File:American malacological bulletin (1988) (17535691213).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 95 valves, Punta Palmar Lighthouse, Yucatan, TUDG collection. —7 valves, Isla Cerritos, 5 km west of San Felipe, Yucatan, TUDG col- lection. —1 spec, 13.0 mm, Isla Mujeres, Quintana Roo, 0-1 m, 29 Sept 1985, FSBC I 32072. TYPE LOCALITY: Key West, Florida (by subsequent designa- tion, Watters, 1981). DISTRIBUTION: Bermuda, both coasts of Florida, Campeche to Quintana Roo, Mexico; Bahama Islands to Puerto Rico, Virgin Islands, and Saba Bank; intertidal to about 40 m. DESCRIPTION: Largest specimen 21.2 mm long, 12.0 mm wide including girdle; valves occupying 40-45% total specimen width (Fig. 66). Valves green, orange, often white variegated with green or brown. Girdle buff or tan, usually with green, blue-green or black bars, sometimes with orange spots; dorsal spicular tufts green, blue-green or white; spicules of marginal fringe white, usually in combination with blue or magenta. Valve i semilunate (Fig. 67), wider than long, broadly V-shaped or concave posteriorly, with anterior insertion plate bearing 5 slits; tegmentum occupying about 90% of valve length. Valves ii-vii beaked posteriorly (Figs. 68, 69); tegmen- tum ovate, about 1.6 times as wide as long, with convex anterolateral margins; sutural laminae with rounded to subacute anterior tips separated by broad sinus; single slits along lateral margins. Valve viii trigonal (Fig. 70), widest at anterolateral tips, rounded posteriorly; tegmentum ovate, slightly wider than long; mucro prominent, subcentral; sutural laminae flared anterolaterally, with straight or concave anterior margins; 2 narrow slits in posterior insertion plate. Jugum expanded anteriorly, with distinct longitudinal incisions usually over entire length, sometimes rubbed smooth anteriorly, lateral margins irregularly merging with pustules of tegmentum. Tegmental pustules shallowly cupped, ovate to drop-shaped (Fig. 71), about 120 /*m long, 70 /iim wide, with central macresthete, 3-6 micresthetes. Girdle upper surface covered densely with slender, vitreous, sharp-tipped spicules about 100-150 /*m long; 18
Text Appearing After Image:
Figs. 66-72. Acanthochitona pygmaea (Pilsbry, 1893). Fig. 66. Whole specimen, 12.2 mm; Grassy Key, Monroe County, Florida; FSBC I 32056. Fig. 67. Valve i ex 13.2 mm specimen; Tampa Bay, Florida; FSBC I 32052. Fig. 68. Valve iv, same specimen. Fig. 69. Valve v, same specimen. Fig. 70. Valve viii, same specimen. Fig. 71. Tegmental pustules, valve iv, same specimen (field width = 235 urn). Fig. 72. Paralectotype, 8.0 mm; Cedar Keys, Florida; ANSP 35782.

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