The Sawfly Genus Spinarge (Hymenoptera, Argidae)
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Bull. Natn. Sci. Mus., Tokyo, Ser. A, 32(2), pp. 61–94, June 22, 2006 The Sawfly Genus Spinarge (Hymenoptera, Argidae) Hideho Hara1 and Akihiko Shinohara2 1 Hokkaido Forestry Research Institute, Koshunai, Bibai-shi, Hokkaido, 079–0198 Japan e-mail: [email protected] 2 Department of Zoology, National Science Museum, 3–23–1 Hyakunin-cho, Shinjuku-ku, Tokyo, 169–0073 Japan e-mail: [email protected] Abstract The genus Spinarge, previously represented by three Chinese species, is redefined to include 11 Palaearctic species, and is transferred from the Athermantini to the Argini of the Arginae. This genus is characterized by the fifth abdominal tergum with a dark median line (ϭin- conspicuous median groove) in the female and a long median process in the male. A key to the world species and descriptions or redescriptions of the following nine species are given: S. affinis sp. nov. from Japan, S. chrysoptera (Gussakovskij, 1935), comb. nov. from China, S. fulvicornis (Mocsáry, 1909), comb. nov. from Japan, Korea and China, S. flavicostalis sp. nov. from Japan, S. metallica (Klug, 1834), comb. nov. from Europe to Kamchatka, Primorskij kraj, Sakhalin and Korea, S. nigricornis sp. nov. from Japan, S. prunivora sp. nov. from Japan and Korea, S. pumila sp. nov. from Japan, and S. sichuanensis Wei, 1998, from China. Larvae are gregarious leaf feeders on broad-leaved trees such as Betula, Prunus and Sorbus. Key words : Hymenoptera, Argidae, Spinarge, new species. Spinarge Wei, 1998, is a small genus of the tergum. The process is a very peculiar and un- sawfly family Argidae (Hymenoptera), so far rep- questionably an apomorphic character state that resented by three Chinese species, S. sichuanen- indicates the close relationships of these species sis Wei, 1998, S. liui Wei, 1998 and S. hyalina and the three known species of Spinarge. In this Wei & Nie, 1998. Wei (1997, 1998) character- paper, we redefine Spinarge to include all these ized this genus principally by having the male species, place the genus in the Argini, and de- fifth abdominal tergum with a long median scribe or redescribe nine species of the genus. process and the combination of the middle tibia All the material used in this paper is kept in with a preapical spur and the hind tibia without a the National Science Museum, Tokyo, unless preapical spur, and placed this genus in his otherwise indicated. Abbreviations for deposito- “Athermantinae” (ϭthe Athermantini of the ries are as follows: EU – Ehime University, Ma- Arginae of Benson, 1963). The Athermantini are tsuyama; HNHMB – Hungarian Natural History separated from the Argini only by the middle and Museum, Budapest; HNC – H. Nagase collection, hind tibiae without a preapical spur (the Argini Kamakura; HSC – H. Suda collection, Sakura; have these tibiae with a preapical spur) (Benson, HU – Hokkaido University, Sapporo; IZB – Insti- 1938, 1963). In the condition of the preapical tute of Zoology, Beijing; KNC – K. Nakamura spurs, therefore, Spinarge agrees neither with the collection, Utsunomiya; KU – Kobe University, Athermantini nor with the Argini. Kobe; MNHAH – Museum of Nature and Human We noticed that the males of several species of Activities, Hyogo, Sanda; MYC – M. Yamada “Arge” with a preapical spur both on the middle collection, Hirosaki; OMNH – Osaka Museum of and hind tibiae, as the Argini, have a long con- Natural History, Osaka; OPU – Osaka Prefecture spicuous median process on the fifth abdominal University, Sakai; RMNHL – Nationaal Natu- 62 Hideho Hara and Akihiko Shinohara urhistorisch Museum, Leiden; TMC – T. Muraka- with posterior length (distance between posterior mi collection, Nikko; TSC – T. Saito collection, ends of veins Rs and 2r–m) 0.8–1.8ϫ posterior Yaita; ZSSM – Zoologische Staatssammlung, length of cell 1Rs2; hindwing with cell R closed München. and cell A closed; apical margins of wings be- tween apices of veins Rs and Cu narrowly Spinarge Wei, 1998 glabrous, with setae generally about as long as or slightly longer than width of vein M (Fig. 7A). Spinarge Wei, 1997: 297. [Nomen nudum.] Spinarge Wei & Nie, 1998 (August): 347, 380. [Nomen Fifth abdominal tergum with inconspicuous me- nudum.] dian groove (linear apodeme or thickening ap- Spinarge Wei, 1998 (September): 219. pearing as dark line inside), its apex usually slightly convex or produced on posterior margin Type species. Spinarge sichuanensis Wei, of tergum in female (Fig. 7B–C), with long me- 1998, original designation. dian process in male (Fig. 7D–J). Fourth tergum Diagnosis. Length 7.2–11.9 mm in female, usually with dark median line (linear apodeme or 7.2–9.5 mm in male. Black (Figs. 1–2). Head thickening appearing as dark line inside) (Fig. 7 width 0.7–0.9ϫ thorax width, 1.3–1.4ϫ head B–C). Female seventh sternum (Fig. 7K) postero- height. Occipital carina indistinct. Frons to supra- medially slightly depressed and glabrous. Saw- clypeal area medially protruding. Inner