Caliroa ibukii Hara, 2020

Hara, Hideho & Ibuki, Shinichi, 2020, Caliroa slug sawflies of Japan (Hymenoptera, Tenthredinidae), Zootaxa 4768 (3), pp. 301-333 : 315-316

Caliroa ibukii Hara , sp. nov.

( Figs 1I, J, N , 3G, Q , 4G, H , 5D , 7 G–I, 11G–I)

Description: female and male. Length 4.5 mm in female, 3.5 mm in male. Black, shiny with colorless reflection

( Fig. 1I, J ). Labrum black. Mandible black, apically reddish brown. Palpi black. Legs black; fore and middle legs yellow brown to dark brown from apices of femora to tarsi; hind femur brown at narrow apex; fore and middle tibial spurs yellow, hind tibial spurs dark brown; claws brown. Wings slightly grayish on basal two-thirds, colorless transparent on apical third in female ( Fig. 1I ), slightly grayish uniformly in male; veins and stigma black.

Postocellar area 2.1–2.2 × as wide as length behind lateral ocellus, without anterior groove. Clypeus roundly emarginated on ventral margin ( Fig. 3G ); depth of emargination 0.3 × median length of clypeus. Malar space linear, about as wide as facet of eye in female, narrower than facet in male; setae absent. First flagellomere 0.9 × as long as second and third flagellomeres combined ( Fig. 3Q ); apical four flagellomeres combined 0.9–1.0 × as long as first flagellomere. Forewing with joint of vein Rs with crossvein 2r-rs located at apical 0.48–0.53 of anterior margin of cell 1Rs2 ( Fig. 1I ); basal corner of cell 1M nearly right-angled. Female hind wing with joint of vein 1A and crossvein cu-a located basal to apex of cell 1A ( Fig. 4G ); crossveins 2r-m and m-cu present. Male hind wing with marginal vein ( Fig. 4H ); crossveins 2r-m, m-cu and cu-a absent; apex of cell 1A rather close to wing margin, and section of marginal vein in cell Cu separated from wing margin at its posterior third.

Punctures mostly minute or inconspicuous. Head and thorax mostly smooth. Mesoscutellum with only minute punctures ( Fig. 5D ). Mesoscutellar appendage mostly setose. Dorsum of abdomen smooth in female, slightly reticulately microsculptured on middle terga in male.

Lance ( Fig. 7G, H ) with dorsal margin serrate on apical half; serrations rounded. Lancet ( Fig. 7G, I ) with 13 serrulae; ctenidia darkened, widely separated from ventral margin of lancet; serrulae, except for apical ones, each with large outer extension; middle serrulae deep, with two to three anterior teeth, three to four posterior teeth and one large posterior notch, and outer extension shallow, widened apically and slightly concave on apical margin; areas between middle serrulae slightly convex, wider than adjacent serrula.

Male genitalia ( Fig. 11 G–I) in ventral view with harpe widest at middle, slightly rounded on lateral margin and angularly convex on medial margin. Penisvalve slightly hooked apically.

Immature stages. Final feeding instar (semifinal instar) larva ( Fig. 1N ): length about 8 mm; slime black. Final instar larva entirely yellow.

Material examined. Holotype ( Figs 1I, J , 3G, Q , 4G , 5D , 7 G–I): ♀, “ JAPAN, Honshu , Tochigi Pref., Nak- agawa, Wami, coll. larva on Celtis sinensis 5. VII. 2018, mat. 7. VII., em. 21. VII. 2018, S. Ibuki ” . Paratype: 1♂, same data as holotype but, mat. 9. VII., em. 8. V. 2019.

Etymology. This new species is named after Shinichi Ibuki who discovered this sawfly.

Distribution. Japan: Honshu.

Bionomics. Host plant: Cannabaceae : Celtis sinensis Pers.

Ibuki collected two larvae on C. sinensis in his garden on July 5, 2018. They solitarily fed on the under surface of a leaf ( Fig. 1N ). In the rearing room, the larvae matured on July 7 and 9, 2018. One female adult (the holotype) emerged on July 21, 2018, and one male adult emerged on May 8, 2019. This sawfly has polymodal adult emergence and one or two generations a year.

Remarks. This species is easily distinguished from other congeners except for C. cerasi in having a black body without colored reflection, an entirely dark hind leg and very slightly darkened wings ( Fig. 1I ). This species and C. cerasi are distinguished as stated in the key above. This species is unique in having double serrulae on a lancet ( Fig. 7 G–I).

