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DEVELOPMENT OF EMBRYONIC AND NAUPLIAR SETAE AND SPINES AND THEIR ROLE IN HATCHING IN THE PENAEID SICYONIA INGENTIS: A LIGHT AND ELECTRON MICROSCOPIC STUDY

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ABSTRACT Zygotes of the ridgeback prawn Sicyonia ingentis cultured in the laboratory hatch within 19 h of spawning. At hour 15, 4 small setae form at the tips of the developing appendages. By hour 17.5, 2 caudal spines appear; the setae, by then greatly increased in number, grow to occupy the space between the distal posterior part of the embryo and the hatching envelope. With the initiation of setal growth, setal length was used to determine larval age. Hatching was initiated by the penetration of the caudal spines through the hatching envelope 18.5-19.0 h postspawn. After shedding the hatching and accompanying embryonic envelopes, the larva emerges from the egg within an "exoskeletal" envelope. The embryo escapes from this envelope by either flexing its antennal appendages to split the envelope from the anterior end, or by piercing it with the caudal spines and withdrawing posterior-end first. Studies of hatching using LM and SEM confirmed that in either case the new setae are withdrawn through small holes made at the tips of the appendages. Evidence from TEM studies suggest that most setal growth is initiated following the formation of the "exoskeletal" envelope. The role of spot desmosomes in the ultrastructure of the embryonic setae is postulated.

10.2307/1548543
/content/journals/10.2307/1548543
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10
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/content/journals/10.2307/1548543
2017-09-25

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