Erythropompilus macroplacoideus Wu & Ma 2023, sp. nov.
Creators: name: Wu, Haiying
name: Li, Qiang
name: Ma, Li
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Pompilidae
Erythropompilus
Erythropompilus macroplacoideus

description: Erythropompilus macroplacoideus Wu & Ma, sp. nov.
Figs 2, 3, 4 (D–F)
urn:lsid:zoobank.org:act: 1DF79C9F-7F8D-41C7-BDAF-0253B503357F
Material examined. Holotype: CHINA, Yunnan, Jinghong, Menghai, Bulang Mountain, ♀, 21°45′N 100°26′E, 1683 m, Malaise trap, 17.V–25.VI.2021, coll. Yong-sheng Pu (YNAU). Paratypes: CHINA, Yunnan, 1♀ 1♁, same locality as holotype, 17.V–21.VI.2018, coll. Ling Zhao (YNAU).
Diagnosis. The new species is similar to E. taiwanensis Pitts & Shimizu, 2021 in having the following characteristics: frons strongly convex in profile (Figs 2C, 3C); clypeus less than LID (Figs 2D, 3D); ratio of POD/ OOD larger than 0.85; gena, in dorsal view, thickened, roundly receding posteriorly (Figs 2B, 3B); mid and hind femora without small spines set in pits apicodorsally; but markedly differs by the characters given in the Table 2.
Description. Female. (Measurements of the holotype are given in parentheses.) Length: Body 6.0–6.5 (6.5) mm; forewing 5.3–5.6 (5.6) mm. Body black, mandible red-brown at apical 1/3, mandible with 2 brown long setae on basal 2/5 (Fig. 2D), the following brown: beneath of scape, apical 1/6 of fore coxa and femur ventrally, fore tibia ventrally; Mesosoma orange-red, expect for collar, anterior margin of pronotum and lower 1/7 of mesopleuron, sometimes propodeum black (Figs 2A, 2J).
Head: Mandible with one inner tooth, clypeus slightly convex in lateral view, anterior margin nearly straight (Fig. 2D). In frontal view, head 1.25 × as broad as long; vertex distinctly convex between eye tops, frontal line fine and inconspicuous; MID large, 0.63–0.64 (0.64) as broad as TFD, UID: MID: LID = 8.5: 10: 7.5–8 (8); clypeus 2.3 × as broad as long, clypeus width less than LID (Fig. 2D). In dorsal view, ocellar area with several sparse punctures, ocelli in obtuse triangle, POD: OOD = 1: 0.9; antennocular line, in dorsal view, distinctly inclined from antennal base toward eye (Fig. 2B); F1 4.2 × as long as thick, 0.68 × as long as UID; length ratios of scape, pedicel, F1–F3 = 12: 5: 18: 16: 15. Flagellomeres with placoid sensilla on inner and external surfaces, external sensilla more than 3/4 each flagellomere, internal F1–F6 less than half of each flagellomere, apical 4 segments less than half of each flagellomere, gena slightly thickened, 0.3 × eye width (Fig. 2C).
Mesosoma: Lateral margin of pronotal dorsum, in dorsal view, anteriorly slightly narrower than posterior area, pronotum posterior margin slightly arcuate (Fig. 2E), pronotum conspicuously shorter than mesoscutum; in dorsal view, mesoscutum flat, slightly inclined towards posteriorly, parapsidal sulcus reaching nearly 5/6 of mesoscutum; scutellum disc raised, but not convex above level of mesoscutum; metanotum posterior margin extending at middle and covering partly postnotum, postnotum nearly 1/10 as long as metanotum, depressed medially and narrower than laterally (Fig. 2G). propodeum, in dorsal view, parallel-sided at anterior half, narrowing at posterior half, in lateral view, gently convex, posterior slope at apical 1/3; propodeal enclosure irregularly rugose, and with two longitudinal carinae medially.
