Two new species of Clavicornaltica Scherer (Coleoptera, Chrysomelidae, Galerucinae) from the Ryukyu Islands, Southwestern Japan, with a redescription of C. sakishimana Suenaga and Yoshida Author Suenaga, Haruki text Zootaxa 2023 2023-06-13 5301 4 447 460 http://dx.doi.org/10.11646/zootaxa.5301.4.3 journal article 10.11646/zootaxa.5301.4.3 1175-5326 8035929 F05230C6-0F99-46DA-9DA2-FAD081E960D3 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 ). FIGURE 1 . Habitus. a, Clavicornaltica sakishimana (HS-22-2); b, C . tokushigei sp. nov. (HS-22-13); c, C . nakanoi sp. nov. (HS-22-3). 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. FIGURE 2 . Head. a, Clavicornaltica sakishimana (HS-22-10); b, C . tokushigei sp. nov. (HS-22-9); c, C . nakanoi sp. nov. (HS-22-5). Antennae. d, C . sakishimana (HS-15-1); e, C . tokushigei sp. nov. (HS-21-39); f, C . nakanoi sp. nov. (HS-22-5). Abdomen. g, C . sakishimana (HS-22-10); h, C . tokushigei sp. nov. (HS-21-39); i, C . nakanoi sp. nov. (HS-22-12). 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. FIGURE 3 . Hind wing. a, Clavicornaltica sakishimana , male (HS-22-8); b, ditto, female (HS-22-4); c, C . tokushigei sp. nov. (HS-22-9); d, C . nakanoi sp. nov. (HS-22-12). 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 ).