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Morfologia do sistema muscular e do sistema reprodutor de Anisancylus obliquus (Broderip & Sowerby) do Chile, como contribuição à sistemática de Ancylidae (Gastropoda, Pulmonata, Basommatophora)

Morphology of the muscular and reproductive systems of Anisancylus obliquus (Broderip & Sowerby) from Chile as a contribution to the systematics of Ancylidae (Gastropoda, Pulmonata, Basommatophora)

Resumo

A study on the morphology of the muscular and reproductive systems of Anisancylus obliquus (Broderip & Sowerby, 1832) based on specimens from Chile is presented. Differences are observed in the number of folicules of the ovotestis and prostata when comparing them with specimens from Brazil (chilean specimens: ovotestis = 28 to 32; prostata = 3 to 5; brazilian specimens: ovotestis = 20 to 21; prostata = 6 to 8). In the muscular system, the right aductor muscle scar is often longer than in brazilian specimens. The general morphology of muscular and reproductive systems is similar to that observed to Uncancylus concentricus (d'Orbigny, 1835) and Gundlachia dutrae Santos, 1994 (V-shaped adhesive area; single right anterior muscle with elongated moon-shaped scar; ejaculatory complex with projected ejaculatory duct) and differs from G. ticaga (Marcus & Marcus, 1962), G. radiata (Guilding, 1828) and Hebetancylus moricandi (d'Orbigny, 1837) (elongated adhesive area; double right anterior muscle with rounded or oval-shaped muscle scar and ejaculatoiy complex without projected ejaculatory duct). Differences are also observed when comparing them with Ancylus fluviatilis Müller, 1774 where the right muscle scar is continuous with the posterior one, whereas A. obliquus shows three well defined muscle scars. The ejaculatory system of A. fluviatilis presents flagellum duct and ejaculatory duct opening apart into the sheath; there are penis, prepuce with muscular pillars and a muscular flagellum, whereas A. obliquus shows the flagellum duct and ejaculatory duct reaching the sheath together; there are not penis and muscular pillars on prepuce; the flagellum is glandular. These differences shows A. obliquus and others neotropical pateliforms basommatophorans are not closely related to european Ancylus.

Basommatophora; Ancylidae; Anisancylus obliquus; morphology; Chile


Basommatophora; Ancylidae; Anisancylus obliquus; morphology; Chile

Morfologia do sistema muscular e do sistema reprodutor de Anisancylus obliquus (Broderip & Sowerby) do Chile, como contribuição à sistemática de Ancylidae (Gastropoda, Pulmonata, Basommatophora)

Morphology of the muscular and reproductive systems of Anisancylus obliquus (Broderip & Sowerby) from Chile as a contribution to the systematics of Ancylidae (Gastropoda, Pulmonata, Basommatophora)

Sonia Barbosa dos Santos

Laboratório de Malacologia, Departamento de Biologia Animal e Vegetal, Instituto de Biologia Roberto Alcântara Gomes, Universidade do Estado do Rio de Janeiro. Rua São Francisco Xavier 524, 20550-900 Rio de Janeiro, Rio de Janeiro, Brasil. E-mail: sbsantos@uerj.br

ABSTRACT

A study on the morphology of the muscular and reproductive systems of Anisancylus obliquus (Broderip & Sowerby, 1832) based on specimens from Chile is presented. Differences are observed in the number of folicules of the ovotestis and prostata when comparing them with specimens from Brazil (chilean specimens: ovotestis = 28 to 32; prostata = 3 to 5; brazilian specimens: ovotestis = 20 to 21; prostata = 6 to 8). In the muscular system, the right aductor muscle scar is often longer than in brazilian specimens. The general morphology of muscular and reproductive systems is similar to that observed to Uncancylus concentricus (d'Orbigny, 1835) and Gundlachia dutrae Santos, 1994 (V-shaped adhesive area; single right anterior muscle with elongated moon-shaped scar; ejaculatory complex with projected ejaculatory duct) and differs from G. ticaga (Marcus & Marcus, 1962), G. radiata (Guilding, 1828) and Hebetancylus moricandi (d'Orbigny, 1837) (elongated adhesive area; double right anterior muscle with rounded or oval-shaped muscle scar and ejaculatoiy complex without projected ejaculatory duct). Differences are also observed when comparing them with Ancylus fluviatilis Müller, 1774 where the right muscle scar is continuous with the posterior one, whereas A. obliquus shows three well defined muscle scars. The ejaculatory system of A. fluviatilis presents flagellum duct and ejaculatory duct opening apart into the sheath; there are penis, prepuce with muscular pillars and a muscular flagellum, whereas A. obliquus shows the flagellum duct and ejaculatory duct reaching the sheath together; there are not penis and muscular pillars on prepuce; the flagellum is glandular. These differences shows A. obliquus and others neotropical pateliforms basommatophorans are not closely related to european Ancylus.

Key words: Basommatophora, Ancylidae, Anisancylus obliquus, morphology, Chile

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AGRADECIMENTOS. Aos pesquisadores citados, cujo apoio foi inestimável para as coletas realizadas no Chile: Dra. Cecilia Osorio, da Universidad de Chile, em Santiago; Drs. José Stuardo e Claudio Valdovinos, da Universidad de Concepción; Dr: José Artigas, do Museu de Zoologia da Universidade de Concepción e Dr. José Gallardo, da Universidad Austral de Chile, em Valdivia. Ao Biólogo Oscar Galvez H. e ao Dr: Sérgio Letelier V., do Museu Nacional de História Natural de Santiago, por disponibilizarem a coleção de ancilídeos para estudos.

Recebido em 18.11.1999; aceito em 13.XII.2000.

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Datas de Publicação

  • Publicação nesta coleção
    30 Abr 2009
  • Data do Fascículo
    Dez 2000

Histórico

  • Aceito
    13 Dez 2000
  • Recebido
    18 Nov 1999
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