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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 of Crustacean Biology – Brill
Published: Jan 1, 1993
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