. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ANTARCTIC ECHINOID REPRODUCTION 131. 100 (jm FIGURE 1. Early eight-arm pluteus of Sterechinus neumayeri shortly after the formation of the pre- oral pair of arms (indicated by arrow). Scale bar = 100 DISCUSSION Embryonic and larval development Compared to other species that have been studied, the developmental stages of Sterechinus neumayeri are most similar in shape and size to those of the temperate echinoid, Echinus esculentus (MacBride, 1903). However, the formation of spines on the external surface of the larvae, separa
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ANTARCTIC ECHINOID REPRODUCTION 131. 100 (jm FIGURE 1. Early eight-arm pluteus of Sterechinus neumayeri shortly after the formation of the pre- oral pair of arms (indicated by arrow). Scale bar = 100 DISCUSSION Embryonic and larval development Compared to other species that have been studied, the developmental stages of Sterechinus neumayeri are most similar in shape and size to those of the temperate echinoid, Echinus esculentus (MacBride, 1903). However, the formation of spines on the external surface of the larvae, separate from the juvenile rudiment, clearly distinguishes the larvae ofS. neumayeri from those of E. esculentus and other species studied within the family Echinidae (MacBride, 1903; Arrau, 1958; Cram, 1971). Morphologically similar spines reportedly develop on the echinoplutei of several other species of regular echinoids, including both euechinoid and cidaroid forms (Onoda, 1931, 1936; Fukushi, 1960; R. Emlet, pers. comm.). The time of development for the entire period from fertilization to metamorpho- sis of Sterechinus neumayeri is extremely long. Within the family Echinidae, the tern-. 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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