Aduantoma insolita Sun, Rasnitsyn, Zhuang & Shih, 2024

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, Zoological Journal of the Linnean Society 202 (1), pp. 1-19 : 12

Aduantoma insolita Sun, Rasnitsyn, Zhuang & Shih gen. et sp. nov.

( Fig. 8 ) http://zoobank.org/ urn:lsid:zoobank.org:act:0041EF57-E06D-4083-A47D-26F6EC9D8DD3

Diagnosis: As for genus (see above).

Etymology: The species name is derived from the Latin word ‘insolitus’* meaning unusual* rare* and referring to the posture of this sawfly preserved gracefully.

Material: Holotype * CNU-HYM-NN2022310 p/c (part and counterpart).

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-NN2022310 ( Fig. 8A–C ). Male. Body length (excluding antennae) 8.4 mm. Forewing nearly complete* head* thorax* and part of legs preserved.

Head: Transverse* somewhat narrowed forwards* with eyes occupying most of head sides* flat. Antennae not preserved.

Forewing: Length 6.5 mm as preserved. Pterostigma wide* sclerotized basally. Sc with stalk free (distant from R)* with kink to touch R at level of 1-M base* leaving Sc 1 as oblique crossvein intersecting with C behind level of 1-Rs ( Fig. 8D ). 1-Rs distinct* single. 1-M (0.48 mm) 3.4 times as long as 1-Rs (0.14 mm)* gently arching* shorter than 2-Cu. Cell 1r large; Rs+M more than twice as long as 2-M. M+Cu bent. Crossvein 2r-rs (0.5 mm) nearly equal to 1r-rs (0.4 mm)* oblique* and meeting with pterostigma only near its apex. 1m-cu longer than 2-Cu.

Leg: Left hind leg well preserved. Protibia 2.0 mm long* with no spurs visible; tarsomere I longer than tarsomeres II* III* and IV combined; tarsomere lengths (in millimetres): 0.76* 0.32* 0.26* and 0.16* respectively; last segment not fully preserved.

Abdomen: Male genitalia ( Fig. 8E ) with gonocoxa comparatively small* gonostylus long* penis long and wide.

Figures

Figure 8. Aduantoma insolita. Holotype* CNU-HYM-NN2022310 p/c (part and counterpart)* male. A* dorsal view.B* ventral view.C* line drawing.D* vein Sc in right forewing.E* male genitalia under alcohol.Scale bars: 2 mm in A–C; 0.5 mm in D* E.