Xyelocerus abruptus Sun, Rasnitsyn, Zhuang & Shih 2024, sp. nov.
Creators: name: Sun, Chenhui
name: Rasnitsyn, Alexandr P.
name: Wedmann, Sonja
name: Zhuang, Jialiang
name: Shih, Chungkun
name: Ren, Dong
name: Gao
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Xyelotomidae
Xyelocerus
Xyelocerus abruptus

description: Xyelocerus abruptus Sun, Rasnitsyn, Zhuang & Shih, sp. nov.
(Fig. 1)
http://zoobank.org/ urn:lsid:zoobank.org:act: 4F22E9A3- FA40-459D-A8EE-A21B31CEE004
Diagnosis: Forewing with pterostigma sclerotized. Vein Sc present* forming kink to R and touching it in a point at level of 1-M base* or preserving dot-like short Sc 2 * and with Sc 1 oblique crossvein-like. 1-M bent before 1-Rs* five times as long as 1-Rs. Rs+M* 1m-cu* and 2-Cu of subequal length.
Etymology: The species name is derived from the Latin word ‘abruptus’* meaning suddenly steep* referring to the kink of Sc before touching R.
Material: Holotype * CNU-HYM-NN2022311. Paratypes: CNU-HYM-NN2022312; CNU-HYM-NN2022313; CNU-HYM-NN2022314; CNU-HYM-NN2022315 (poorly preserved* sex unknown); CNU-HYM-NN2022316 (poorly preserved* sex unknown).
Locality and horizon: Latest Middle Jurassic (late Callovian)* Jiulongshan Formation; Daohugou Village * Wuhua Township* Ningcheng County * Chifeng City * Inner Mongolia * China.
Description (Fig. 1A–C): Holotype * CNU-HYM-NN2022311. Very incompletely preserved. Sex unknown. Body length 12.8 mm * with abdomen partly preserved.
Head: Temples convex* extending lateral beyond eyes. Antenna incompletely preserved.
Forewing: Left forewing length 11.4 mm as preserved. Pterostigma fully sclerotized. Sc forming kink and touching R in a point at level of 1-M base; Sc 1 oblique (Fig. 1C). Two adventitious ‘1-Rs’ present before true one in left forewing* forming two small cells. 1-M (1.88 mm) straight and ~6.2 times as long as 1-Rs (0.30 mm). Vein M+Cu slightly bent. Crossvein 1r-rs shorter than 2-RS. Cell 1r small* 1mcu large* Rs+M* 1m-cu and 2-Cu of subequal length.
Legs: Left hind tibia narrow* 5.3 mm long.
Paratype CNU-HYM-NN2022312 (Fig.1D, E)
Sex unknown. Very incompletely preserved* preserved similar to holotype.
Paratype CNU-HYM-NN2022313 (Fig. 1F, G)
Female. Generally similar to holotype. Head and thorax dorsally coarsely punctated. Adventitious ‘1-Rs’ present before true one in right forewing (Fig. 1G)* forming a small cell. Body length 19.9 mm * right forewing length 15.6 mm * ovipositor length 3.4 mm.
Paratype CNU-HYM-NN2022314 p/c
(part and counterpart) (Fig.1H, I)
Sex unknown. Body and wings very incompletely preserved. As preserved* similar to holotype. Adventitious ‘1-Rs’ present before true one in right forewing (Fig. 1I)* forming a small cell. Right forewing length 14.8 mm as preserved.
description: Published as part of Sun, Chenhui, Rasnitsyn, Alexandr P., Wedmann, Sonja, Zhuang, Jialiang, Shih, Chungkun, Ren, Dong & Gao, 2024, Revisions * new taxa * and venation transformations of the sawfly family Blasticotomidae sensu lato (Hymenoptera: ºenthredinoidea) highlight the evolution of the basal Hymenoptera, pp. 1-19 in Zoological Journal of the Linnean Society 202 (1) on page 3, DOI: 10.1093/zoolinnean/zlae113, http://zenodo.org/record/14542355