Baissidae, Rasnitsyn, 1975

Álvarez-Parra, Sergio & Huang, Di-Ying, 2024, A new species of Manlaya (Hymenoptera: Baissidae) from the Lower Cretaceous Shouchang Formation, Eastern China, Zootaxa 5562 (1), pp. 56-64 : 61-62

Key to the species of the family Baissidae from China

The record of Baissidae from China is represented by one species of Heterobaissa , five species of Humiryssus , five species of Manlaya , and two species of Mesepipolaea , collected from Yixian Formation ( Hebei and Liaoning provinces), Laiyang Formation ( Shandong Province), Laocun Formation, and Shouchang Formation (both in Zhejiang Province), spanning from the Barremian to the Aptian in the Early Cretaceous ( Lin 1980; Hong & Wang 1990; Ren et al. 1995; Zhang & Rasnitsyn 2004; Li et al. 2018, 2019; Zhang 2021). A key to the species of Baissidae found in China is presented below. Couplets 2 and 3 are modified from those of Zhang & Rasnitsyn (2004). The venation terminology refers to the forewing.

1. Distalmost abscissa of Rs slightly curved and not directed towards wing apex..................................... 2

- Distalmost abscissa of Rs mostly straight and directed nearly towards wing apex................................... 6

2. Crossvein r-rs nearly as long as pterostigma width........................................................... 3

- Crossvein r-rs shorter than pterostigma width............................................................... 4

3. Pterostigma triangular; cell 3r 1.7× as long as wide; first abscissae of Rs and M meeting at angle; metasoma paler before midlength...................................................... Humiryssus specialis Zhang & Rasnitsyn, 2004

- Pterostigma not triangular; cell 3r about twice as long as wide; first abscissae of Rs and M forming smooth line; metasoma uniformly dark.................................................. Humiryssus laiyangensis ( Hong & Wang 1990)

4. Crossvein r-rs sub-vertical; 2Rs+M present; crossveins 2r-m and 3r-m present as stubs on Rs and M..................................................................................... Humiryssus leucus Lin, 1980 ( Zhang 2021)

- Crossvein r-rs sub-vertical; 2Rs+M absent; crossvein 3r-m present as a stub only on Rs.............................. 5

5. Metanotum and propodeum irregularly and coarsely reticulate; 1Rs and 1M streamlined; vein 1M about as long as 1m-cu............................................................... Humiryssus cancellatus Zhang & Rasnitsyn, 2004

- Metanotum and propodeum not reticulate; 1Rs and 1M forming a line; 1M longer than 1m-cu....................................................................................... Humiryssus vulgatus Zhang & Rasnitsyn, 2004

6. Propleura forming a neck; metasoma conical; ovipositor not exerted....... Heterobaissa apetiola Li, Rasnitsyn & Ren, 2018

- Propleura not forming a neck; metasoma ovoid; ovipositor exerted.............................................. 7

7. Costal cell broad; vein 1Rs originating near pterostigma base; metasoma as long as or shorter than mesosoma............ 8

- Costal cell much narrower than pterostigma; vein 1Rs originating far from pterostigma base; metasoma longer than mesosoma........................................................................................... 9

8. Crossvein 1cu-a interstitial to 1M; metasoma not petiolate....... Mesepipolaea nanligezhuangica Zhang & Rasnitsyn, 2004

- Crossvein 1cu-a distinctly postfurcal to 1M; metasoma petiolate............ Mesepipolaea parva Li, Shih, Li & Ren, 2019

9. Cell 2mcu not elbowed; crossvein 1cu-a interstitial to 1M.................................................... 10

- Cell 2mcu elbowed; crossvein 1cu-a slightly postfurcal to 1M................................................. 12

10. Cell 1mcu not parallel-sided; distal section of 2M sigmoidal.................... Manlaya flexuosa Ren, Lu & Guo, 1995

- Cell 1mcu strongly transverse and parallel-sided; distal section of 2M slightly geniculate at level that 2r-m should be present... .................................................................................................. 11

11. Pterostigma triangular; crossvein r-rs strongly inclivous; 1Rs longer than 1M; 3r-m present as a short stub on M.............................................................................. Manlaya proba Li, Shih, Li & Ren, 2019

- Pterostigma semi-circular; crossvein r-rs slightly inclivous; 1Rs shorter than 1M; 3r-m absent............................................................................................. Manlaya ultima Li, Shih, Li & Ren, 2019

12. Pterostigma triangular; crossvein r-rs less than half length pterostigma width; 1Rs about twice longer than 1M............................................................................... Manlaya magna Li, Shih, Li & Ren, 2019

- Pterostigma not triangular; crossvein r-rs half longer than pterostigma width; 1Rs slightly longer than 1M................................................................................................ Manlaya minima sp. nov.