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.