File:The Biological bulletin (19757530633).jpg

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Title: The Biological bulletin
Identifier: biologicalbullet178mari (find matches)
Year: [1] (s)
Authors: Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983
Subjects: Biology; Zoology; Biology; Marine Biology
Publisher: Woods Hole, Mass. : Marine Biological Laboratory
Contributing Library: MBLWHOI Library
Digitizing Sponsor: MBLWHOI Library

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168 D. L. LOVETT AND D. L. FELDER he
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Figure 5. Epilhelia of midgut diverticula in Pcnai'iis M-titcm*. postlarval stage PL35. A, anterior midgut diverticulum ventral to lumen (see Fig. 5c); these cells attach to hypodermis of dorsal pyloric valve of foregut: note "normal" cell (asterisk) surrounded by electron-dense cells. B, mosaic of cells where epithe- lium of anterior diverticulum tapers into midgut trunk. C. posterior diverticulum dorsal to lumen, (hi. basal lamina; g.Golgi bodies;gc,glycocalyx; he, hemocoel; lu, lumen; m, mitochondrion; me, cell undergo- ing mitosis: mv. microvilli; n. nucleus; rer, rough endoplasmic reticulum; sv, secretory vesicle; tj, tight junction; arrows indicate undulatory lateral membranes). Scale bar indicates 4 ^m for A and C and 5.8 urn for B. 1986; Caceci ct ai, 1988). and in other decapod crusta- ceans (Gibson and Barker, 1979). In P. setiferus. substantial morphological change oc- curs when the lateral midgut caeca of larvae differentiate into the hepatopancreas during early postlarval develop- ment (see Lovett and Felder, 1989). However, except for a decrease in the number and size of lipid droplets within cells during the mysis stages of development, the epithe- lial cells of the larval lateral caeca and of the mature he- patopancreas are identical in ultrastructure. The amy- lase, protease, and alkaline phosphatase activities that are evident in the lateral caeca during early development

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