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GRAVITY-DIRECTED ORIENTATION OF POSTGASTRULAR DEVELOPMENT AND EMERGENCE OF PRENAUPLII FROM CYSTS OF ARTEMIA (ANOSTRACA)

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ABSTRACT Prenauplii of brine shrimp hatched from cysts adhered to a stationary substratum emerged upward (from the top of the cyst) instead of randomly. The direction of light and point of cyst adhesion during postgastrular embryogenesis had no effect on this direction of emergence, which was 76% upward, 23% sideways, and 1% downward (P = 0.168), suggesting a gravity effect. In cysts incubated and hatched without a constant orientation to gravity prenauplii emerged in random directions. The embryos of stationary cysts, including decapsulated cysts, were motionless during postgastrular development until final emergence (late El stage). Therefore, gravity directs orientation of the embryo during development in stationary cysts and dictates a head-up orientation of the prenauplius prior to emergence.

10.1163/193724094X00687
/content/journals/10.1163/193724094x00687
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/content/journals/10.1163/193724094x00687
2017-08-21

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