Biomphalaria prona (Gastropoda: Planorbidae): a morphological and biochemical study
Mem. Inst. Oswaldo Cruz
;
87(2): 171-9, abr.-jun. 1992. tab, ilus
Article
in English
| LILACS
| ID: lil-116301
RESUMO
Two samples of Biomphalaria prona (Martens, 1873) from Lake Valencia (type locality) and seven from other Venezuelan localities were studied morphologically (shell and reproductive system) and biochemically (allozyme electrophoresis). In spite of marked differences in shell characters, all of them proved indistinguishable under the anatomic and biochemical criteria. So far B. prona has been considered an endemic species, restricted to Lake Valencia. It is now demonstrated that the extralacustrine populations refered to Biomphalaria havanensis (Pfeiffer, 1839) by several authors correspond in shell characters to an extreme variant of B. prona from the Lake and really belong to the last*mentioned species. They may be regarded as the result of a process of directional selection favoring a shell phenotype other than those making up the modal class in the Lake.
Full text:
Available
Index:
LILACS (Americas)
Main subject:
Biomphalaria
Limits:
Animals
Country/Region as subject:
South America
/
Venezuela
Language:
English
Journal:
Mem. Inst. Oswaldo Cruz
Journal subject:
Tropical Medicine
/
Parasitology
Year:
1992
Type:
Article
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