Life cycles of two new sibling species of Ascocotyle (Ascocotyle) (Digenea, Heterophyidae) in the Neotropical Region
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 atherini...
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2001
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_12302821_v46_n2_p119_DeNunez http://hdl.handle.net/20.500.12110/paper_12302821_v46_n2_p119_DeNunez |
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paper:paper_12302821_v46_n2_p119_DeNunez2023-06-08T16:10:08Z Life cycles of two new sibling species of Ascocotyle (Ascocotyle) (Digenea, Heterophyidae) in the Neotropical Region Ascocotyle Digenea Heterophyidae Life cycle Sibling species 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. 2001 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_12302821_v46_n2_p119_DeNunez http://hdl.handle.net/20.500.12110/paper_12302821_v46_n2_p119_DeNunez |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Ascocotyle Digenea Heterophyidae Life cycle Sibling species |
| spellingShingle |
Ascocotyle Digenea Heterophyidae Life cycle Sibling species Life cycles of two new sibling species of Ascocotyle (Ascocotyle) (Digenea, Heterophyidae) in the Neotropical Region |
| topic_facet |
Ascocotyle Digenea Heterophyidae Life cycle Sibling species |
| description |
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. |
| title |
Life cycles of two new sibling species of Ascocotyle (Ascocotyle) (Digenea, Heterophyidae) in the Neotropical Region |
| title_short |
Life cycles of two new sibling species of Ascocotyle (Ascocotyle) (Digenea, Heterophyidae) in the Neotropical Region |
| title_full |
Life cycles of two new sibling species of Ascocotyle (Ascocotyle) (Digenea, Heterophyidae) in the Neotropical Region |
| title_fullStr |
Life cycles of two new sibling species of Ascocotyle (Ascocotyle) (Digenea, Heterophyidae) in the Neotropical Region |
| title_full_unstemmed |
Life cycles of two new sibling species of Ascocotyle (Ascocotyle) (Digenea, Heterophyidae) in the Neotropical Region |
| title_sort |
life cycles of two new sibling species of ascocotyle (ascocotyle) (digenea, heterophyidae) in the neotropical region |
| publishDate |
2001 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_12302821_v46_n2_p119_DeNunez http://hdl.handle.net/20.500.12110/paper_12302821_v46_n2_p119_DeNunez |
| _version_ |
1768543623486373888 |