Liberitoma compta 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
Protenthredinidae
Liberitoma
Liberitoma compta

description: Liberitoma compta Sun, Rasnitsyn, Zhuang & Shih sp. nov.
(Figs 4, 5)
http://zoobank.org/urn:lsid:zoobank.org:act:6E1D3226- 993D-4E53-9672-53DEB11C4A8C
Diagnosis: Antenna with thread at least one-third of first flagellomere* with five preserved segments* each with length to width ratio ~2:1. Forewing with Sc basal branch short* vertical* meeting R prior to 1-M base; Sc 2 short* slightly proclined* merging into R at level of 1-M base; Sc 1 proclined and short (about as long as Sc 2).
Etymology: The species name is derived from the Latin word ‘comptus’* meaning ornamented* adorned* referring to this sawfly being preserved in good condition.
Material: Holotype * CNU-HYM-NN2022302. Paratypes: CNU-HYM-NN2022303; CNU-HYM-NN2022304; CNU-HYM-NN2022305; CNU-HYM-NN2022306.
Locality and horizon: Latest Middle Jurassic (late Callovian)* Jiulongshan Formation; Daohugou Village * Wuhua Township* Ningcheng County * Chifeng City * Inner Mongolia * China.
Description: Holotype* CNU-HYM-NN2022302 (Fig. 4). Male. Body length 13.4 mm as preserved (excluding antennae). Surface coarsely punctated* especially on head* thorax* and the first abdominal segments (Fig. 4A * B).
Head: Short* ovate* with eyes not small* roundish* apparently bulging* placed near the fore margin of head. Mandibles with two teeth visible.
Antenna: First flagellomere (2.1 mm) shorter than width of head (2.8 mm)* and about three times as long as thread. Thread with five segments preserved* thicker than those of type species* length (in millimetres) of each flagellomere: 0.16* 0.15* 0.15* and 0.13 (the last flagellomere was not measured owing to partial preservation)* length to width ratio ~2:1 (Fig. 4C).
Forewing: Sc with basal branch short* vertical; Sc 2 short* slightly proclining; Sc 1 short* oblique* basal branch meeting R well basal to 1-M base; Sc 2 merging into R basal to 1-Rs for more than 1-Rs length; Sc 1 curved* about as long as Sc 2 (Fig. 4D). Pterostigma fully sclerotized. Vein M+Cu slightly bent; 1-M (0.9 mm) obviously curved* about three times as long as 1-Rs (0.3 mm). Crossvein 2r-rs (0.8 mm) roughly two times as long as 1r-rs (0.3 mm)* oblique and intersecting with pterostigma near its apex; 2r-m connecting with cell 2r almost at the end of the cell* and distinctly bent towards apex of wing at middle. Cell 1r large; 2r and 2rm narrow and equal in lengths and widths.
Hind wing: Sc two-branched* forking far from apex of costal space* with hind branch very short and fore one longer* oblique (Fig. 4E). Basal hamuli visible in left hind wing.
Legs: Long and narrow* fore tibia 3.0 mm long* tarsus relatively shorter than that in type species* tarsus with two segments present; tarsomere I (1.42 mm) longer than tarsomere II (0.83 mm)* claw strongly bent. Middle tibia 3.4 mm long* with two apical spurs visible.
Abdomen: Male genitalia apparently not reverted* with gonocoxa and gonostylus massive* gonostylus apparently with gonomacula* volsella with stick-like digitus* cuspis and penis valves not distinct.
Remarks: Gonomacula has not been recorded in other Tenthredinoidea yet including extant Blasticotomidae.
Paratype CNU-HYM-NN2022303 (Fig.5A, B)
Sex unknown. Generally similar to the holotype as preserved. Antenna well preserved and complete. First flagellomere (1.9 mm) obviously shorter than width of head (2.6 mm)* approximately two times as long as thread* and a total of seven thread segments preserved; length to width ratio of each flagellomere about two (Fig. 5A). Only left forewing partly preserved. Vein Sc three-branched* the first branch uniquely running into R very close to separation of 1-M from M+Cu; Sc 1 preserved incompletely; Sc 2 oblique* meeting R before origin of 1-Rs (Fig. 5B).
Paratype CNU-HYM-NN2022304 (Fig. 5C–E)
Sex unknown. Similar to the holotype. Mandibles incompletely preserved* thick and curved (Fig. 5D). Legs partly well preserved* all with vaguely visible numerous fine spines. Right foreleg: tibia (2.2 mm) with two apical spurs present* almost equal in length; tarsus with four segments present* tarsomere I longer than tarsomeres II and III combined; lengths of individual tarsomeres (in millimetres): 1.01* 0.43* 0.36* and 0.34. Right middle tibia length 2.8 mm * tarsomeres I and V longer than tarsomeres II* III* and IV combined; lengths of individual tarsomeres (in millimetres): 1.24* 0.49* 0.42* 0.27* and 0.55. Right hind tibia 4.4 mm long* with no spur preserved. Left hind tibia (4.2 mm) with two apical spurs preserved* one long and one short; tarsus with five tarsomeres and one tarsal claw preserved* tarsomere I approximately equal to tarsomeres II* III* and IV combined; lengths of individual tarsomeres (in millimetres): 1.24* 0.51* 0.40* 0.35* and 0.67. Body length 9.9 mm * forewing length 12.7 mm.
Paratype CNU-HYM-NN2022305 (Fig. 5F, G)
Female. Forewings both partly preserved. Vein Sc triple-branched* shaped like an inverted ‘Y’; the first branch intersecting with R before separation of 1-M from M+Cu; Sc 1 and Sc 2 both oblique in different directions; Sc 1 (0.28 mm) ~1.7 times as long as Sc 2 (0.16 mm)* merging into C a short distance before separation of 1-Rs from R; Sc 2 meeting R before origin of 1-Rs (Fig. 5G). M+Cu slightly bent; 1-M (1.1 mm) curved and about three times more than 1-Rs (0.3 mm). Crossvein 1r-rs obviously shorter than 1r-m; 2r-rs (1.3 mm) roughly three times as long as 1r-rs (0.4 mm)* oblique and intersecting with pterostigma near its apex. Cell 1r large; cell 2r and cell 2rm narrow. Body length 16.9 mm * right forewing length 13.3 mm * ovipositor length 3.0 mm.
Paratype CNU-HYM-NN2022306 (Fig.5H–J)
Male. Body length 16.5 mm (excluding antennae). Mandible paired preserved* bent like a sickle (Fig. 5I). Forewings partly preserved* Vein Sc with three branches (Fig. 5J)* the first branch merging into R before separation of 1-M from M+ Cu; Sc 1 (0.31 mm) short* ~1.9 times as long as Sc 2 (0.16 mm)* and inclining towards apex of the wing* merging into C before separation of 1- Rs from R; Sc 2 slightly oblique* meeting R before origin of 1- Rs. M + Cu slightly bent* 1-M (1.1 mm) arcuately* and approximately three times more than 1- Rs (0.3 mm). Cell 1r large; 1mcu long and lengthening to posterior margin. Male genitalia different from holotype * with gonocoxa longer* gonostylus shorter and much narrower. Body length 16.7 mm * right forewing length 10.3 mm * genitalia length 2.2 mm.
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 pages 7-10, DOI: 10.1093/zoolinnean/zlae113, http://zenodo.org/record/14542355