File:American malacological bulletin (1988) (18156311185).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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118 AMER. MALAC. BULL. 6(1) (1988)
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Figs. 2-7. Ischnochiton yerburyi Smith (specimens from Fuwairat, Qatar, Apr 1985, A, Woodward leg. in coll. Smythe, RMNH K5105). Fig. 2. Valve IV, dorsal view, 3.7 mm wide. Fig. 3. Valve VIII, dorsal view, 3.7 mm wide. Fig. 4. Camera lucida sketch of valve IV, rostral view, 5.5 mm wide. Fig. 5. Lateral view of valve VIII, 2.4 mm wide. Fig. 6. Dorsal girdle scale. Fig. 7. Central, first lateral, major lateral and spatulate uncinal radula teeth. greyish green, with roughly symmetrical blotches of dirty white on central part of valves. Many specimens with 2-3 dark spots at posterior margin of valves, some specimens uniformly roseate, more exceptionally, white or brownish. Head valve (Fig. 8) semicircular, front slope straight, posterior margin widely V-shaped, weakly notched medially. Intermediate valves (Figs. 9, 10, 13) broadly rectangular, front and hind margins nearly straight, parallel-sided, apices hardly or not indicated, side margins rounded, lateral areas little raised but neatly marked. Tail valve (Figs. 11, 12) somewhat less than semicircular, mucro not prominent, slightly anterior, posterior slope concave. Tegmentum granulose, sculpture often obsolete in younger specimens, variable in older ones. In most commonly occurring form, head valve of adult specimen sculptured with 36-40 radiating, somewhat irregular, granulose riblets, becom- ing obsolete toward apex, growth lines hardly or not indicated, lateral areas of intermediate valves with 4-5 similar radiating riblets, some bifurcating near outer margin, central areas, and antemucronal area of tail valve, with weak, fine, longitudinal riblets, 10-15 per side, becoming obsolete toward the finely quincuncially granulose jugal area, postmucronal area of tail valve sculptured like head valve. Articulamentum whitish to light roseate, tegmental color visible, apophyses thin, sharp, moderately wide, evenly arched, jugal sinus straight, ca. 1/5 width of valve, insertion plates short, slit formula 8-11/1/ 9-10, slit rays finely indicated, teeth sharp, smooth, eaves solid. Girdle moderately wide with alternating bands of yellowish and greyish green, dorsally covered with strongly bent, imbricating scales, ca. 150 x 120 ^m; top rounded, ornamented with ca. 10 strong ribs wider than interstices (Fig. 14) . Margin with fringe of short, white, torpedo-shaped spicules. Ventral side of girdle paved with radiating rows of elongate rectangular, smooth scales, 67 x 20 fim. Radula (Fig. 15) with narrow central tooth bearing a roundish, upwardly curled blade; first laterals equally narrow, ending in inwardly curved, hook-shaped blade; major laterals with strong, sharply pointed main cusp and short minor denticle on outside. Gills holobranchial, abanal, 18 ctenidia per side in 7.4 mm specimen. Genus Lepidozona Pilsbry, 1892 Type Species: Chiton mertensii von Middendorff, 1847 (by original designation). Subgenus Lepidozona s.s. Lepidozona (L.) luzonica (Sowerby, 1842) Figs. 16-23 Chiton luzonicus Sowerby, 1842: 104. Reeve, 1847: pi. 25: sp. and fig. 167. Van Belle, 1982: 473.

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