Scientia Marina, Vol 69, No 2 (2005)

Spawn and larval development of Pleuroploca aurantiaca (Lamarck, 1816) (Gastropoda: Fasciolariidae) from Northeast Brazil


https://doi.org/10.3989/scimar.2005.69n2199

Carlos A. O. Meirelles
Departamento de Engenharia de Pesca, Mestrado em Engenharia de Pesca, Universidade Federal do Ceará - Departamento de Biologia, Laboratório de Malacologia, Universidade Federal do Ceará, Brazil

Helena Mattews-Cascon
Departamento de Biologia, Laboratório de Malacologia, Universidade Federal do Ceará, Brazil

Abstract


Spawn and larval development stages of Pleuroploca aurantiaca from northeast Brazil are described. The reproductive period lasted from August to December, with a peak in November. Spawn masses were composed of 29 ± 3 vase-shaped capsules which measured 9 ± 1 mm (n = 30) in length and 4.5 ± 0.5 mm (n = 30) in width. The exit plug was located on the apical area and measured 2.5 ± 0.5 mm (n = 30) in diameter. Each capsule had 353 ± 59 (n = 10) eggs that measured 240 ± 1 µm (n = 15) in diameter. On the tenth day, the intracapsular veliger stage was observed. The intracapsular pediveliger stage was observed on the twenty first day, when the individuals had a functional foot and a reduced velum. Hatching occurred on the thirtieth day, when the early juvenile measured 3 to 5 mm in length and there was no remaining velum. Only 1% of the eggs developed to the hatching stage. The rest were nurse eggs used by embryos as a food resource. Pleuroploca aurantiaca has an intracapsular metamorphosis development type.

Keywords


reproduction; development; Mollusca; Fasciolariidae; Pleuroploca; Pleuroploca aurantiaca

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