Title: The Biological bulletin
Identifier: biologicalbullet159mari (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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CRAYFISH LEG REGENERATION: CONTROL 703 Mosaic legs The majority (15/27) of the mosaic legs at the \Y site had the anterior half W-like and the posterior half C-like (Fig. 2). The division between W-like and C-like halves was especially clear on the ventral surface of the meropodite, where an anterior row of W-like setae paralleled a posterior row of C-like tubercles of variable prominence. Occasionally (2/27 animals), one or two tubercles appeared in the anterior row. A few mosaic walking legs appeared YV-like except that tubercles replaced setae in the posterior row. In mosaic W with differing anterior and posterior portions (antero-posterior), the posterior surfaces of the meropodite and carpopodite, which are smooth in nor- mal W, often had low tubercles. The carpopodite was abnormally broad but had W-like anterior rows of setae. Tubercles occur on a normal C, and setae on a normal W, on the propodite and dactylopodite. The propodites of antero-posterior mosaic W had setae on the anterior face and tubercles on the posterior face. The tubercles differed in promi-
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FIGURE 2. Antero-posterior mosaic walking legs. All four legs shown are from right side of animal. Ai, A», and C are backlighted to show setae, so tubercles appear as dark spots in these pictures. Ai, A2: Typical antero-posterior mosaic W, ventral view. Rows of W-like setae occur on the anterior side of the meropodite and propodite (left side of picture), and rows of C-like tubercles on the posterior side. Curvature of the index toward the anterior side is greater than in a walking leg. B, C: Variant mosaic W. B: Anterior view of proximal segments, ventral view of propodite. The leg resembles those shown in Ai and A« except for a few tubercles on the anterior side of the meropodite and carpopodite (arrows). C: posterior view. Postero-dorsal aspect is C-like, ventral and anterior aspects W-like.

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