Dactylosternum abdominale (Fabricius, 1792)

(Figs. 1, 20, 40, 47, 67)

Sphaeridium abdominale Fabricius, 1792: 79 . Type locality: Antilles.

For complete synonymy, see Hansen (1999).

Type material: not examined.

Material examined. CHINA: Guangdong: 24 spec. (SYSU), Shipai Cattle Camp, 25.VII.1985, Wu leg. ; 24 spec. (SYSU), Henan Cattle Camp, 10–25.X.1985, Wu leg. ; 5 spec. (SYSU), Guangzhou, Yingzhou Ecological Orchard, in the rotten banana root, 29.VIII.2010, Jia leg. ; 5 spec. (SYSU), Foshan Prefecture, Sanshui District, in the rotten banana tree, 23.VIII.2012, Jia & Song leg. ; 6 spec. (SYSU), Guangzhou, Haizhu District, Wanmu Orchard, 27.VIII.2012, Song leg. ; 14 spec. (SYSU), Fengkai County, Heishiding, 23°31′N 111°52′E, in the rotten bamboo, 21.I.2014, Lin leg. ; 7 spec. (SYSU), Shenzhen, Dapeng District, Shenshuitian, 22°38′36″N 114°26′16″E, 40 m, in the rotten wood, 23.VII.2019, Liang, Yang, Jiang & Ji leg. ; Guangxi: 1 spec. (SYSU), Baise Prefecture, Pingguo County, Matou Town, in the farmyard manure, 23.350213°N, 107.559134°E, 103 m, 28.IV.2021, Bao-ping Huang & Zu-qi Mai leg. ; Macao: 3 spec. (SYSU), Dangzai Mangrove Reserves, 22°8′24″N 113°33′11″E, 12 m, in the rotten banana tree, 16.I.2021, Jia & Mai leg. ; Nei Mongol: 1 female (SYSU), Yitulihe Town, 13–15.VIII.2008, Jia leg. JAPAN: Kagoshima Pref.: 1 spec. (SSC), Amami Is, Tokunoshima I., 26–29.VI.2011, S. Sakurai leg. ; Okinawa Pref.: 2 spec. (SSC, KMNH), Miyako-jima I., 26–28.ii.2005, S. Sakurai leg.; 1 male (KMNH), Yonaguni-jima I., Sonai, 25.xii.2005; Y. Minoshima leg. ; 1 male, 1 spec. (KMNH), Yonaguni-jima I., Sonai, 24°27.9′N, 123°00.2′E, 29.xii.2005, at light, Y. Minoshima leg.

Additional material examined. VIETNAM: 1 spec. (FEFU), Hanoi Hotel Kim-lien, 1–2.V.1966, Exp. Gy. Topál, Nr. 245, from decaying banana tree, Dactylosternum abdominale (Fabricius), Det. M. Sato , 1980; 1 spec. (FEFU), Hanoi Hotel Kim-lien, 1–2.V.1966, Exp. Gy. Topál, Nr. 244, singled from carcass of rat, Dactylosternum abdominale (Fabricius), Det. M. Sato , 1980.

Diagnosis. Length 4.4–5.0 mm, maximum width 2.5–2.8 mm. Body oblong oval, anterior half of elytra nearly parallel-sided (Fig.1); elytra weakly convex.Dorsal black to dark brown.Anterior margin of clypeus without marginal rim. Clypeus, posterior margin of vertex and lateral portion of pronotum with distinct mesh-like microsculpture between punctures (Fig. 47). Antenna yellow-brown, with club black to yellow-brown, club compact (Fig. 40). Elytron with sutural stria and 10 rows of serial punctures, all nearly reaching elytral base. Aedeagus (Fig. 20) ca. 1 mm long. Phallobase ca. 0.6× as long as parameres. Parameres slender, mostly membranous in apical half, truncate and widened apically; the widening is often not distinct due to modification of membranous apex during preparation or due to an intraspecific variation. Median lobe shorter than parameres, ca. 0.7× as long as parameres, moderately stout, elongate, triangular, tapering towards apex; apex of median lobe abruptly tapered with rounded apex. Gonopore situated subapically.

For detailed description see Smetana (1978) and Hansen (1991).

Biology. (Figs. 65, 67) Found in various types of decaying organic matter, such as rotting plant tissues, domestic waste or farmyard manure, in China often associated with decaying trunks of banana plants and the farmyard manure. Adult individuals are attracted by light .

Distribution. China (Nei Mongol, Guangdong, Guangxi, Macao); Japan (Honshu, Kyushu, Nansei-shotô Islands, Ogasawara Islands (e.g., Nakane 1970; Hirano 1985; Satô 1985; Entomological Laboratory & Japan Wildlife Research Center 1989). New for Nei Mongol, China. Outside China and Japan recorded from the following regions: Afrotropical: Benin, Cape Verde Is., Comoros, Guinea, Ivory Coast, Madagascar, Mascarene Is., Nigeria, Senegal, Seychelles, South Africa, Togo, Yemen, Zaire. Palearctic: Algeria, Azores, Canary Is., Croatia, Cyprus, Egypt, France, Germany, Greece, Hungary (Lõkkös 2009), Italy, Japan, Madeira, Spain, Syria, Tunisia. Oriental: Andaman Is., Christmas Is., India, Indonesia (Java, Sumatra), Malaysia (Peninsula), Philippines, Singapore, Sri Lanka, Australian: Australia, Fiji, New Caledonia, New Guinea, New Zealand, Gambier Is., Hawaiian Is., Marquesas Is., Samoa, Society Is., Neotropical: Argentina, Brazil, Cuba, Jamaica, Lesser Antilles, Mexico, Nearctic: U.S.A. (Hansen 1999).