首页> 外文期刊>Journal of Molluscan Studies >Sexual dimorphism in shells of the southwestern Atlantic gastropod Olivella plat a (Ihering, 1908) (Gastropoda: Olividae)
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Sexual dimorphism in shells of the southwestern Atlantic gastropod Olivella plat a (Ihering, 1908) (Gastropoda: Olividae)

机译:西南大西洋腹足动物纲Olivella plat a(Ihering,1908)的贝壳中的性二态性(Gastropoda:Olividae)

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Most known cases of sexual dimorphism in molluscs are based on size differences, where female shells are usually larger than males (e.g. Morse, 1876). Despite some striking examples of this, such as the cephalopod Argonauta or the puelche oyster (Pascual et al., 1989), for gastropods the differences are not quite as marked. For example, in the common southwestern Atlantic nassariid, Buccinanops monilifer (Kiener, 1834), male size varies between 20.3 and 36.8 mm shell length, while mature females range between 31.0 and 49.5 mm (Simone, 1996: 97). This pattern is seen in species of Eulimidae (Waren, 1983), Cypraeidae (Griffiths, 1961; Schilder & Schilder, 1962), Cassidae (Clench & Abbott, 1943) and Strombidae (Abbott, 1949). In the latter family, Lambis is an interesting case in which males are normally smaller than females, but they also possess two smaller knobs on the shoulders of the last whorl, whereas females have a longer, single, high knob. Additionally, spines of males are shorter and flatter (Ueno, 1997). Other known cases of sexual dimorphism in gastropods include differences in radular teeth between males and females (Arakawa, 1958; Maes, 1966; Fujioka, 1982, 1984; Matthews-Gascon et al., 2005).
机译:软体动物中最常见的性二态性案例是基于大小差异,雌性壳通常比雄性大(例如Morse,1876)。尽管有一些引人注目的例子,例如头足类动物Argonauta或牡蛎牡蛎(Pascual等人,1989),但腹足类动物的差异并不十分明显。例如,在西南大西洋常见的鼻中,Buccinanops monilifer(Kiener,1834),雄性的壳长在20.3至36.8 mm之间,而成年的雌性在31.0至49.5 mm之间(Simone,1996:97)。这种模式见于Eulimidae(Waren,1983),Cypraeidae(Griffiths,1961; Schilder&Schilder,1962),Cassidae(Clench&Abbott,1943)和Strombidae(Abbott,1949)的物种中。在后者的家庭中,兰比斯是一个有趣的案例,雄性通常比雌性小,但在最后一个螺纹的肩上还具有两个较小的花s,而雌性则具有较长的单高结。另外,雄性棘刺较短而扁平(Ueno,1997)。腹足动物中性二态性的其他已知情况包括雄性和雌性的球状齿的差异(Arakawa,1958; Maes,1966; Fujioka,1982,1984; Matthews-Gascon等,2005)。

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