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CELL GROWTH AND CUTICLE EXPANSION IN EYESTALK-ABLATED GRASS SHRIMP, PALAEMONETES PUGIO HOLTHUIS

CELL GROWTH AND CUTICLE EXPANSION IN EYESTALK-ABLATED GRASS SHRIMP, PALAEMONETES PUGIO HOLTHUIS and Crustaceans grow by molting which in- volves periodic replacement of their exo- skeleton (Passano, 1960). This growth pro- cess involves increased number and size of the epidermal cells, as well as developmen- tal changes in the larval stages (Williamson, 1982). At each ecdysis the amount of growth, or molt increment, is a result of the amount of tissue growth during the molt cycle and the degree of stretch of the new exoskeleton due to uptake of water during molting. Re- cently, Freeman (I 990a) found that increase in the density of the posterior dorsal epi- dermal cells during the first day of the molt cycle in larval Palaemonetes pugio was pro- portional to the molt increment observed at the next ecdysis. Since there was no mi- tosis during this period, the increase in den- sity was attributed to enlargement of post- mitotic (cell cycle stage G,) cells. Later, during premolt, epidermis grows by mito- sis, as observed in premolt stages of adult Palaemon serratus (see Tchernigovtzeff, 1959), Orconectes virilis (see Travis, 1965), Gecarcinus lateralis (see Skinner, 1966), and Daphnia magna (see Halcrow, 1978), and intermolt and premolt phases of larval Pi- sidia longicornis (see Le Roux, 1978) http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Crustacean Biology Brill

CELL GROWTH AND CUTICLE EXPANSION IN EYESTALK-ABLATED GRASS SHRIMP, PALAEMONETES PUGIO HOLTHUIS

Journal of Crustacean Biology , Volume 13 (1): 125 – Jan 1, 1993

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Publisher
Brill
Copyright
Copyright 1993 by Koninklijke Brill NV, Leiden, The Netherlands
ISSN
0278-0372
eISSN
1937-240X
DOI
10.1163/193724093X00499
Publisher site
See Article on Publisher Site

Abstract

and Crustaceans grow by molting which in- volves periodic replacement of their exo- skeleton (Passano, 1960). This growth pro- cess involves increased number and size of the epidermal cells, as well as developmen- tal changes in the larval stages (Williamson, 1982). At each ecdysis the amount of growth, or molt increment, is a result of the amount of tissue growth during the molt cycle and the degree of stretch of the new exoskeleton due to uptake of water during molting. Re- cently, Freeman (I 990a) found that increase in the density of the posterior dorsal epi- dermal cells during the first day of the molt cycle in larval Palaemonetes pugio was pro- portional to the molt increment observed at the next ecdysis. Since there was no mi- tosis during this period, the increase in den- sity was attributed to enlargement of post- mitotic (cell cycle stage G,) cells. Later, during premolt, epidermis grows by mito- sis, as observed in premolt stages of adult Palaemon serratus (see Tchernigovtzeff, 1959), Orconectes virilis (see Travis, 1965), Gecarcinus lateralis (see Skinner, 1966), and Daphnia magna (see Halcrow, 1978), and intermolt and premolt phases of larval Pi- sidia longicornis (see Le Roux, 1978)

Journal

Journal of Crustacean BiologyBrill

Published: Jan 1, 1993

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