Chaetopleura caboverdensis ( Kaas & Strack, 1986 )

Dell’Angelo, Bruno, Schwabe, Enrico, Gori, Sandro, Sosso, Maurizio & Bonfitto, Antonio, 2014, Chitons (Mollusca, Polyplacophora) from São Tomé and Príncipe Islands, African Invertebrates 55 (2), pp. 171-200 : 181

Chaetopleura caboverdensis ( Kaas & Strack, 1986)

Figs 4A–L

Lepidochitona caboverdensis: Kaas & Strack 1986: 79 , figs 1–15; Kaas & Van Belle 1987: 31, fig. 14; Kaas 1991: 91; Slieker 2000: 28, fig. 17; Ardovini & Cossignani 2004: 18.

Holotype: MNHN, 5.8 × 3.2 mm, preserved dry. Paratypes: Many specimens in several institutions (see Kaas & Strack 1986). Type locality: Senegal, Dakar.

Chaetopleura caboverdensis: Rolán 2005: 27 , fig. 2; Sirenko 2006: fig. 1I.

Material examined: ST03: 21 valves (4 head, maximum width 2.5 mm, 16 intermediate, maximum width 3 mm, and 1 tail, width 1.5 mm) ( ER); ST11: 21 valves (4 head, maximum width 2.3 mm, 15 intermediate, maximum width 3 mm, and 2 tail, maximum width 2.2 mm) ( BD 112A ); PR05: 1 intermediate valve, width 2.3 mm ( BD 112B ); PR07: 2 intermediate valves, maximum width 2.2 mm ( BD 112C ); CAPE VERDE: Cape Verde Archipelago, São Vicente , Praia da Matiota : 1 specimen ( BD 2919 ) .

Distribution: Cape Verde Archipelago, Senegal, and São Tomé and Príncipe Islands.

Comparison and remarks: This species was originally placed in the genus Lepidochitona , mainly due to the morphology of the ventral girdle scales and to the characters of the articulamentum, but was later considered as belonging to Chaetopleura (see Rolán 2005; Sirenko 2006). The available material was only separate valves, well defined by the subcarinate and slightly beaked intermediate valves, and by the characteristic microsculpture: rounded and elevated granules with a central macroaesthete on the top ( Figs 4C, 4I ). The microsculpture of a specimen of Chaetopleura caboverdensis from the Cape Verde Archipelago ( Figs 4K, 4L ) is presented for comparison. This is the first report of this species for the São Tomé and Príncipe Islands.

Figures

Fig.4.(A–L) Chaetopleura caboverdensis (Kaas & Strack, 1986):(A–I) SãoTomé Island, ST03,(A–C) head valve, (A–B) dorsal and lateral views, (C) detail of the sculpture, (D–F) intermediate valve, dorsal, lateral and frontal views, (G–I) tail valve, (G–H) dorsal and lateral views, (I) detail of the sculpture; (J–L) Cape Verde Archipelago, São Vicente, Praia da Matiota, BD 2919: (J) complete specimen, (K) detail of the sculpture of the head valve, (L) detail of the sculpture of the tail valve.Scale bars = 1 mm (J); 500 μm (A, D, F); 400 μm (G); 300 μm (H); 200 μm (B, E); 50 μm (K, L); 40 μm (C); 30 μm (I).