Reproduction
Turbo undulatus are gonochoristic with separate sexes and fertilization is external. In gastropods, the left gonad has ben lost and only the right gonad is present. The single gonad in the upper whorls is closely associated with the digestive gland (Beechey,1998). In primitive gastropods, the gonad contains a coleomic space, the gonocoel, and is connected to the outside by a coelomoduct or modified metanephridium, the gonoduct. In derived gastropods, the original gonoduct has become more complex, consisting of a structure called the genetial duct, only which part of it is the original gonoduct (Rupert, Fox and Barnes, 2003).
The gonad, either ovaries or testis, is located at in the spirals of he visceral mass near the digestive cecum, ad gametes are delivered to the mantle cavity by the genital duct. The gametes are released from the gonoduct into the right nephridium and is delivered into the right by it into the mantle cavity. The eggs are provided with gelatinous envelopes produced by the ovary or he nephridium. No copulation is involved and external fertilization occurs in the sea after the gametes are swept out of the mantle cavity by the respiratory current (Rupert, Fox and Barnes, 2003).
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