File:American malacological bulletin (1988) (17535759243).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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KAAS AND VAN BELLE: CHITONS OF ARABIAN GULF 125
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Figs. 41-44. Tonicia (Lucilina) sueziensis (Reeve) (specimen from Fuwairat, Qatar, June 1985, A. Woodward leg. in coll. Smythe, RMNH K5098). Fig. 41. Right half of valves IV and V in situ, 4.25 mm wide. Fig. 42. Dorsal girdle spicules. Fig. 43. Ventral girdle scales. Fig. 44. Central, first and major lateral radula teeth. TYPE LOCALITY: Egypt, Suez. DESCRIPTION: Tonicia (Lucilina) sueziensis was adequately described by several authors, particularly Leloup (1960), who produced detailed figures of the girdle elements, and Ferreira (1983), who gave good figures of the lectotype and an accurate description of the radula. Girdle covered dorsally with extremely minute, bullet- shaped spicules, 36 x 20 nm, top with 4-5 short riblets on visi- ble half; ventral scales (Fig. 43) arranged in lateral rows, rec- tangular, base slightly concave, top rounded, 25 x 19 /tm (Figs. 41-43). Central tooth of radula (Fig. 44) small, very narrow, 68 x 7 ^m, with sharply pointed blade; first laterals broad, base bluntly pointed, pinched in middle, gradually widening distaad, with outwardly directed extension; major laterals with tetracuspid head, denticles short, bluntly rounded, shaft with trunk-like appendix just under and beneath head, directed inward. DISCUSSION: Ferreira (1983: 274) wrongly synonymized Tonicia (Lucilina) carnosa Kaas, 1979, from Mozambique, the Comoro Archipelago, and Madagascar, with the present species. T. (L.) carnosa differs considerably in color and in having much weaker sculpture with far fewer longitudinal grooves on central areas of intermediate valves. Genus Onithochiton Gray, 1847 Type Species: Chiton undulatus Quoy and Gaimard, 1835. non Olfers, 1818; Wood, 1828 (= Onithochiton neglectus de Rochebrune, 1881 (by subsequent designation, Gray, 1847). Onithochiton erythraeus Thiele, 1910 Figs. 45-50 Onithochiton erythraeus Thiele, 1910: 98, pi. 10, figs. 53-55. Leloup, 1941: 13; 1960: 42, 45, 47. Glynn, 1970: 17. Kaas, 1979: 872. Ferreira, 1983: 276-277. Onithochiton lyelli forma erythraeus, Pearse, 1978: 93, 95, fig. 3. HOLOTYPE: ZMHU. MATERIAL EXAMINED: OMAN: 1 spec, 16 mm, Arabian Sea, Masirah Id., 12 Jan 1984, D. Bosch leg., KS. —1 spec, length 21 mm, (slightly curled), id., Rassier, 9 Feb 1982, K. Smythe leg., KS. —2 spec, max. width 12.5 mm (both curled), between Rassier and Haql, K. Smythe leg., 1/KS 1/RMNH K5098. —1 spec, length 13 mm (curled), Haql, K. Smythe leg., KS. TYPE LOCALITY: Erythraea, El Tor. DISTRIBUTION: Gulf of Suez, Red Sea, and Arabian Sea coast of Oman; intertidal. DESCRIPTION: Girdle densely clothed dorsally with tiny, bluntly pointed scales, ca. 23 x 10 /urn, top with 5-7 riblets (Figs. 45-49). Marginal spicules (Fig. 50) smooth, cylindrical, bluntly pointed, ca. 90 x 22 ^m; ventral scales very small, shorter than wide, ca. 20 x 15 /zm. Central tooth of radula (Figs. 46, 47) about twice as long as wide, widest in anterior part, with extremely narrow, abrupt- ly pointed blade and median, raised riblet in anterior half, base equally pointed; first laterals twice length of central teeth, trun- cate at base, with central, short, sharp thorn, gradually nar- rowing anteriorly, ending in narrow, rounded blade; major laterals with tetracuspid head, denticles short, blunt, shaft with short, funnel-shaped appendix just under and anteriorly of head; spatulate uncinal teeth with elongate triangular blade. DISCUSSION: Though it has not been studied thoroughly before, Onithochiton erythraeus has been compared with several related Onithochiton species. Leloup (1941) conclud- ed it was synonymous with O. maillardi (Deshayes, 1863) from Mauritius. Later, he (Leloup, 1960) considered both of these species, as well as O. quercinus (Gould, 1846) from New South Wales, O. literatus (Krauss, 1848) from South Africa, O. wahlbergi (Krauss, 1848) from the Cape of Good Hope, O. rugulosus Angas, 1867 from New South Wales, and O. schol- vieni Thiele, 1910 from New South Wales, to be junior synonyms of O. lyelli (Sowerby, 1832). Ferreira (1983) synonymized O. wahlbergi, O. maillardi and O. erythraeus with O. literatus. Kaas (1979) expressed some doubts as to the con-

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