margins sheath (Fig. 8) robust, with dorsal side sunk of eyes barely or slightly concave dorsally, slight- basally; inner side spinose. Lancet (Figs. 9–10) ly converging below (Figs. 3–4). Interantennal not spinose, without dorsally projecting hairs, area laterally carinate, with width 0.2–0.3ϫ dis- without large gap between second and third ser- tance between eyes. Clypeus with very weak dull rulae. Gonostipes with apical width about as long dorsal ridges extending from ventral end of me- as basal width of harpe (Fig. 14); valviceps with dian supraclypeal ridge toward lateral extremities small lateral lobe posteriorly (Fig. 14B, E, G, K) of clypeus; ventral margin medially concave or without it (Fig. 14I), in lateral view anteriorly roundly, laterally convex roundly. Postclypeal su- with large ventral lobe (Fig. 15). ture absent. Flagellum (Figs. 5–6) with sharp Surface generally smooth and shining, with ventral longitudinal carina almost throughout and punctures very fine and sparse; frons to clypeus not or weakly compressed in both sexes, ventral- and their adjacent areas relatively distinctly ly with long bristles generally arranged in short punctured (Figs. 3–4); surfaces of dorsal side of transverse rows in male. Mandibles (Fig. 4C) antenna, tibiae and tarsi not or slightly granulate; without inner teeth. In maxillary palpus, sixth dorsal parts of second to fifth abdominal terga (apical) segment slightly longer than fifth seg- mostly glabrous; dorsal sides of sixth and more ment and 1.3–2.3ϫ apical height of fore tibia, posterior abdominal terga setose in female (Fig. fourth segment slightly wider than fifth segment. 7C), medially glabrous in male (Fig. 7D–J). Pronotum laterally with furrow. Fore and middle Immature stages (based on S. fulvicornis, S. tibiae not compressed; hind tibia slightly com- prunivora and S. flavicostalis). Larva: Antenna pressed; middle tibia with preapical spur; hind conical, 1-segmented; each thoracic leg with tibia with or without preapical spur; tibial spurs tarsal claw and enlarged apical pad (empodium); simple, tapering apically; tarsal claws simple; first to ninth abdominal segments each three-an- hind first tarsomere 0.9–1.1ϫ following three tar- nulate; second to sixth and tenth abdominal seg- someres combined in length. Forewing (Figs. ments with pair of prolegs. 1–2) with apical section of vein Sc complete, Cocoon: Oval, double walled; outer wall net- vein RϩM punctiform or shorter than apical sec- ted; inner wall parchment-like. Made in soil or tion of vein Sc, crossveins 2r–m and 3r–m com- leaf litter in cage. plete, cell R closed, cell 1A closed and cell Rs Gender. Although Wei & Nie (1998) treated Sawfly Genus Spinarge 63 Fig. 1. Spinarge spp. —— A–B, S. fulvicornis (Mocsáry), /, holotype; C, do., ? (No. HH040711D), Hokkaido; D, do., middle instar larva (No. HH040711D); E–F, do., final instar larvae (No. HH040711D); G, S. prunivo- ra sp. nov., /, holotype; H, do., ?, paratype (No. HH040731A), Hokkaido; I, do., middle instar larvae (No. HH040731A); J, do., final instar larva (No. HH040731A); K, do., mature larva, Aoki-ko, Honshu; L, S. prunivora sp. nov., /, paratype, Ichinomiya, Honshu; M, S. affinis sp. nov., /, holotype; N, S. pumila sp. nov., /, holotype; O, S. sp. ( fulvicornis group), ?, Yokohama, Honshu. 64 Hideho Hara and Akihiko Shinohara Fig. 2. Spinarge spp. —— A, S. metallica (Klug), /, Sosninskij River, Russia; B, do., ?, Sosninskij River, Rus- sia; C, S. flavicostalis sp. nov., /, holotype; D, do., ?, paratype, Asahidake-onsen, Hokkaido; E, middle instar larvae (No. HR920713E), Hokkaido; F, S. nigricornis sp. nov., /, holotype; G, do., ?, paratype, Mt. Sankakuyama, Hokkaido; H, S. chrysoptera (Gussakovskij), /, Mt. Zheduoshan, China; I, S. sichuanensis Wei, /, Mt. Taibaishan, China. this genus as masculine, we regard it as feminine, an unavailable genus name, because it dose not because Spinarge is undoubtedly a compound fulfill the requirements of the ICZN (1999). word, spina (a thorn)ϩArge, and Arge has been Spinarge is distinguished from the other argid always treated as feminine. genera in having the fifth abdominal tergum with Remarks. The name Spinarge first appeared a dark median line and usually slight posterome- in the key to the Palaearctic and Oriental genera dial convexity in the female (Fig. 7B–C) and of the Argidae by Wei (1997) and then Wei & with a long median process in the male (Fig. Nie (1998) described a new species, “Spinarge 7D–J). These character states are quite unique to hyalinus”. However, Spinarge in these papers is this genus in the Argidae and probably in all Sawfly Genus Spinarge 65 Fig. 3. Heads of Spinarge spp. —— A–B, S. fulvicornis (Mocsáry), /, holotype; C–D, do., ? (No. HH040711D), Hokkaido; E–F, S. prunivora sp. nov., /, holotype; G–H, do., ?, paratype (No. HH040731A), Hokkaido; I–J, S. affinis sp. nov.,/, holotype; K–L, S. pumila sp. nov., /, holotype. sawfly families, and strongly support the mono- males of the species with a preapical spur on the phyly of the genus.