Stigmus clypeglabratus Li & Ma 2024, sp. nov.
Creators: name: Li, Jinghong
name: Li, Qiang
name: Ma, Li
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Crabronidae
Stigmus
Stigmus clypeglabratus

description: Stigmus clypeglabratus Li & Ma sp. nov.
Figs 2 A – M, 7 C, D
Type material.
Holotype: China • ♀; Shaanxi, Hanzhong City, Liuba County, Zibai Mountain; 33 ° 40 ′ N, 106 ° 43 ′ E; 3. VIII. 2004; 1632 m elev.; coll. Min Shi; sweep net (YNAU). Paratypes: 3 ♂♂, same data as for holotype, except coll. Min Shi, Qiong Wu (YNAU).
Diagnosis.
Differs from S. japonicus Tsuneki, 1954 by hindwing media diverging before cu-a; lateral surface of propodeum smooth and shiny anteriorly and medially; pronotal collar with incomplete lateral rugae, just distinct in posterior area; gena impunctate dorsally; opaque area larger than hind ocellus; in male, clypeus smooth and impunctate, and with several setae on free margin, yellowish and short; in female, pygidial area smooth, impunctate. Stigmus japonicus has the following characters: hindwing media diverging beyond cu-a; lateral surface of propodeum with dense, slender or sturdy, oblique, longitudinal rugae anteriorly and medially; pronotal collar without lateral rugae; gena with sparse, midsize punctures dorsally; opaque area smaller than hind ocellus; in male, clypeus with dense, tiny punctures, setae on clypeus dense, silvery, and short; in female, pygidial area with two lines of large punctures medially.
Description.
Female. Measurements. ♀, BL: 4.2 mm; HW: HLD: HLF = 61: 36: 47; HW: EWd: EW: TW: EL = 61: 16: 21: 16: 39; POD: OOD: OCD = 5: 11: 16; length of scape: length of pedicel: length of flagellomere I: width of flagellomere I: length of flagellomere II: width of flagellomere II = 18: 6: 6: 3: 7: 3.5; PL: PW: LTI: WTI: HFL: HTL = 26: 8: 32: 35: 35: 40. ♂, BL: 3–3.8 mm; HW: HLD: HLF = 63: 32: 48; HW: EWd: EW: TW: EL = 63: 19: 23: 13: 41; POD: OOD: OCD = 6.5: 11: 14; length of scape: length of pedicel: length of flagellomere I: width of flagellomere I: length of flagellomere II: width of flagellomere II = 16: 7: 5: 3: 6: 3; PL: PW: LTI: WTI: HFL: HTL = 26: 8: 29: 34: 34: 40.
Color pattern. Body black; clypeus with reddish brown band subapically; mandible yellowish except reddish brown apically; labrum and dorsal scape fulvous; palpi and ventral scape ivory; pedicel, pronotal lobe, tegula and forewing veins yellowish; flagellomeres beneath and I-II above fulvous, remainder reddish brown; fore and mid legs: yellowish to fulvous except outer margin of femur somewhat brown, coxa dark brown largely; hind leg: coxa apically, trochanter, basal 1 / 2 of tibia, tarsi yellowish to fulvous, remainder dark brown; gaster dark brown, gastral sterna IV – VI bright yellow largely; setae on clypeal margin and mandible sparse, golden and long.
Head. Mandible tridentate apically, median tooth large. Labrum with two distinct triangular teeth apically (Fig. 2 A). Clypeus smooth, shiny, flat; free margin of clypeus slightly produced and with two triangular teeth medially, slightly reflected, area between two teeth with shallow emargination (Fig. 2 A). Scapal hollow shiny, shallow, and broad, not clearly defined, provided with one vestigial minute tubercle medially; frontal furrow vestigial; median and upper frons shiny, with sparse, tiny punctures (Fig. 2 A). Ocellar triangle area flat, shiny, impunctate, area near eyes with dense, short, impressed lines, opaque area smaller than hind ocellus (Fig. 2 B). Vertex shiny, with sparse, tiny punctures (Fig. 2 B). Gena shiny, impunctate. Head from above with temples rarely convergent posteriorly, subquadrate (Fig. 2 B). Occipital carina incomplete, not ending to midventral line, suddenly ended at posterior ridge of stomal hollow, not dentate, occipital carina much narrowed, not crenulate. Inner and outer orbital furrows lacking (Fig. 2 A).
Mesosoma. Pronotal collar with strong, transverse carina anteriorly, and with incomplete lateral rugae, only distinct in posterior area, without antero-lateral corner (Fig. 2 C). Scutum moderately matt, with sparse, tiny punctures; admedian line distinctly impressed, extending to 2 / 5 scutum length; notaulus deeply grooved and crenulate, reaching quarter of scutum length; parapsidal line weakly impressed (Fig. 2 C). Scutellum shiny, with sparse, fine punctures, and median longitudinal line weakly impressed (Fig. 2 C). Metanotum weakly coriaceous (Fig. 2 C). Mesopleuron smooth and shiny, posterior area smooth without rugae, episcrobal area with dense, slender, longitudinal rugae posteriorly; scrobal suture, omaulus and hypersternaulus broadened, slightly crenate, scrobal suture complete (Fig. 2 D). Propodeal enclosure triangular medially, and with three sturdy, longitudinal rugae and sparse, irregular, transvers rugae, lateral area with irregular, short rugae; posterior surface of propodeum with sturdy reticulation, and without conspicuous median groove (Fig. 2 E); lateral surface of propodeum smooth and shiny anteriorly and medially, and with irregular reticulation posteriorly (Fig. 2 D).
Legs. Outer surface of hind tibia with three long, slender, fulvous to dark brown spines.
Wings. Forewing venation typical for genus Stigmus, hindwing media diverging before cu-a.
Metasoma. Dorsal surface of petiole subquadrate, gently convex and widened toward apex slightly, and with two sturdy oblique, longitudinal carinae forming V-shaped medially, area between V-shaped carinae with irregular rugae, medial and posterior areas with a few sturdy, longitudinal rugae on each side (Fig. 2 F); lateral surface of petiole with several strong, longitudinal rugae medially and posteriorly (Fig. 7 C); ventral surface of petiole with four strong, short, longitudinal rugae posteriorly. Gastral terga shiny, impunctate, gastral sternum VI moderately matt, and with dense fine punctures (Fig. 2 G). Pygidial area smooth and shiny, broadly triangular (Fig. 2 G).
Male. Almost same as female except mandible fulvous basally and medially; fore and mid legs yellowish to fulvous; hind femur dark brown largely, remainder yellowish; mandible bidentate apically; clypeus moderately convex, clypeal margin broadly produced, and nearly truncate medially (Fig. 2 H); head from above with temples gradually convergent posteriorly (Fig. 2 I); occipital carina narrowed, distinctly crenulate dorsally, and ventral area somewhat broadened, coarsely crenate (Fig. 2 I); flagellomeres without tyloids, setae normal (Fig. 2 I).
Distribution.
China (Shaanxi).
Etymology.
The name, clypeglabratus, is derived from the Latin clype - (= clypeus) and the Latin word glabratus (= smooth), referring to the smooth and impunctate clypeus.
description: Published as part of Li, Jinghong, Li, Qiang & Ma, Li, 2024, Five new species of the genus Stigmus Panzer (Hymenoptera, Crabronidae) from China, with a key to all Chinese species, pp. 313-336 in ZooKeys 1204 on pages 313-336, DOI: 10.3897/zookeys.1204.123831