Figures

FIGURE 1. Female adults (A–J) and immature stages (K–T). A, B, Caliroa cerasi, female, Sapporo. C, D, K, L, C. bibaiensis: C, D, female, holotype; K, L, late instar larvae on Crataegus chlorosarca, Bibai, 6 August 2009. E–H, M, C. oishii: E, F, female, holotype or paratopotype of C. oishii; G, H, female, holotype of C. quercivora; M, late instar larva on Quercus crispula, Shintoku, 28 August 1993. I, J, N, C. ibukii: I, J, female, holotype; N, final feeding-instar larva, 6 July 2018. O, C. staphyleae, late instar larvae on Staphylea bumalda, Nakagawa, 9 July 2012. P–S, C. zelkovae: P, eggs in Zelkova serrata, Nakagawa, 30 June 2010; Q, young larvae on Z. serrata, Nakagawa, 26 June 2014; R, middle and late instar larvae on Z. serrata, Nakagawa, 30 June 2010; S, late instar larva on Prunus domestica, Nakagawa, 8 July 2012. T, C. nire, late instar larva on Ulmus pumila, holotype, Shintoku, 21 August 2011. A, C, E, G, I, dorsal or dorsolateral view. B, D, F, H, J, ventral or ventrolateral view. K–M, T, photographed by H. Hara. N–S, photographed by S. Ibuki.

FIGURE 3. Heads (A–M), antennae (N–W) and hind tarsus (X). A, K, L, V, Caliroa zelkovae: A, K, female, Nakagawa, host Ulmus davidiana var. japonica; L, V, female, lectotype. B–D, N, X, C. cerasi, female: B–D, N, Shimizu; X, Sapporo. E, O, C. bibaiensis, female, holotype. F, P, C. oishii, female, holotype or paratopotype. G, Q, C. ibukii, female, holotype. H, R, C. vaccini, female, paratype. S, C. ouensis, female, holotype. I, T, C. aizankei, female, holotype. J, U, C. staphyleae, female: J, paralectotype; U, lectotype. M, W, C. nire, female, holotype. A, B, dorsal view. C, anterolateral view. D–M, frontal view. N–W, inner or outer lateral view. X, anteroventral view. P, Q, U, X, reversed.

FIGURE 4. Hind wings, dorsal view. A–C, Caliroa cerasi: A, female, Sapporo; B, female, Shimizu; C, male, Finland. D, C. bibaiensis, female, holotype. E, F, C. oishii: E, female, holotype or paratopotype; F, male, Shintoku. G, H, C. ibukii: G, female, holotype; H, male, paratype. I–K, C. vaccini: I, female, paratype; J, female, holotype or paratype; K, male, paratype. L, C. ouensis, female, holotype. M, C. aizankei, female, holotype. N–P, C. staphyleae: N, female, lectotype; O, female, Nakagawa; P, male, paralectotype. Q, R, C. zelkovae: Q, female, lectotype; R, male, Hobara. S, C. matsumotonis, male, Korea. T, C. nire, female, holotype. A, C, D, F, J, K, reversed.

FIGURE 5. Mesoscutellar appendages and adjacent areas, dorsolateral view (A–M) and first to third abdominal terga, dorsolateral view (N–P). A, N, Caliroa cerasi, female: A, Shimizu; N, Sapporo. B, O, C. bibaiensis, female: B, paratype; O, holotype. C, C. oishii, female, Mikasa. D, C. ibukii, female, holotype. E, C. vaccini, female, paratype. F, C. ouensis, female, paratype, Mt. Zao-san. G, C. annulipes, female, Austria. H, C. nara, female, Kamikawa. I, C. aizankei, female, holotype. J, C. staphyleae, female, lectotype. K, C. zelkovae, female, lectotype. L, C. matsumotonis, female, lectotype. M, P, C. nire, female, holotype.

FIGURE 7. Lances and lancets (A, B, E, G), apices of lances (C, H) and middle ventral parts of lancets (D, F, I). A–F, Caliroa oishii: A–D, holotype or paratopotype of C. oishii; E, F, holotype of C. quercivora. G–I, C. ibukii, holotype. 1, 5, first (most basal), fifth serrula.A, G, I, reversed.

FIGURE 11. Male genitalia in ventral view (A, D, G, J, M, P, S, V), penis valves in dorsal view and lateral view, left dorsal (B, C, E, F, H, I, K, L, N, O, Q, R, T, U, W, X). A–C, Caliroa cerasi, Finland. D–F, C. oishii, Shintoku. G–I, C. ibukii, paratype. J–L, C. vaccini, paratype. M–O, C. ouensis, paratype. P–R, C. staphyleae, Nakagawa. S–X, C. zelkovae: S–U, Hobara; V–X, Nakagawa, host Prunus domestica.