Stigmus carinannulatus Li & Ma, 2024

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, ZooKeys 1204, pp. 313-336 : 313-336

publication ID	https://doi.org/ 10.3897/zookeys.1204.123831
publication LSID	lsid:zoobank.org:pub:B1FBD39B-E01A-4B0C-AA01-36DC49A609A4
DOI	https://doi.org/10.5281/zenodo.11551319
persistent identifier	https://treatment.plazi.org/id/CBECB838-47C0-4C4F-AA4B-ED9E9681ECDC
taxon LSID	lsid:zoobank.org:act:CBECB838-47C0-4C4F-AA4B-ED9E9681ECDC
treatment provided by	ZooKeys by Pensoft
scientific name	Stigmus carinannulatus Li & Ma
status	sp. nov.

Treatment

Stigmus carinannulatus Li & Ma sp. nov.

Figs 1 A – N View Figure 1 , 7 A, B View Figure 7

Type material.

Holotype: China • ♀; Yunnan, Tengchong City ; 25 ° 1 ′ N, 92 ° 28 ′ E; 11. VIII. 2011; coll. Jujian Chen; sweep net ( YNAU) GoogleMaps . Paratypes: China • 20 ♂♂; Yunnan, Kunming City, Yunnan Agricultural University ; 25 ° 7 ′ N, 102 ° 44 ′ E; 12. IV. 2023 (5 ♂♂), 12. VI. 2023 (9 ♂♂), 19. VIII. 2023 (6 ♂♂); 1910 m elev.; coll. Jinghong Li; sweep net ( YNAU) GoogleMaps ; China • 1 ♂; Yunnan, Baoshan City, Longyang District, Lujiang Country, Pumanshao Village ; 24 ° 56 ′ N, 98 ° 47 ′ E; 21. VII. 2006; 1951 m elev.; coll. Zhongshi Zhou; sweep net ( YNAU) GoogleMaps .

Diagnosis.

The new species can be easily separated from the similar species S. denticorneus Bashir & Ma, 2019 by the following characters: hindwing media diverging before cu-a; occipital carina complete, ending to midventral line; anterior area of pronotal collar with complete, transverse carina; scutum with several, large punctures, anterior area with distinct, longitudinal striations, posterior area with dense, fine, short, longitudinal rugae; posterior area of mesopleuron with sparse, short, longitudinal rugae, episcrobal area smooth, without striation. Stigmus denticorneus has the following characters: hindwing media diverging beyond cu-a; occipital carina incomplete, not ending to midventral line, suddenly ended at posterior ridge of stomal hollow; anterior area of pronotal collar with incomplete, transverse carina, narrowly emarginated in middle; anterior area of scutum with dense, large punctures, remainder with sparse, midsize to large punctures; posterior area of mesopleuron smooth, without rugae, episcrobal area with dense, longitudinal striations.

Description.

Female. Measurements. ♀, BL: 4.6 mm; HW: HLD: HLF = 78: 54: 59; HW: EWd: EW: TW: EL = 78: 23: 22: 28: 51; POD: OOD: OCD = 8: 14: 15; length of scape: length of pedicel: length of flagellomere I: width of flagellomere I: length of flagellomere II: width of flagellomere II = 21: 9: 8: 5: 8: 5; PL: PW: LTI: WTI: HFL: HTL = 36: 11: 40: 46: 48: 55. ♂, BL: 3.5–4.6 mm; HW: HLD: HLF = 53: 31: 42; HW: EWd: EW: TW: EL = 53: 15: 20: 12: 36; POD: OOD: OCD = 5.5: 10: 11; length of scape: length of pedicel: length of flagellomere I: width of flagellomere I: length of flagellomere II: width of flagellomere II = 13: 5: 5: 3: 5: 3; PL: PW: LTI: WTI: HFL: HTL = 24: 5: 25: 26: 33: 57.

Color pattern. Body black; clypeus with reddish brown to dark brown band subapically; mandible fulvous except reddish brown apically; labrum dark brown; palpi, scape, pedicel, tegula and pronotal lobe fulvous; flagellomeres I – V beneath fulvous, above brown, remainder dark brown; forewing veins brown; fore and mid legs: fulvous except coxa largely and femur medially dark brown; hind leg: trochanter, basal 1 / 4 of tibia and tarsus fulvous, remainder dark brown; gastral sterna IV-VI fulvous to dark brown; setae on clypeus and mandible sparse and golden.