Wing: Pterostigma long, about 5 × as long as 2r-rs (Fig. 2F); marginal cell removed from wing tip by 0.57 (0.5) × its own length; SMC2: SMC3 = 1: 1.6 on vein M, 1: 0.5 on vein RS; SMC2 broad on vein RS, equal to its length on vein M, receiving crossvein 1m-cu at basal 1/2; SMC3 narrowed on vein RS by 0.3 × its length on vein M, receiving crossvein 2m-cu at basal 0.6, removed from outer wing margin by 1.7 × its own length, crossvein cu-a originating basally to fork of vein M+CuA; HW crossvein cu-a arcute, originating much basal to fork of vein M+CuA.
Legs: Mid femur without small spines set in pits apicodorsally, mid tibia dorsally with 4 long brown spines externally and without spines internally, mid tibia ventrally with 2 small brown spines externally and 1 internally respectively; hind tibia dorsally with 6–7 long brown spines externally and 3–5 long brown spines internally, hind tibia ventrally with 1–3 small brown spines externally and 2 small brown spines internally. Longer spur of hind tibia 0.68 × hind tarsomere 1.
Male. Differs from female as follows: body length 4.0 mm; forewing 3.8 mm; antenna, clypeus, labrum, mandible basally, all legs and metasoma dark rufous; scape and pedicel ventrally, femur and tibia of fore leg pale brown; pronotum largely, mesoscutum and propodeum black (Fig. 3A).
Head: In frontal view, head 1.19 × as broad as long (Fig. 3D); MID large than female, 0.66 as broad as TFD, UID: MID: LID = 9: 10: 8.3; clypeus 2.5 × as broad as long, F1 2.7 × as long as thick, 0.44 × as long as UID; length ratio of scape, pedicel, F I–III = 10: 4: 12: 12: 13 (Fig. 3H), gena narrow, 0.25 × eye width (Fig. 3C).
Mesosoma: Notaulus of mesoscutum fine and short anteriorly and medially.
Wing: FW inner fasciae light, narrower than that in female, marginal cell removed from wing tip by 0.38 × its own length; SMC2: SMC3 = 1: 1.8 on vein M.
Legs: Mid tibia dorsally with 3 short brown spines externally, mid tibia ventrally without spine internally; hind tibia dorsally with 3 short brown spines externally and without spine internally.
Metasoma: Side of S4 and S5, each with tuft of sparse, erect and black bristles (Fig. 3J); S6 flat in basal 1/4, with oblique declivity in apical 3/4, posterior margin with inverted V-shaped edge (Fig. 3J); S6 with blade-like longitudinal keel far from posterior margin (Fig. 3J).
SGP and genitalia: Exposed portion of SGP narrowing apically, subbasally widest, rounded and translucent apically (Fig. 3K); in lateral view, SGP flat, with clearly triangular-shape ridge basally, and some sparse short setae in basal 2/3 (Fig. 3J). Paramere very short, peg-like (Fig. 4D); volsella narrow at basal 1/2, gradually broadened towards apex, rounded apically, and with several long setae at apical 1/3 (Fig. 4E); parapenial lobe slightly extending apex of volsella, inner margin entirely with fine and irregular serrate (Fig. 4F); aedeagus slightly longer than parapenial lobe, mostly parallel-sided, apical margin conspicuously concave medially (Fig. 4E).
Distribution. China (Yunnan).
Sex association. Not only were all the female and male specimens collected from the same Malaise trap, but they also have the same pattern and the following common characteristics: ratio of POD: OOD; clypeus <LID; in dorsal view, gena slightly thicken; frons strongly convex; and body color.
Etymology. The name macroplacoideus originates from the Greek word " mac "(=long, large) and " placoideus " (= placoid), referring to the flagellomeres of male with huge placoid sensilla.
description: Published as part of Wu, Haiying, Li, Qiang & Ma, Li, 2023, The spider wasp genus Erythropompilus Shimizu & Pitts, 2021 (Hymenoptera Pompilidae) in China, with description of two new species and an updated key to world species, pp. 160-172 in Zootaxa 5244 (2) on pages 164-169, DOI: 10.11646/zootaxa.5244.2.4, http://zenodo.org/record/7656174