. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 26 G. HENDLER. Figure 3. Amphutra filiformis: growth stages of jaw and oral papillae. Stages numbered according to Table I. Abbreviations as in Figure 2. (A| Stage 2; mm dd, terminal arm plate. (B| Stage 4; mm dd, 25 AS. (C) Stages 7-8; mm dd. (D) Adult; mm dd, > 125 AS. dental papillae in A. filiformis and A. stimpsonii. Late larval stages of A. filiformis have not yet been studied to determine whether the buccal scale appears before the adoral shield spine, as it does in A. stimpsonii. In both Amphiu
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 26 G. HENDLER. Figure 3. Amphutra filiformis: growth stages of jaw and oral papillae. Stages numbered according to Table I. Abbreviations as in Figure 2. (A| Stage 2; mm dd, terminal arm plate. (B| Stage 4; mm dd, 25 AS. (C) Stages 7-8; mm dd. (D) Adult; mm dd, > 125 AS. dental papillae in A. filiformis and A. stimpsonii. Late larval stages of A. filiformis have not yet been studied to determine whether the buccal scale appears before the adoral shield spine, as it does in A. stimpsonii. In both Amphiura species, the rudiments of infradental papillae originate on the dental plate and transfer to the tips of the oral plates; the buccal scales move from the superfi- cial distal edge of the adoral shield to the oral plate. The intrageneric similarity in oral papilla ontogenesis of these two Amphiura species is paralleled by Amphiophis maci- lentus and A. abditus, congeners with nearly identical patterns of oral papilla ontogeny (Hendler, 1978; unpub. obs.; see Table I, this report). Similarities in the sequence of formation, origin, and morphological development of structures in related species provide a basis for determi- nation of homologies of skeletal elements using standard morphological criteria of homology (Wiley, 1981). Homologies ofamphiurid oral papillae Two aspects of the ontogenesis of A. filiformis, A. stimpsonii, and O. filograneus indicate that amphiurid. 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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