Head. Mandible tridentate apically, median tooth large (Fig. 1 A View Figure 1 ). Labrum with two distinct cornuted teeth apically. Clypeus shiny, nearly flat, with sparse, midsize punctures; free margin of clypeus slightly produced and with two distinct triangular teeth medially, slightly reflected, area between two teeth deeply emarginated (Fig. 1 A View Figure 1 ). Scapal hollow moderately matt, coriaceous, somewhat shallow and defined, provided with one vestigial minute tubercle medially, not spined (Fig. 1 A View Figure 1 ). Frontal furrow very fine and weakly impressed, inconspicuously (Fig. 1 A View Figure 1 ). Median and upper frons shiny, with sparse, fine punctures, gently convex (Fig. 1 A View Figure 1 ). Ocellar triangle area flat, shiny, impunctate, area near eyes with dense, short, impressed lines, opaque area smaller than hind ocellus (Fig. 1 B View Figure 1 ). Vertex shiny, impunctate (Fig. 1 B View Figure 1 ). Gena shiny, smooth and impunctate (Fig. 1 C View Figure 1 ). Head from above with temples rarely convergent posteriorly, subquadrate (Fig. 1 B View Figure 1 ). Occipital carina complete, ending to midventral line, dorsal area much narrowed, not crenulate, ventral area gently broadened, coarsely crenate (Fig. 1 C View Figure 1 ); inner and outer orbital furrows lacking (Fig. 1 A View Figure 1 ).

Mesosoma. Pronotal collar with strong, transverse carina anteriorly, and with incomplete lateral rugae, only distinct in posterior area, without antero-lateral corner (Fig. 1 D View Figure 1 ). Scutum moderately matt, with several large punctures, anterior area with dense, conspicuous, longitudinal striations, posterior area with dense, fine, short, longitudinal rugae (Fig. 1 D View Figure 1 ); admedian line weakly impressed, extending to 1 / 2 of scutum length; notaulus deeply grooved and crenulate, reaching 2 / 5 of scutum length; parapsidal line distinct (Fig. 1 D View Figure 1 ). Scutellum shiny, with sparse, fine punctures, without medial longitudinal line (Fig. 1 D View Figure 1 ). Metanotum weakly coriaceous (Fig. 1 D View Figure 1 ). Mesopleuron shiny, posterior area with several slender, short, longitudinal rugae, episcrobal area shiny and smooth (Fig. 1 E View Figure 1 ); omaulus and hypersternaulus broadened, distinctly crenate, scrobal suture complete and inconspicuous, just with single longitudinal rugae (Fig. 1 E View Figure 1 ). Propodeal enclosure triangular medially, with three sturdy longitudinal median rugae, and several transvers rugae, with sparse sturdy, oblique, longitudinal rugae laterally (Fig. 1 F View Figure 1 ); posterior surface of propodeum with sparse irregular rugae, without conspicuous median groove (Fig. 1 F View Figure 1 ); lateral surface of propodeum with dense, oblique, longitudinal rugae anteriorly and medially, and irregular reticulation posteriorly (Fig. 1 E View Figure 1 ).

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, moderately convex and widened toward apex slightly, and with two sturdy, longitudinal, median carinae, area between carinae with dense, fine, irregular rugae, median and posterior areas with two sturdy, longitudinal, lateral rugae on each side (Fig. 1 G View Figure 1 ). Lateral surface of petiole with three strong, longitudinal rugae medially and posteriorly (Fig. 7 A View Figure 7 ). Ventral surface of petiole with a few strong, short, longitudinal rugae posteriorly. Gastral terga shiny, impunctate, gastral sternum VI with sparse, fine punctures apically (Fig. 1 H View Figure 1 ). Pygidial area moderately matt, broadly triangular, apex truncate, with longitudinal micro-striations (Fig. 1 H View Figure 1 ).

Male. Same as female except tegula dark brown; setae on clypeus dense, silvery, short (Fig. 1 I View Figure 1 ); mandible bidentate apically (Fig. 1 I View Figure 1 ); free margin of clypeus slightly produced, nearly truncate medially, and with shallow emargination (Fig. 1 I View Figure 1 ); head from above with temples somewhat roundly convergent posteriorly; dorsal area of occipital carina much narrowed, coarsely crenulate, and ventral area somewhat broadened, distinctly crenate (Fig. 1 J View Figure 1 ); flagellomeres without tyloids, setae normal; gastral sterna impunctate (Fig. 1 J View Figure 1 ).

Distribution.

China (Yunnan).

Etymology.

The name, carinannulatus, is derived from the Latin carin - (= carina) and the Latin word annulatus (= annular), referring to the complete occipital carina.