Biomphalaria prona (Gastropoda: Planorbidae): a morphological and biochemical study

Memórias do Instituto Oswaldo Cruz

W. Lobato Paraense¹  J. P. Pointier²  B. Delay¹  A. F. Pernot¹  R. N. Incani¹  C. Balzan¹  P. Chrosciechowski¹ 

[1] ,École Pratique des Hautes Centre de Biologie Tropicale Laboratoire de Biologie Marine et MalacologiePerpignan,France

关键词: Gastropoda Planorbidae;    Biomphalaria prona;    Biomphalaria havanensis;    morphology;    allozymes;    Venezuela;   

DOI  :  10.1590/S0074-02761992000200001

来源: SciELO

【 摘 要 】

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.

【 授权许可】

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