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Observations on the morphology of embryonic and larval development in Styela canopus Savigny

Acta Oceanologica Sinica 2003年第4期22卷 621-628页

作者： huang ying1,{1., feng danqing1, zhou shiqiang1, li fuxue1 1. department of oceanography, institute of subtropic oceanography, key laboratory for marine environmental science of the ministry of education, xiamen university, xiamen 361005, china department of {1. Institute of Subtropic Oceanography Key Laboratory for Marine Environmental Science of the Ministry of Education Xiamen University Xiamen 361005 China

The morphological characters on different developmental phases of embryo and larva and the schedule of the whole early developmental process in Styela canopus were observed and described. The types of reproduction and early development as well as the morphology, of egg and larva in different ascidian species were compared. Styela canopus is oviparous. Its egg, 230.4 similar to 336.0 mum in diameter, is equipped with extraembryonic cell layers measured 43.2 similar to 63.0 mum thick. The early development of Styela canopus is typical urodele development, including fertilization, cleavage, gastrulation, tadpole in membrane, tadpole, initiating metamorphosis and juvenile. The tadpole of Styela canopus, with a length of 0.6 similar to 0. 9 mm, consists of trunk and tail. There are obvious notochord, ocellus and adhesive papillae in the tadpole. Under the water temperature of (25 +/- 0-5) degreesC and the salinity of 27.0, the larva was hatched after 9.5 similar to 1..0 h since the fertilization.

关键词： Styela canopus embryo larvae tadpole larvae ascidian

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Settlement and metamorphosis of Styela canopus Savigny larvae in response to some neurotransmitters and thyroxin

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Acta Oceanologica Sinica 2006年第3期25卷 90-97页

作者： feng {1. huang ying ke caihuan zhou shiqiang li Shaojing key State {1. of marine environmental science Xiamen University Xiaman 361005 China department of {1. Xiamen University Xiamen 361005 China institute of {1. oceanography Xiamen University Xiamen 361005 China

The larvae of ascidian Styela canopus Savigny were treated with epinephrine, norepinephrine, L-DOPA, GABA and thyroxin to test the ability of these compounds to induce or inhibit larval settlement and metamorphosis. The results showed that epinephrine, norepinephrine and L-DOPA at the concentration of 1.μmol/dm^3 induced larval settlement and metamorphosis in S. canopus, with short exposure （ 1.h） to 1.μmol/dm^3 of L-DOPA inducing rapid settlement. In contrast, GABA at the concentrations of 0.1.～1.30.0 μmol/dm^3 significantly inhibited the settlement and metamorphosis of S. canopus larvae. In addition, thyroxin at 1.-50 μg/dm^3 had no effect on larval settlement and metamorphosis in S. canopus. These results suggest the importance of neurotransmitters in the settlement and metamorphosis of S. canopus larvae.

关键词： Styela canopus larvae settlement metamorphosis neurotransmitter thyroxin

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