Das Experiment: Entwicklung von <i>Ciona intestinalis</i> (L.) (Tunicata, Ascidiacea)

Groepler, Wolfgang

doi:10.1002/biuz.19830130107

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1989

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“…Recent descriptions of normal development in the oviparous Ciona intestinalis and the viviparous Clavelina lepadiformis have been published, along with series of colour photomicrographs by Groepler (1983Groepler ( , 1984). An excellent SEM-study on early morphogenetic stages of Halocynthia roretzi is available from Satoh (1978).…”

Section: Introductionmentioning

confidence: 99%

Fertilization and normal development inAscidiella aspersa (Tunicata) studied with Nomarski-optics

Niermann-Kerkenberg

Hofmann

1989

Helgolander Meeresunters

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Normal development of Ascidiella aspersa was studied over a period of approx. 24 h at 20 ~ from egg insemination through metamorphosis of the tadpole larva using Nomarski-optics. Records were made of spermatozoa attaching to and passing through the cellular envelopes and the chorion of the egg. Egg shape alterations upon entry of the fertilizing sperm, which reflect the early phase of ooplasmic segregation, were monitored in intact and dechorionated eggs. The time course of normal development was recorded, and prominent stages were photographed within or deprived of the egg envelopes. The present observations are compared with recent accounts on early development in other solitary ascidian species.

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Section: Introductionmentioning

confidence: 99%