File:American malacological bulletin (1988) (18156332765).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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126 AMER. MALAC. BULL. 6(1) (1988)
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Figs. 45-50. Onithochiton erythraeus Thiele. Fig. 45. Valves VI-VIII in situ, dorsal view, 10.3 mm wide. Fig. 46. Central and first lateral radula teeth. Fig. 47. Major lateral and spatulate uncinal teeth. Fig. 48. Dorsal girdle scales from mid-girdle. Fig. 49. Same, near outer margin. Fig. 50. Marginal spicules. elusions of Leloup (1960). Pending a thorough study of the type material and good specimens from the different localities, we prefer to treat the matter conservatively and consider O. erythraeus a valid species, especially after we were able to compare the Oman specimens with several lots of O. literatus from Isipingo, Natal, and Inhaca Id., Lourenco Marques, Mozambique, which proved to be quite differently sculptured. Suborder Acanthochitonina Family Acanthochitonidae Pilsbry, 1893 Subfamily Acanthochitoninae Genus Acanthochitona Gray, 1821 Type Species: Chiton fascicularis Linnaeus, 1767 (by monotypy). Acanthochitona woodwardi Kaas and Van Belle, sp. nov. Figs. 51-60 TYPE MATERIAL: HOLOTYPE: 6.7 x 4.0 mm, Qatar, Dasa, 15 Nov 1978, K. Smythe leg., BM(NH) 1987032. PARATYPES: QATAR: 17 spec, max. 9.0 x 4.7 mm, collected with holotype, 13/KS, 2/RMNH K5095 (one disarticulated, figured here), 2/VB 2968b. —2 spec, (curled, one on matchstick) Ras Abruk, 3 Nov 1978, A. Partridge leg., KS. —1 spec, (disarticulated), Ras Abruk, under broken slabs of fasht, intertidal, May 1982, A. Woodward leg., KS. —3 spec, Fuwairat, on rocks and dead coral, 0-1 m, June 1985, A. Woodward leg., 2/KS 1/RMNH K5096. —2 spec, (one juvenile), Al Wakrah, K. Smythe leg., KS. KUWAIT: 2 spec, Al Bide, on rocks in intertidal zone, 29 Jan 1975, B. Glayzer leg., 1/BG 1425 (as Chiton sp.), 1/KS (disarticulated, on slide). —2 spec, 5.5 x 3.0 mm (damaged) and 5.0 x 2.5 mm (disar- ticulated), Bide Circle, under stones in tidepool, MTL, F. Hinkle leg., 12 June 1978, former, FH, latter, VB 2968a. —1 spec, 8.5 x 4.0 mm, id., 1 Aug 1981, FH. DISTRIBUTION: Kuwait and Qatar; intertidal. DIAGNOSIS: Animal small, holotype 6.7 x 4 mm, length of largest specimen 9 mm, width about half length, elongate oval, rather flat (dorsal elevation 0.20-0.24), back subcarinate, side slopes straight to slightly convex, head and intermediate valves decidedly beaked. Tegmentum mostly whitish to light beige, speckled or flecked with dark greyish green, some specimens with light brownish or reddish brown, more or less triangular blotch on jugum of valve II, another specimen red- dish, shading into roseate to whitish on apical areas, holotype blackish brown, with jugum and girdle whitish. Tegmental sculpture of flat, roundish to oval, neatly separated granules, jugal areas not raised, weakly ribbed longitudinally. Girdle finely spiculose, little encroaching at sutures. Major lateral radula tooth tricuspid. DESCRIPTION: Head valve (Fig. 51) semicircular, front slope somewhat convex, anterior margin vaguely waved, posterior margin beaked, tegmentum sculptured with neatly separated, flat, roundish to oval, quincuncially arranged granules, larger toward outer margin, smaller, becoming obsolete toward apex, no growth lines. Intermediate valves (Figs. 52-53) twice as wide as long, front margin straight to slightly convex at both sides of concave jugal part, hind margin concave at both sides of strongly protruding apex, jugal area narrowly wedge- shaped, not raised, sculptured with ca. 5 weak, flat, longitudinal ribs separated by very fine grooves, lateral areas not marked but slightly raised with regard to pleural areas, sculpture of latero-pleural areas similar to that of head valve but granules larger, more widely spaced, less regularly ar- ranged. Tail valve (Figs. 54, 55) slightly oval transversely, mucro prominent, pointed, somewhat behind centre, posterior slope strongly concave, tegmentum sculptured like latero- pleural areas of intermediate valves. Articulamentum whitish, tegmental color slightly visi- ble through, intermediate valves with transverse callus in cen-

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