Archaeromma, Yoshimoto, 1975

Key to the species of the genus Archaeromma View in CoL

( Mymarommatidae )

1. Clava 3-segmented.................................................................................... 2

- Clava 4-segmented.................................................................................... 5

2. Forewing posterobasal marginal seta present................................................................ 3

- Forewing posterobasal marginal seta absent................................................................ 4

3. Pronotum reaching tegula; forewing marginal fringe with 42 long, erect setae.............................................................................. A. mandibulatum ( Kozlov & Rasnitsyn, 1979) (♀), Taimyr amber, Santonian

- Pronotum not reaching tegula; forewing marginal fringe with 55 long, erect setae............................................................................... A. carnifex Engel & Grimaldi, 2007 View in CoL (♂), New Jersey amber, Turonian

4. Pedicel shorter than scape; mesosoma narrower than head....................................................................................................... A. masneri ( Yoshimoto, 1975) View in CoL (♀), Canadian amber, Campanian

- Pedicel as long as scape; mesosoma broader than head...................................................................................................... A. gibsoni Engel & Grimaldi, 2007 View in CoL (♂), New Jersey amber, Turonian

5. Notauli present; petiole with second segment longer than first segment...................................................... A. trigonokephalion Cockx, McKellar, Tappert, Vavrek & Muehlenbachs, 2020 (♂), Canadian amber, Campanian

- Notauli absent; petiole with first segment longer or as long as second segment..................................... 6

6. Forewing posterobasal marginal seta present................................................................ 7

- Forewing posterobasal marginal seta absent............................................................... 11

7. Claval segments strongly compacted (sutures almost undistinguishable).......................................... 8

- Claval segments not strongly compacted (sutures distinguishable)............................................... 9

8. Lengths of funicular segments increase towards apex; mesosoma longer than gaster............................................................................... A. minutissimum ( Brues, 1937) (♀, ♂), Canadian amber, Campanian

- Lengths of funicular segments similar; mesosoma shorter than gaster in females................................................................................. A. nearcticum Yoshimoto, 1975 (♀, ♂), Canadian amber, Campanian

9. Mesoscutum without apparent sculpture; forewing marginal fringe with 31 long, erect setae.......................................................................... A. chisatoi Aiba & Inosa, 2024 (♀, ♂), Japanese amber, Coniacian

- Mesoscutum with evident sculpture; forewing marginal fringe with 36–38 long, erect setae.......................... 10

10. Mesoscutum with transverse, striate sculpture; forewing posterobasal marginal seta offset by a series of nine short, posterior setae...................... A. japonicum ( Fursov, Shirota, Nomiya & Yamagishi, 2002) View in CoL (♂), Japanese amber, Santonian

- Mesoscutum with reticulate sculpture; forewing posterobasal marginal seta offset by a series of four–five short, posterior setae...................................... A. senonicum ( Kozlov & Rasnitsyn, 1979) (♀), Taimyr amber, Santonian

11. Forewing marginal fringe with 42–43 long, erect setae; forewing without mid-sized posterior setae; mesotibiae and metatibiae without pseudospurs; metatibiae with four distinct setae forming a comb on posterior distal margin............................................. A. hispanicum Ortega-Blanco, Peñalver, Delclòs & Engel, 2011 View in CoL (♀, ♂), Spanish amber, Albian

- Forewing marginal fringe with 38 long, erect setae; forewing with four mid-sized posterior setae; mesotibiae with two pseudospurs and metatibiae with four pseudospurs; metatibiae without setae forming a comb on posterior distal margin............................................................ A. phoenicium sp. nov. (♀), Lebanese amber, Barremian