Diaulota submarina Ahn, 2023

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 : 268

Diaulota submarina Ahn, 2023

[Chôsen-shiributo-umi-hanekakushi]

( Figs. 10 , 11 ; 24 & 25C )

Diaulota submarina Ahn, 2023: 141 (original description; type locality: Korea: Chungnam: Anmyeon Isl., Bangpo Beach). “ Diaulota uenoi ”: Ahn , 1996: 284 (misidentification).

Material examined. Japan: Honshû: Hiroshima-ken: 1 male, 1 female, Etajima-shi , Noumi-shima, Iwane, 19. IX. 2021, H. Yoshigou (cYT) ; Yamaguchi-ken: 1 male, Hagi-shi , Obara-hama, 28. II. 2016, M. Matsuda ( KUM) ; 1 female, Hagi-shi , Chintô, 4. V. 2015, M. Matsuda ( KUM) ; 1 female, Shimonoseki-shi , Chôfusangen’ya-kaigan, 3. II. 2015, M. Matsuda (cYT) . Kyûshû: Fukuoka-ken: 3 males, 1 female, Shikano-shima, 17. VI. 2022, Y. Tasaku (cYT) ; Nagasaki-ken: Tsushima: 2 males, 3 females, Izuhara-chô, Azamo, 15. VI. 2022, H. Ono (cHO); 1 male, ditto, 19. VI. 2022, Y. Tasaku (cYT).

Diagnosis. It is distinguished from other species of the genus except D. uenoi and D. orientalis sp. n. by the following combination of characteristics: ground color reddish brown, abdominal segments VI and VII black (sometimes segment V also black) ( Figs. 10A & B ); male head larger than that of female ( Fig. 10A & B ); mentum transverse ( Fig. 10D ); infraorbital carina short, shorter than half of head; tarsal formula 4-4-4. Compared to D. uenoi and D. orientalis sp. n., it can be distinguished by its polygonal apical sclerite, thin suspensonia and shape of spermatheca ( Figs. 11A, C, D, E, G & H ).

Variation. In the specimens from Tsushima and Fukuoka-ken, Kyushu: apical half of median lobe widened around apical 1/7–1/6 ( Fig. 11B ); suspensonia nearly S-shaped ( Fig. 11C ). In the specimens from Yamaguchi-ken and Hiroshima-ken, Honshû: apical half of median lobe almost parallel-sided ( Fig. 11F ); suspensonia thin rectangle shape ( Fig. 11G ).

Habitat. This species was collected from rocky shores ( Fig. 25C ).

Distribution. Japan: Honshû, Kyûshû, Tsushima ( Japan Sea side); South Korea ( Fig. 24 ). Newly recorded from Japan.

Figures

FIGURE 10 Habitus and mouthparts of Diaulota submarina. A, habitus, male; B, ditto, female; C, labium, D, mentum. Scale bars: 1.0 mm for A & B; 0.1 mm for C & D.

FIGURE 11 Genitalia of Diaulota submarina (A–D, from Tsushima; E–H, from Hiroshima-ken). A & E, median lobe of aedeagus, lateral view; B & F, ditto, ventral view; C & G, internal structure of median lobe, ventral view; D & H, spermatheca. Scale bars: 0.1 mm.

FIGURE 24 Distribution of Diaulota uenoi (red circle (red ring, type locality)), D. submarina (blue square), and D. orientalis sp. n. (yellow triangle).

FIGURE 25 Distribution and habitat of Rotundicephala gen. n. spp. of Japan. A, known localities in Japan (red circle, R. pacifica comb. n. (red ring, type locality)); blue square, R. koheii sp. n.; yellow triangle, R. koreana comb. n.); B, habitat of R. koheii sp. n. (Kanagawa-ken, Japan); C, habitat of R. pacifica comb. n. (Tsushima, adults of Diaulota submarina was collected same time).