Amblopusa Casey, 1894

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

Genus Amblopusa Casey, 1894

[Japanese name: Nokoba-umi-hanekakushi-zoku]

Amblopusa Casey, 1894: 355 (original description; type species: A. brevipes Casey, 1894 ); Ahn & Ashe, 1995: 138 (redescription; key to species).

Boreohadinus Sawada, 1991: 147 (original description; type species: B. pacifica Sawada, 1991 ).

Diagnosis. This genus is similar to Halorhadinus in body shape but can be distinguished by the following characteristics: hind wings usually absent; female spermatheca not coiled or coiled one time ( Figs. 18B, D & F ); mandible slightly longer than wide ( Fig. 19E ); labrum transverse ( Fig. 19A ); one medial seta presents on prementum ( Fig. 19C ) (modified after Sawada, 1991). From other genera of Liparocephalini , this genus can be easily distinguished by the combination of the following characteristics: body slender; abdominal segments III–VII almost parallel-sided ( Fig. 17 ); labial palpus 2-segmented, ligula reaching to 1/2 of segment I of labial palpus ( Fig. 19C ).

Habitat. All species of this genus have been collected from gravel beaches ( Figs. 26B & C ).

Distribution. Japan: Hokkaidô; Russia (Kuril Islands); Canada; USA.

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 19 Mouth parts of Amblopusa brevipes. A, labrum (right side, dorsal view; left side, ventral view (epipharynx)); B, mentum; C, labium; D, maxilla; E, right mandible. 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).