Clavicornaltica sakishimana Suenaga and Yoshida [Japanese name: Sakishima-higebuto-komaru-tobi-hamushi] (Figs 1a, 2a, d, g, 3a, b, 4a–d, 5a–c, 6a, b) Clavicornaltica sakishimana Suenaga and Yoshida 2016: 6 [type locality: Japan (Ishigaki-jima I.) and Taiwan]; Nakamura 2022: 20 [new record: Iriomote-jima I. and Yonaguni-jima I.]. Diagnosis. This species is distinguished from other Japanese species by the following features: body small and oval, 0.92–1.20 mm in length (Fig. 1a); elytral punctures shallow and indistinct, arranged in longitudinal rows; hind wing well developed in male (Fig. 3a) and degraded in female (Fig. 3b); aedeagus rounded anteriorly; apical margin notched at middle; lateral sides subparallel, gradually widened to apex (Figs 4 a, b); endophallus extremely long, and sclerotized part at near base inverted U-shaped with pair of projection at base (Figs 4a, 6a); spermatheca (Fig. 5a): receptacle slender, strongly bent, parallel laterally; pump long and cylindrical, projected at apex; spermathecal gland valve stout. This species is especially similar to C. doeberli Damaška and Aston, 2019, but distinguished by notched aedeagus at apex, and smoothly curved spermatheca. This species is also distinguished from similar species, C. vietnamensis Konstantinov and Duckett, 2005 and C. longsheng Konstantinov and Duckett, 2005 by parallel side of spermatheca (Fig. 5a). Redescription. BL: 0.92–1.20 mm (1.05±0.09, n = 11), BW: 0.60–0.74 mm (0.67±0.04, n = 11), PL: 0.22–0.28 mm (0.24±0.02, n = 11), PW: 0.50–0.60 mm (0.55±0.03, n = 11), EL: 0.68–0.82 mm (0.73±0.05, n = 11), EW: 0.24–0.40 mm (0.35±0.05, n = 11), HTL: 0.24–0.28 mm (0.26±0.02, n = 4). Body oval and convex. Coloration. Body pale brown (Fig. 1a). Antennae and legs yellowish brown. Head. Head rectangular, very shallowly and sparsely punctate (Fig. 2a); vertex smooth; frontal tubercles indistinct; frontal carina absent. Antennae: clava curved interiorly, straight exteriorly, apical margin of last antennomere somewhat truncate (Fig. 2d). Thorax. Pronotum lunate, somewhat convex, very shallowly and sparsely punctate. Scutellum subtriangular. Elytra somewhat convex, shallowly and sparsely punctate, punctures arranged in longitudinal rows. Hind wings well developed in male (Fig. 3a), and degraded in female (Fig. 3b). Metafemora oval, sparsely haired. Abdomen. Middle part of the second abdominal sternite with a sharply raised carina and seven to 21 coarse and strong punctures (Fig. 2g). Pygidium of male subtriangular with a pair of ridges in the middle. M a l e. Aedeagus rather slender (Figs 4a, 6a), strongly curved ventrally in lateral view (Figs 4b, 6b); apical margin weakly rounded, notched at middle (Fig.4a); lateral sides subparallel, gradually widened to apex.Endophallus extremely long and cylindrical, Y-shaped at base; sclerotized part at near base inverted U-shaped plate with pair of projection at bases (Figs 4a, 6a). Spicule V-shaped (Fig. 4c). Tegmen Y-shaped (Fig. 4d). F e m a l e. Spermatheca (Fig. 5a): receptacle slender, strongly bent, parallel laterally; pump long and cylindrical, projected at apex; spermathecal gland valve stout. Vaginal palpi deeply V-shaped, slender with five to six pores on middle and seven setae on apex (Fig. 5b). Tignum (Fig. 5c): sclerotized part spine-shaped, long and slender. Type material examined. Holotype: male (SEHU), “ èfiẹHḎmøflaeDz / JAPAN: OKINAWA / Ishigaki-shi / Mt.Yarabu-dake (FIT) / 18~ 20-X-2014 / Haruki Suenaga leg.” (typed on white card), “ Holotype / Clavicornaltica sakishimana / Suenaga and Yoshida, 2016 / Appended label by H. Suenaga, 2016 ” (typed on red card with black frame). Paratypes: Japan. [the Ryukyus] Okinawa Pref., Ishigaki-jima I.:; 9 ♁♁ (HSPC: HS-15-1, 2, 5, 8, 22-34, 23-14, 16), same data as the holotype; 1 ♁ (HSPC), Mt. Yarabu-dake, Ishigaki-shi, 7–8.IV.2011, T. Yoshida leg.; 3 ♁♁ (HSPC), same locality and collector, but 7–8.IV.2012; 3 ♁♁ (HSPC: HS-15-8), same locality and collector, but 13–14.IV.2012; 1 ♁ (HSPC: HS-15-6), same locality and collector, but 8–14.IV.2012. Taiwan. 1 ♁ (HSPC), Shuang-lien-bei, Yuanshan Hsiang, Ilan Hsien, 20–25.X.2005, T. Mizusawa and T. Mita leg. Additional material examined. Japan. [the Ryukyus] Okinawa Pref., Ishigaki-jima I.: 2 ♁♁ (HSPC: HS-14-21, 22), Mt. Yarabu-dake, Ishigaki-shi, 7–8.IV.2011, T. Yoshida leg.; 2 ♁♁ (HSPC), same locality and collector, but 8–14.IV.2012. Iriomote-jima I.: 2 exs. (HSPC), alt. 60 m, Ootomi-rindo, Haeminaka, Taketomi-chô, 23.VII.2017, F. Nakano leg.; 1 ♀ (HSPC: HS-22-4), Maera-gawa, Komi, Taketomi-chô, F. Nakano leg.; 2 ♁♁, 1 ex. (HSPC: HS-22-2, 8), alt. 90 m, Ushiku-no-mori, Taketomi-chô, 30.XI.2017, F. Nakano leg.; 1 ♁, 1 ex. (HSPC: HS-22-10), same locality and collector, but 23.XI.2018. Yonaguni-jima I.: 1 ♁, 2 exs. (HS-23-11, 13), Mantabaru, Yonaguni-chô, 24.I.2022, T. Matsuta leg. Distribution. Japan (Ryukyu Is.: Ishigaki-jima I., Iriomote-jima I. and Yonaguni-jima I.), Taiwan (Fig. 8).

Published as part of Suenaga, Haruki, 2023, Two new species of Clavicornaltica Scherer (Coleoptera, Chrysomelidae, Galerucinae) from the Ryukyu Islands, Southwestern Japan, with a redescription of C. sakishimana Suenaga and Yoshida, pp. 447-460 in Zootaxa 5301 (4) on pages 448-451, DOI: 10.11646/zootaxa.5301.4.3, http://zenodo.org/record/8035929