. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. LARVAL STAGES OF L DORSALIS 287. FIGURE 1. Lithotrya dorsalis. Dorsal view of shield outlines of naupliar stages I-VI. The nauplii^ The naupliar stages as seen from above are illustrated in Figure 1. First stage nauplii (Fig. 1, I) are characterized by frontolateral horns directed posteriorly with the posterior region of the cephalic shield tapering distinctly into a rudimentary tho- racic spine dorsal to a small, forked thoraco-abdominal process. A median naupliar eye is evident and remains throughout naupliar development.
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. LARVAL STAGES OF L DORSALIS 287. FIGURE 1. Lithotrya dorsalis. Dorsal view of shield outlines of naupliar stages I-VI. The nauplii^ The naupliar stages as seen from above are illustrated in Figure 1. First stage nauplii (Fig. 1, I) are characterized by frontolateral horns directed posteriorly with the posterior region of the cephalic shield tapering distinctly into a rudimentary tho- racic spine dorsal to a small, forked thoraco-abdominal process. A median naupliar eye is evident and remains throughout naupliar development. A unilobed labrum with one median tooth is present. Stage I nauplii have the full complement of naupliar appendages, the uniramous antennules, biramous antennae, and mandibles, provided with simple setae. It is a nonfeeding stage and molts to stage II within one or two hours post hatching. The thoraco-abdominal process and dorsal thoracic spine become elongated and spinulated at stage II (Fig. 1, II) and remain this way throughout naupliar develop- ment. The thoraco-abdominal process is distinctly and deeply forked and contains one pair of series 1 spines (Fig, 2, II). A row of fine, slightly arched hairs appear on each side of the proximal portion of the labrum. An additional tooth appears at either 1 Descriptive terminology after Lang (1979) with the exception of the term "thoraco-abdominal" pro- cess suggested by W. A. 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
Size: 1689px × 1479px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
