Ischnochiton feliduensis E.A. Smith, 1903

Dell’Angelo, Bruno, Gori, Sandro, Baschieri, Leonardo & Bonfitto, Antonio, 2010, Chitons (Mollusca, Polyplacophora) from the Maldive islands, Zootaxa 2673 (1), pp. 1-38 : 7

Ischnochiton feliduensis E.A. Smith, 1903

( Figures 3K–M , 12C )

Ischnochiton feliduensis E.A. Smith 1903: 619 , pl. 36, figs 11–14; Nierstrasz 1905: 30; 1906: 151, 168.

Ischnochiton (I.) feliduensis ; Kaas & Van Belle 1990: 127, fig. 54.

Type: Holotype NHM 1903.9.17.25

Type locality: Maldive Archipelago , Felidu Atoll .

Material examined: Holotype, a dry specimen without the soft parts, 6 x 4 mm.

Remarks: This species is only known from the holotype, and has been redescribed by Kaas & Van Belle (1990). We present an illustration of the preserved holotype ( Fig. 12C ) and of a detached plate ( Figs 3K–M ), where the characteristic sculpture of the rough tegmentum with granules arranged quincuncially on lateral areas, and in longitudinal riblets on central area is clearly visible.

Distribution: Ischnochiton feliduensis is known only from the Maldive Islands.

Figures

FIGURE 3A–J, Ischnochiton sp., Maldive, living specimen, MLD03A. A, complete specimen, lateral view. B, detail of valves vii viii, lateral view. C, close-up of head valve. D, detail of the tegmentum covered by very small apical caps patterned with a semi-spherical layout. E–F, half detached intermediate valve, ventral views. G, ventral (left) and dorsal (right) girdle elements in situ. H, detail of perinotum elements in situ. I, J, dorsal and lateral views (respectively) of the apical caps patterned with a semi-spherical layout. K–M, Ischnochiton feliduensis E.A. Smith, 1903, Maldive, Felidhoo Atoll, Holotype, BMNH 1903.9.17.25, an intermediate valve detached (not coated). K, dorsal view. L, close-up of K. M, granules of the central area. Scale bars 1 mm: A; 500 µm: C, K; 100 µm: B, E, F, L; 50 µm: D, G, I, M; 10 µm: H, J.

FIGURE 12A, Parachiton hylkiae mauricejayi Schwabe, 2002, living specimen, Maldive, LB03B, length 12.8 mm. B, Ischnochiton albinus Thiele, 1911, living specimen, Maldive, M13, length 5.2 mm. C, Ischnochiton feliduensis E.A. Smith, 1903, Maldive, Felidhoo Atoll, Holotype, NHM 1903.9.17.25, length 6 mm. D, Tegulaplax hululensis (E.A. Smith, 1903), living specimen, Maldive, M28, length 10.5 mm. E–F, Callochiton sp., S. Nilandu Atoll, Maldive, NHM 1903.4.11.71 (living specimen collected by J.S. Gardiner), length 6.6 mm. G, Lucilina sp., living specimen, Maldive, M07, length 4 mm. H, Lucilina indica (Leloup, 1981), holotype (MNHN), Madagascar, Tuléar, length 8 mm. I, Acanthopleura miles (Carpenter in Pilsbry, 1893), living specimen, Japan, Okinawa, Sesoko Island, length 29.2 mm. J, Schizochiton incisus (Sowerby, 1841), living specimen, Indonesia: inside lagoon of Woka Island, off South Halmahera, 1°2.02’S, 128°13.97’E (ZSM Mol 20052075), length 40 mm. K, Acanthochitona penicillata (Deshayes, 1863), living specimen, Maldive, MLD04A, length 6.5 mm. L, Craspedochiton cf. laqueatus (Sowerby, 1842), living specimen, Maldive, M59, length 13.5 mm. M–Q, Craspedochiton laqueatus (Sowerby, 1842), NHM type material, Philippines, Mindoro, Calapan. M, lectotype (NHM 1988071/1), length 17.4 mm. N, paralectotype (NHM 1988071/2), length 17.5 mm. O–Q, paralectotypes (NHM 1988071/3-5), length respectively 16, 13.2 and 11.3 mm. R–S, Cryptoplax burrowi (E.A. Smith, 1884), living specimen, Maldive, M07, length ca. 11.7 mm. T, Cryptoplax burrowi (E.A. Smith, 1884), living specimen, Indonesia, ZSM Mol 20033081, length 25.4 mm. U–X, Cryptoplax burrowi (E.A. Smith, 1884), NHM 1992 053, syntypes, H. Cuming colln., Port Adelaide, S. Australia, length respectively 56.4, 38.5, 47 and 45.1 mm.