Stomion galapagoensis, GR WATERHOUSE

Finston, Terrie L. & Peck, Stewart B., 2004, Speciation in Darwin’s darklings: taxonomy and evolution of Stomion beetles in the Galápagos Islands, Ecuador (Insecta: Coleoptera: Tenebrionidae), Zoological Journal of the Linnean Society 141 (1), pp. 135-152 : 146-147

STOMION GALAPAGOENSIS GR WATERHOUSE

Stomion galapagoensis Waterhouse, 1845: 29 . Type locality: Floreana (= Charles) Island. Lectotype here designated with our red rectangular label, in BMNH: male from syntype series; left antenna missing beyond first segment; round label with blue edge: syntype; round label: Charles I., on reverse: 76 18; folded label: Stomion galapagoensis /GR Waterh. Seven additional specimens in syntype series. Waterhouse 1877: 79, 82. Howard 1889: 192. Mutchler 1925: 228, 236. Blair 1928: 672; 1933: 477. Van Dyke 1953: 71. Kaszab 1970: 187. Franz 1985: 92.

Stomion galapagoense Waterhouse, Linell 1898: 262 .

Stomion carinipenne Linell, 1898: 262 . Type in USNM. Type 1320 (examined). Type locality: Floreana (= Charles) Island. Label data: Charles I./ Galápagos Is./G. Baur collr. Red label: type 1320 USNM/ Stomion carinipenne type Linell. Mutchler 1925: 236. Blair 1933: 477.

Stomion carinatipenne Blair, 1933: 477 (misspelling).

Stomion piceum Linell 1898: 262 . Type in USNM. Type 1321 (examined). Type locality: ‘Chatham’ Island (mislabelled; lapsus for Floreana = Charles Island). Label data: ‘Chatham’ I./Acc 21,699/USFC. Red label: type no. 1321 USNM/ Stomion piceum type Linell. Mutchler 1925: 236. Blair 1933: 477.

Diagnosis: Length 8–10 mm, width 4–5 mm; body large, broad, and often flattened, 2¥ longer than wide; pronotum transverse, 1.4–1.5¥ wider than long, coarsely, but shallowly punctured, apical margin nearly straight, widest at middle, nearly as wide at base, but sometimes constricted; elytra with striae formed by deep punctures, single irregular row of fine punctures in the intervals between the striae; dorsal tooth of right mandible present but weak.

Distribution: Floreana Island, and its nearby satellite islets of Champion, and Gardner at Floreana. On Floreana it is known from: sites around Black Beach, Post Office Bay, inland from Las Cuevas, at the Ritter Farm, the Cruz Farm, Punta Cormoran and the summit of Cerro Pajas.

Bionomics: The species occurs in littoral and arid zone habitats, from sea level up to 550 m on summit of Cerro Pajas. Found under shrubs, in mangrove litter, at sea lion dung, and under stones on ash and soil, and on calcareous beach sand at night. Adults collected from January to August, and October and December. Examined: 395 specimens.