. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. LARVAL HYDROMECHANICS 435. FIGURE 1. Echinoplutei and their spicules. (A) Lateral view of a two week old larva held in place by a suction pipette. Note simple spicules. (Transmitted light micrograph) Scale: 100 ^m. (B) Dorsolateral view of a 3 week old larva of D. excentricus with fenestrated spicules showing through a torn epidermis. Scale: 50 (C) 'Half-skeleton' of S. franciscanus showing the simple arm spicules, same stage as A. (D, E) Early and later stages of the fenestrated 'half-skeleton' of Z>
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. LARVAL HYDROMECHANICS 435. FIGURE 1. Echinoplutei and their spicules. (A) Lateral view of a two week old larva held in place by a suction pipette. Note simple spicules. (Transmitted light micrograph) Scale: 100 ^m. (B) Dorsolateral view of a 3 week old larva of D. excentricus with fenestrated spicules showing through a torn epidermis. Scale: 50 (C) 'Half-skeleton' of S. franciscanus showing the simple arm spicules, same stage as A. (D, E) Early and later stages of the fenestrated 'half-skeleton' of Z>. excentricus. E. Arrows show where the skeleton is modified to allow articulation of the fenestrated postoral rod. C, D, E scale: 100 ^m. (B-E are SEM micrographs.) Key: AL = anterolateral arm and spicule, DA = dorsal arch spicule, PD = posterodorsal arm and spicule, PO = postoral arm and spicule, PR = preoral hood region, LG = larval gut, A = articulation of spicules. of the preoral dilator musculature. This latter type of arm movement is associated with handling and rejecting food particles as discussed by Strathmann (1971). In contrast to the echinoplutei, ophioplutei have only two spicules and these are not movable. Each of these spicules branches into four to six simple rods in fully developed larvae. MATERIALS AND METHODS The larvae used in this study were raised in culture or obtained from the plankton and include the species Clypeaster subdepressus (Gray), Dendraster excentricus (Eschscholtz), Diadema mexicanum A. Agassiz, Echinometra vanbrunti A. Agassiz,. 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-; Redfi
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
