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.