File:American malacological bulletin (1988) (18157363321).jpg

Title: American malacological bulletin
Identifier: americanmal6719881990amer (find matches)
Year: 1983 (1980s)
Authors: American Malacological Union
Subjects: Mollusks; Mollusks
Publisher: (Hattiesburg, Miss. ?) : (American Malacological Union)
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Biodiversity Heritage Library

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LYONS: CARIBBEAN ACANTHOCHITONIDAE 81
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Figs. 1-6. Acanthochitona hemphilli (Pilsbry, 1893). Fig. 1. Whole specimen, 42.6 mm; Harbour Id., Eleuthera, Bahamas; FSBC I 32041. Fig. 2. Valve i ex 15.2 mm specimen; Dry Tortugas, Florida; FSBC I 32045. Fig. 3. Valve iv, same specimen. Fig. 4. Valve viii, same specimen. Fig. 5. Tegmental pustules, valve v, 16.7 mm specimen; same lot (field width = 330 ^m). Fig. 6. Spicules of dorsal girdle mat, specimen from McLeanstown, Grand Bahama; FSBC I 32047 (field width = 500 jim). DESCRIPTION: Largest specimen 51.3 mm long, 28.0 mm wide including girdle; valves occupying about 30% of total specimen width (Fig. 1). Exposed parts of valves dark red with white maculations, small relative to total specimen size; unex- posed valve parts greenish white. Girdle broad, fleshy, ap- pearing smooth, dark brown, with few brown or reddish brown spicules in dorsal tufts; color of girdle and tufts sometimes faded in preserved material. Valve i semilunate (Fig. 2), wider than long, beaked, sinuous posteriorly, with anterior insertion plate bearing 5 slits; tegmentum occupying about 65% total valve length. Valves ii-vii strongly beaked (Fig. 3); tegmentum spade-shaped, about as long as wide, strongly constricted anteriorly, with broadly sinuous anterolateral margins; sutural laminae broad, expand- ed anteriorly, with subparallel lateral margins rendering overall valve shape nearly quadrate except for broad, shallow anterior sinus; single small narrow slits near midpoints of margins. Valve viii subtriangular (Fig. 4), rounded posteriorly, with elevated mucro posterior of center; tegmentum drop-shaped, longer than wide, constricted anteriorly; sutural laminae large, flared anterolateral^, with straight to sinuous anterior margins, separated by wide V-shaped sinus; 2 slits in posterior inser- tion plate small, narrow, V-shaped. Jugum smooth, narrow, with parallel sides well- separated from lateral tegmental surface. Tegmentum of all valves covered with small (35-50 /xm), round to ovate, cupped pustules with edges incised at apex to render overall ap- pearance reniform (kidney-shaped) (Fig. 5), with single cen- tral macresthete, 2-3 micresthetes. Girdle upper surface appearing smooth, actually covered with dense mat of very small (50 ^m) slender, sharp, brown spicules (Fig. 6); 18 anterior and sutural dorsal tufts with about 50 thick, reddish-brown to white, flat-sided spicules, longest 1.5-2.0 mm; slender, needle-like, sharp spicules in- terspersed among larger spicules of tufts; margin with dense fringe of straight, slender, brown and white spicules 1.0-1.5 mm long; underside covered with small (50 ^m) slender, sharp, white spicules directed toward periphery. DISCUSSION: Acanthochites hemphilli Pilsbry, 1893, was de- scribed from a specimen collected at Key West, Florida, and the name generally has been applied to the large (>50 mm) fleshy species that occurs in south Florida, the Bahama Islands, and the northern Caribbean Sea. A. rhodeus

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