Amblopusa pacifica ( Sawada, 1991 )

Tasaku, Yuto, Ono, Hiroki & Maruyama, Munetoshi, 2023, Review of the intertidal rove beetle tribe Liparocephalini Fenyes (Coleoptera, Staphylinidae, Aleocharinae) from Japan, Zootaxa 5383 (3), pp. 251-296 : 277-278

Amblopusa pacifica ( Sawada, 1991)

[Japanese name: Nokoba-umi-hanekakushi]

( Figs. 17B ; 18C & D ; 26A & B )

Boreorhadinus pacificus Sawada, 1991: 147 (original description; type locality: Akkeshi, east Hokkaido, Japan). Amblopusa “pacificus ”: Ahn & Ashe, 1995: 143 (as a junior synonym of A. brevipes ).

Amblopusa pacifica ( Sawada, 1991) : Zerche, 1998: 106 (characters; habitus photograph; phylogenetic analysis).

Material examined. Japan: Hokkaidô: 2 males, 3 females, 5 unsexed, Betsukai-chô, Odaitô , 23. VII. 2020, Y. Tasaku (cYT); 1 male, 1 female, 25 unsexed, Akkeshi-chô, Akkeshi-ko , 3. VIII. 2022, D. Sumikawa & Y. Tasaku ( KUM, cYT) ; 15 unsexed, Wakkainai-shi, Souya-mura, Higashiura, 20. IV. 2022, D. Sumikawa (cYT) ; 2 unsexed, Nemuro-shi, Shunkunitai , 11. IX. 1999, M. Maruyama ( KUM) .

Diagnosis. This species can be distinguished from other Amblopusa species by the combination of the following characteristics: body small (about 2.5 mm long); pronotum rather flattened with anterolateral margin angular ( Fig. 17B ); median lobe of aedeagus with apical lobe slightly swollen near apex in lateral view ( Fig. 18C ).

Distribution. Japan: eastern Hokkaidô ( Fig. 26A ).

Figures

FIGURE 17 Habitus of Amblopusa spp. A, A. magna; B, A. pacifica; C, A. brevipes; D, A.hokkaidona. Scale bar: 1.0 mm.

FIGURE 18 Genitalia of Amblopusa spp. A & B, A. magna (A, median lobe of aedeagus; B, spermatheca); C & D, A. pacifica (C, median lobe of aedeagus; D, spermatheca); E–G, A. brevipes (E, median lobe of aedeagus; F, spermatheca; G, apical lobe of paramere). Scale bars: 0.1 mm.

FIGURE 26 Distribution and habitat of Amblopusa spp. of Japan. A, known localities in Japan (red circle, A. magna; blue square, A. pacifica; yellow triangle, A. brevipes; green inverted triangle, A. hokkaidona); B, habitat of A. magna and A. pacifica (Wakkainai-shi, Hokkaidô, photographed by Daisuke Sumikawa); C, habitat of A. magna (Abashiri-shi, Hokkaidô).