Xiphydria nagasei Shinohara 2019, sp. nov.
Creators: name: Shinohara, Akihiko
Publisher: name: Zenodo
Year: 2019
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Xiphydriidae
Xiphydria
Xiphydria nagasei

description: Xiphydria nagasei Shinohara, sp. nov.
(Figs 1H, I; 2E, F; 3E, F; 4C, D)
Xiphydria ogasawarai: Takeuchi, 1938: 181; Takeuchi, 1955: 116 (fig. 773 in pl. 53). Not Matsumura (1927).
Xiphydria alnivora: Nagase, 2007: 291 (part). Not Matsumura (1927).
Description. Female (holotype, Figs 1I, 2E, F, 3E). Length without ovipositor about 14.0 mm. Head capsule black, with large spot on lateral vertex and large mark covering lower inner orbit through malar space, gena along outer genal carina up to level of top of eye creamy white. Mandible black, medially with creamy white spot; palpi black, partly whitish. Antenna (Fig. 3E) black, with flagellum creamy white; most of flagellomere 1, dorsal and lateral surface of flagellomeres 2 and 3 and narrow tip of terminal flagellomere black; outer surface of flagellomeres 4–6 weakly darkened. Thorax black; tegula partly brownish. Legs black, with anterior tibia and base of tarsomere 1 pale brown. Wings slightly infuscated; veins and stigma blackish brown. Abdomen black, with lateral creamy white spots on terga 4–8, that on tergum 6 largest and those on terga 4 and 7 smallest.
Malar space broad (measured from ventral edge of head capsule to eye margin about 0.7 × length of distance between toruli), with shallow ventral pit; occipital carina (crassa) distinct, entire; genal carina (arrowed in Fig. 2F) developed nearly to vertex but their dorsal ends widely separated from each other; inner orbits slightly divergent below, interocular distance at level of toruli about 1.3 × eye height. Labial palpus with 3 palpomeres; maxillary palpus with 5 palpomeres. Both antennae with 17 antennomeres; scape (incl. radicula): pedicel: flagellomere 1: flagellomere 2 as 2.0:1.0:1.7:0.9. Hind tarsomere 1 about 0.8 × length of remaining tarsomeres combined; tarsal claws with large inner tooth. Sawsheath length about 0.9 × basal plate length.
Frons and interantennal area coarsely reticulate; lower inner orbit to lateral part of clypeus, malar space and gena shallowly finely striate; vertex and upper part of gena smooth, shiny, with few indistinct punctures. Pronotum with rough longitudinal or oblique rugae, anterior vertical margin broadly smooth; propleuron finely punctate and pilose. Mesoscutal median lobe coarsely reticulate on dorsal surface; lateral lobes reticulate with large elongate patch impunctate but dull and mat; mesoscutellum densely reticulate-punctate, large posterolateral parts rather smooth, with sparse rough punctures; mesepisternum rather shallowly, finely reticulate-punctate, with shiny interspaces, pilose all over; mesepimeron nearly impunctate and glabrous, coarsely and obliquely striate; metepisternum coarsely reticulate-punctate; metepimeron coarsely obliquely striate. Abdomen with tergum 1 coarsely finely punctate, each half with broad inner margin sparsely punctate with shiny interspaces; all other terga weakly shiny with very fine surface microsculpture.
Male (specimen from Futamata, Figs 1H, 3F). Length about 12.5 mm. Color pattern and structure similar to female holotype. Legs black, with tibiae and tarsi mostly pale brown; abdomen with creamy white lateral spots on terga 4–7. Both antennae with 18 antennomeres; tergum 9 apically roundly produced, dorsally rounded, without median longitudinal keel (Fig. 3F).
Variation. In both sexes: The large creamy white mark extending from inner orbit through malar space and gena up nearly to the lateral vertex is sometimes narrowly interrupted at the posterior part of the malar space. The lateral part of clypeus is often marked with dark amber or creamy white. Female: The length without ovipositor varies from 12.5 to 19.0 mm (partly estimated from damaged specimens without tip of abdomen). The antennal flagellomeres 4 and 5 are sometimes also partly black. There are 16–20 (usually 17) antennomeres (n=11), with the pedicel 1.1–1.3 (usually 1.2) × length of the flagellomere 2 (n=6). The abdomen has the creamy white lateral spots usually on the terga 3–8, the spot on the tergum 3 sometimes missing. The sawsheath length is about 0.9–1.0 × the basal plate length (n=4). Male: The length ranges from 10.0 to 14.0 mm. The antenna is black, with most of the flagellum (flagellomeres 3–5 to 12–14) largely creamy white, with 16–18 antennomeres (n=8). The abdomen sometimes has an additional obscure spot on the tergum 3 or 8.
Type material. Holotype (Figs 1I, 2E, F, 3E): ♀, Mt. Hinokiboramaru, 1200–1500 m, N35.28 / E139.05, Tan- zawa Mts., Kanagawa Pref., Honshu, Japan, 16. VI. 2015, K. Watanabe (NSMT). Paratypes: 5♀ 5³ from Japan [Honshu]. See Appendix for collection data.
Etymology. This new species is named in honor of Mr. Hirohiko Nagase, Kamakura, who has created a huge collection of all Hymenopteran groups and contributed to the clarification of Japanese fauna of these insects.
Distribution. Japan (Honshu).
Host plant. Unknown.
Remarks. This new species can be recognized by the creamy white malar space (Fig. 2F), large number of the antennomeres (16–20 [usually 17]) (Fig. 3E), mainly black legs (Fig. 1I), and the creamy white lateral spots usually on the terga 3–8 of the abdomen (Fig. 1I) in the female, and by the creamy white malar space, largely creamy white antennae (Fig. 1H) and the apically roundly produced, dorsally rounded tergum 9 of the abdomen (Fig. 3F) in the male.
In the keys to Xiphydria species of East Asia or Japan (Gussakovskij 1935; Takeuchi 1938; Togashi 1991), X. nagasei may run to X. alnivora. However, as discussed under X. ogasawarai, the characters given for X. alnivora in those keys are erroneous and X. ogasawarai and X. alnivora are synonymous. Xiphydria ogasawarai and X. nagasei are similar in having black legs but are distinguished by the characters given above. Xiphydria nagasei has been collected only on the mountains in central Honshu (Saitama and Kanagawa Prefectures) and western Honshu (Hiroshima Prefecture). This is now the only species of Xiphydria endemic to Honshu.
description: Published as part of Shinohara, Akihiko, 2019, The Xiphydria palaeanarctica group from Japan (Hymenoptera, Xiphydriidae), pp. 531-542 in Zootaxa 4608 (3) on pages 535-538, DOI: 10.11646/zootaxa.4608.3.7, http://zenodo.org/record/3066736