File:American malacological bulletin (1988) (18157458711).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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120 AMER. MALAC. BULL. 6(1) (1988)
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Figs. 16-23. Lepidozona luzonica (Sowerby) (Fig. 16, lectotype: Figs. 17-23, paralectotypes (BMNH 1979.175)). Fig. 16. Whole specimen, dorsal view, 5.8 mm wide. Fig. 17. Right half of valve III, dorsal view, 4.6 mm wide. Fig. 18. Camera lucida sketch of valve III, rostral view, 7.3 mm wide. Fig. 19. Valve III, dorsal view, 7.3 mm wide. Fig. 20. Valve II, dorsal view, 6.9 mm wide. Fig. 21. Dorsal girdle scales. Fig. 22. Central and first lateral radula teeth. Fig. 23. Heads of major lateral teeth. 0.36-0.39) carinated, side slopes straight, valves not beaked. Color of tegmentum yellowish to greenish with, on central areas, few longitudinal streaks of darker tone, or buff, sparsely spotted with bluish green. Head valve semicircular, front slope somewhat con- cave, hind margin widely V-shaped, deeply notched in mid- dle, tegmentum sculptured with low, radial, often bifurcating, granulose riblets, 40-50 in number along outer margin, becom- ing obsolete toward apex. Intermediate valves (Figs. 17-20) broadly rectangular, front and hind margins straight, parallel- sided, side margins rounded, apices inconspicuous, lateral areas little raised, 5-6 riblets, up to 7-9 by splitting, central areas with 12-16 longitudinal, granulose ridges per side, ridges close-set and little pronounced on jugal areas, gradually more widely spaced and elevated toward side margins, interspaces finely, densely, but irregularly, transversely grooved. Tail valve subsemicircular, almost as wide as head valve, mucro at anterior third of valve, not prominent, postmucronal area rather flat, sculptured like head valve, ca. 32 riblets along outer margin, antemucronal area sculptured like central areas. Articulamentum glossy white, apophyses very wide, short, rounded, connected across shallow sinus by short, slightly concave, laminated jugal plate, weakly notched at sides, slit formula 11-14/1/10-13, slits inequidistant, slit rays indicated, teeth short, weakly grooved on outside, eaves nar- row, solid. Girdle buff-colored, sometimes banded with bluish green, dorsally covered with obliquely implanted, slightly bent, more or less rectangular scales, with 12-16 obsolete ribs, up to 125 /*m long, 188 nm wide in mid-girdle, smaller toward the outer margin (Fig. 21). Central tooth of radula (Fig. 22) narrow at base, gradually widening to strong, rounded blade, first lateral tooth about as long as central one, slender, with somewhat distorted blade, major lateral (Fig. 23) with a tricuspid head, denticles sharply pointed, central one longer than others. DISCUSSION: The present specimens undoubtedly are con- specific with Lepidozona luzonica, differing only in a less pro- nounced sculpture; radula and girdle armature are exactly like specimens of L. luzonica from elsewhere. Specimens from the Arabian Gulf extend the known range of L luzonica con- siderably to the west and establish the presence of Lepidozona in the northwestern Indian Ocean. Subfamily Callistoplacinae Pilsbry, 1893 Genus Callistochiton Carpenter in MS; Dall, 1879 Type Species: Callistochiton palmulatus Carpenter in MS (by monotypy, Dall, 1879). Callistochiton adenensis (E. A. Smith, 1891) Figs. 24-27 Chiton (Callistochiton) adenensis E. A. Smith, 1891: 421, pi. 33: fig. 7. Callistochiton adenensis Pilsbry, 1893: 276, pi. 59: fig. 45. Nierstrasz, 1905: 41. Sykes, 1907: 31. Thiele, 1910: 84, pi. 8: figs. 49-51. Ashby, 1923: 233. Leloup, 1952: 30; 1953: 1, fig. 1. Kaas, 1979: 861. Ferreira, 1979: 463. Zeidler and Gowlett, 1986: 114. Lepidopleurus rochebruni Jousseaume, 1893: 102. Nier- strasz, 1905: 10; 1906: 145, 157. HOLOTYPE: BMNH. MATERIAL EXAMINED: OMAN: 2 spec, max. 24 x 12 mm, Al Bastan or Masirah Id., Mar 1984, D. Bosch leg., 1/KS, 1/RMNH K5101. —1 spec, 16 mm (curled), Arabian Sea, Masirah Id., I. 1984, D. Bosch leg., KS; —1 spec, id., between Haql and Rassier, K. Smythe leg., KS. —1 spec, 18 mm, Rassier, K. Smythe leg., KS. —2 spec, 18.5. 18 mm long, (disarticulated), Rassier, 9 Feb 1982, K. Smythe leg., 1/KS, 1/VB 2976a. TYPE LOCALITY: Aden. DISTRIBUTION: Gulf of Aden; Arabian coast of Oman; possibly Gulf of Oman. DESCRIPTION: Girdle densely covered with strongly im- bricating, wide, short, oval, curved scales, with more than twenty elevated riblets, narrow, latticed interstices, ca. 140 x 50 ^m; marginal scales small and narrow, bluntly conical, 25 x 50 /*m, with ca. 6 ribs; ventral side of girdle covered with transverse rows of rectangular scales, ca. 60 x 15 fim (Figs. 24-26).

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