. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 88 W. H. LAXG AND A. M. YOUNG The size of stage IV zoeae molting to megalopa (IVb) is greater than that for stage IV zoeae (IVa) molting to stage V. Size alone is not an adequate or reliable criterion for staging larvae of C. vittatus. Pigmentation of larvae was not studied in detail since the bulk of the material was preserved for later examination and alcohol rapidly bleaches chromatophores in this species. Based on brief observations of freshly sacrificed zoeae, a general pattern is evident. Chromatophores are red or oran
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 88 W. H. LAXG AND A. M. YOUNG The size of stage IV zoeae molting to megalopa (IVb) is greater than that for stage IV zoeae (IVa) molting to stage V. Size alone is not an adequate or reliable criterion for staging larvae of C. vittatus. Pigmentation of larvae was not studied in detail since the bulk of the material was preserved for later examination and alcohol rapidly bleaches chromatophores in this species. Based on brief observations of freshly sacrificed zoeae, a general pattern is evident. Chromatophores are red or orange-red and present in all stages. Small chromatophores occur ventrally along the rostrum and at the bases of the antenna and antennule. Variable patterns of small chromatophores and a diffuse faint reddish color are found in the mouth parts. At least three distinct chromatophores are found on the ventrolateral carapace surface. The abdomen has a large dorsal chromatophore in each segment and some fine color spots on the ventral surface. A more critical study of pigmentation in C. littatus may pro- vide a useful characteristic for the identification of fresh material. Descriptions and drawings of each stage follow. The present study has stressed setal numbers; when setal types are mentioned, terminology is based on. I' K'i'RK 1. L'li!>tiiuiriiis vittatus: lateral view of zoeal stages I-V. Stage IV zoeae may molt to stage V (IVa) or directly to megalopa (IVb).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original 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. Woods Hole, Mass. : Marine Biological Laboratory
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