Rotundicephala koreana ( Yoo & Ahn, 2021 ) Tasaku & Ono & Maruyama, 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 : 273-274

Rotundicephala koreana ( Yoo & Ahn, 2021) , comb. n.

[Japanese name: Sazare-umi-hanekakushi]

( Figs. 14C ; 15C, D & H ; 25A )

Diaulota koreana Yoo & Ahn, 2021: 551 (original description; type locality: Gyeongnam Prov.: Tongyeong-si, Sanyang-eup, Is. Mireukdo).

Material examined. Honshû: Hiroshima-ken: 1 male, 15 unsexed, Kure-shi , Kurahashi-chô, Kurahashi-jima (Umikoshi), 1. II. 2009, K. Nakano ( KUM) ; Yamaguchi-ken: 5 unsexed, Kaminoseki-chô, Naga-shima, 1. V. 2008, M. Moriguchi ( KUM) . Shikoku: Kagawa-ken: 1 male, 1 female, 8 unsexed, Higashikagawa-shi , Matsubara , Kaburagoshi-kaigan, 6. V. 2014, T. Taki (cYT) ; 1 unsexed, ditto, 23. V. 2016, T. Taki (cYT) ; 6 unsexed, ditto, 21. III. 2021, T. Taki (cYT) ; 1 male, Higashikagawa-shi , Koiso , Koura-kaigan , 27. V. 2017, T. Taki (cYT) ; 3 unsexed, Marugame-shi , Hon-jima, Kôshô, 30. IV. 2017, H. Fujimoto . Kyûshû: Ôita-ken : 1 male, Ôita-shi , Shûki , 5. IV. 2023, S. Akamine ( KUM) ; Nagasaki-ken : Tsushima : 1 unsexed, Izuhara-machi, Azamo, 15. VI. 2022, H. Ono (cHO) ; 1 female, 3 unsexed, ditto, 18. VI. 2022, H. Ono (cHO) ; 1 male, 1 female, 4 unsexed, ditto, 19. VI. 2022, Y. Tasaku (cYT) .

Diagnosis. This species is similar to other species of Rotundicephala , but can be distinguished by the long antennae reaching to elytra ( Figs. 14C ; 15H ).

Habitat. In our survey in Tsushima, unlike other species of this genus that occur in rock crevices, this species was collected from under pebbles on the intertidal zones of gravel beach (1.5–20 mm in diameter), together with the members of other intertidal aleocharine genus Bryothinusa Casey, 1904 . This habitat preference is an important piece of information other than morphological information to readily identify this species.

Distribution. Japan: Honshû, Shikoku, Kyûshû, Tsushima; South Korea ( Fig. 25A ). Newly recorded from Japan.

Figures

FIGURE 14 Habitus of Rotundicephala gen. n. spp. A, R. pacifica comb. n.; B, ditto, female; C, R. koreana comb. n.; D, R. koheii sp. n., male (holotype). Scale bar: 1.0 mm.

FIGURE 15 Genitalia and antenna of Rotundicephala gen n. A, B & G, R. pacifica comb. n. (A, median lobe of aedeagus; B, spermatheca; G, right antenna); C, D & H, R. koreana comb. n. (C, median lobe of aedeagus; D, spermatheca; H, right antenna); E, F & I, R. koheii sp. n. (E, median lobe of aedeagus; F, spermatheca; I, right antenna). Scale bars: 0.1 mm.

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).