thickness of cyst wall. Adults of both species are morphologically similar to A. (A.) tenuicollis and A. (A.) puertoricensis in possessing double rows of 32 circumoral spines (16 in each row), short intestinal caeca and a foliaceous, transversally oval gonotyl. However, they can be distinguished by their larval stages.

Registro:

Documento: Artículo
Título:Life cycles of two new sibling species of Ascocotyle (Ascocotyle) (Digenea, Heterophyidae) in the Neotropical Region
Autor:De Núñez, M.O.
Filiación:Depto. de Ciencias Biológicas, Fac. de Ciencias Exactas y Naturales, Pabellón II, 1428 Buenos Aires, Argentina
Palabras clave:Ascocotyle; Digenea; Heterophyidae; Life cycle; Sibling species
Año:2001
Volumen:46
Número:2
Página de inicio:119
Página de fin:129
Título revista:Acta Parasitologica
Título revista abreviado:Acta Parasitol.
ISSN:12302821
CODEN:ACTPE
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_12302821_v46_n2_p119_DeNunez

Referencias:

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Citas:

---------- APA ----------
(2001) . Life cycles of two new sibling species of Ascocotyle (Ascocotyle) (Digenea, Heterophyidae) in the Neotropical Region. Acta Parasitologica, 46(2), 119-129.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_12302821_v46_n2_p119_DeNunez [ ]
---------- CHICAGO ----------
De Núñez, M.O. "Life cycles of two new sibling species of Ascocotyle (Ascocotyle) (Digenea, Heterophyidae) in the Neotropical Region" . Acta Parasitologica 46, no. 2 (2001) : 119-129.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_12302821_v46_n2_p119_DeNunez [ ]
---------- MLA ----------
De Núñez, M.O. "Life cycles of two new sibling species of Ascocotyle (Ascocotyle) (Digenea, Heterophyidae) in the Neotropical Region" . Acta Parasitologica, vol. 46, no. 2, 2001, pp. 119-129.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_12302821_v46_n2_p119_DeNunez [ ]
---------- VANCOUVER ----------
De Núñez, M.O. Life cycles of two new sibling species of Ascocotyle (Ascocotyle) (Digenea, Heterophyidae) in the Neotropical Region. Acta Parasitol. 2001;46(2):119-129.
Available from: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_12302821_v46_n2_p119_DeNunez [ ]