Callochiton clausadeae Kaas & Van Belle, 1985

Dell’Angelo, Bruno, Gori, Sandro, Baschieri, Leonardo & Bonfitto, Antonio, 2010, Chitons (Mollusca, Polyplacophora) from the Maldive islands, Zootaxa 2673 (1), pp. 1-38 : 9-11

Callochiton clausadeae Kaas & Van Belle, 1985

( Figures 4A–C )

Callochiton clausadei Kaas & Van Belle 1985: 42 , fig. 17 (incorrect denomination, emended by Kaas 1986). Callochiton clausadeae ; Dell’Angelo et al. 2004: 51, pl. 3, figs 1–3 (bibliography and synonymy).

Type: MNHN (holotype + seven paratypes) , RMNH K 4993 /1 (paratype) .

Type locality: Madagascar, Tuléar , in caves, outer slope, 4–34 m.

Material examined: M13: 30 valves (4 head, 20 intermediate and 6 tail); M19: 2 intermediate valves; M20: 1 intermediate valve; M26: 7 valves (1 head, 4 intermediate and 2 tail); M65: 6 valves (3 intermediate and 3 tail); MLD01A: 6 valves (1 head, 4 intermediate and 1 tail); MLD02A: 12 valves (2 head, 8 intermediate and 2 tail); MLD03A: 4 valves (3 intermediate and 1 tail); MLD04B: 1 intermediate valve; MLD05A: 2 intermediate valves; MLD05B: 3 intermediate valves; LB04: 1 intermediate valve; LB05: 18 valves (2 head, 11 intermediate and 5 tail).

Remarks: A detailed description of this species is given by Kaas & Van Belle (1985). Collected valves agree with those of C. clausadeae , although their preservation is not very good. The only appreciable difference found relates to its slit formula, 12–16/1/12–15 vs. 18/1/12 reported by Kaas & Van Belle (1985). Also the pits in pleural areas are variable in number, up to 7–8 vs. 4–6 reported by Kaas & Van Belle (1985); some are more elongated and the outer ones can reach the anterior margin.

This is the first report of this species for the Maldive Islands.

Distribution: Callochiton clausadeae is reported from Madagascar, Mauritius, Réunion, and the Maldive Islands.

Figures

FIGURE 4A–C, Callochiton clausadeae Kaas & Van Belle, 1985, tail valve, Maldive, M13. A–B, dorsal and lateral views, respectively. C, detail of the sculpture. D–F, Callochiton sp., S. Nilandu Atoll, Maldive, NHM 1903.4.11.71 (living specimen collected by J.S. Gardiner, not coated). D, detail of the sculpture of an intermediate valve. E, dorsal view of the complete specimen. F, girdle dorsal spicules in situ. G–I, Rhyssoplax maldivensis (E.A. Smith, 1903), Maldive, MLD02A. G, intermediate valve, dorsal view. H–I, tail valve, dorsal and lateral views, respectively. J–O, Tegulaplax hululensis (E.A. Smith, 1903), Maldive, M13. J–L, head valve. J–K, dorsal and lateral views. L, detail of the sculpture. M–O, tail valve. M–N, dorsal and lateral views, respectively. O, detail of the sculpture. Scale bars 1 mm: E, G, J, K, M, N; 500 µm: A, B, D, H, I; 100 µm: C, F, L; 50 µm: O.