Blasticotomidae Andre 1881
Year: 2024
Type: other
Abstract: Key to genera of Blasticotomidae by forewing venation (excluding Zippelia engeli Rasnitsyn & Müller * 2023* known from a larva only) 1. Cu without distinct kink at fork M+Cu .....................................................................................................................................................2 - Cu with distinct kink at fork M+Cu......................................................................................................................................................... 16 2. 1-Cu straight; cell 1mcu scarcely or not at all widened distally and almost streamlined with wing axis* usually short (≤2:1). (Subfamily Blasticotominae Thomson * 1871) .........................................................................................................................................3 - 1-Cu distinctly bent; cell 1mcu usually distinctly widened apical* oriented oblique* usually long (>2:1). (Subfamily Undatominae subfam. nov.)................................................................................................................................................................... 10 3. 2-Rs lost* Sc lost* pterostigma wide* antennal thread (flagellum behind composite first segment) with one or no segments... ............................................................................................................................................................................................................................4 - 2-Rs present* Sc rarely lost* pterostigma variable* antennal thread with several segments..............................................................7 4. 2r-rs and 2m-cu on about one level. Cell 1mcu as long as cell 2mcu...................................................................................................5 - 2r-rs more basal than 2m-cu. Cell 1mcu distinctly shorter than cell 2mcu ........................................................................................6 5. Pterostigma particularly wide (0.9 as wide as cell 1mcu). Vein 2r-m about as long as vein 2r-rs .................................................... .................................................................................................................................................................................... Enspeletoma gen. nov. - Pterostigma less wide (0.7 as wide as cell 1mcu). Vein 2r-m shorter than vein 2r-r............................... Blasticotoma Klug * 1834 6. Cell 3r 1.3 times as long as cell 2r..................................................................................................................... Paremphytus Brues * 1908 - Cell 3r scarcely longer than cell 2r........................................................................................................................ Runaria Malaise * 1931 7. Pterostigma very wide (~2:1). Sc lost .......................................................................................................................................................... .................... Leridotoma Rasnitsyn & Ansorge* 2000 (including ‘ Undatoma’ rudgwickensis Rasnitsyn & Jarzembowski * 1998) - Pterostigma less wide (>2.5:1). Sc usually present .................................................................................................................................8 8. Sc complete except hind branch* with stalk touching R .............................................................. Abrotoma Gao * Ren & Shih* 2009 - Sc in two parts (stalk disconnected with crossvein-like Sc 1) or stalk lost ...........................................................................................9 9. Pterostigma wider (~3:1)* sclerotized. Cell 1mcu longer (2.5:1)......................................................... Xyelotoma Rasnitsyn * 1968 - Pterostigma narrower (4:1)* usually translucent centrally. Cell 1mcu shorter (<2:1) ...................................................................... ......................................................... Xyelocerus Rasnitsyn * 1968 (Xyelocerus abruptus Sun * Rasnitsyn* Zhuang & Shih sp. nov.) 10. R+M long* Sc crossvein-like* pterostigma narrow (3.5:1) ..................................................... Synaptotoma Gao * Ren & Shih* 2009 - 1-Rs present even if short (no R+M)* Sc not as crossvein only* pterostigma usually wider (≤3:1) ........................................... 11 11. Sc lost ................................................................................................................................................................. Undatoma Rasnitsyn * 1977 - Sc with at least stalk distinct ...................................................................................................................................................................... 12 12. Sc stalk ending on R (no distinct Sc 2) ..................................................................................................................................................... 13 - Sc forked apical into Sc 1 and Sc 2 ............................................................................................................................................................... 14 13. Sc 1 lost. Cell 1mcu shorter* with its upper side two times as long as 1m-cu......................................................................................... .................................................................................................................................................... Aethotoma Gao * Shih* Engel & Ren* 2016 - Sc 1 present. Cell 1mcu longer* with its upper side three times as long as 1m-cu............................................................................ 15 14. Sc 1 started at end of Sc stalk................................................................................................................................... Aduantoma gen. nov. - Sc 1 and apex of Sc stalk far distant............................................................................................................................ Apertoma gen. nov. 15. Sc with Sc 1 broken midway and with no adventitious basal hind branch ........................ Paradoxotoma Gao * Ren & Shih* 2009 - Sc complete and with adventitious basal hind branch ....................................................................................... Liberitoma gen. nov. 16. Cell 1mcu long (2.5:1)* scarcely or not at all widened distally and oriented less oblique with wing axis; Sc with stalk and fore branch complete; 1-Rs distinct. (Pseudoxyelocerinae subfam. nov.) ............................................................................................... ............................................................................................................................. Pseudoxyelocerus Nel * Petrulevicius & Henrotay* 2004 - Cell 1mcu short (≤2:1)* scarcely or not at all widened distally and oriented strongly oblique with wing axis (Dahurotomidae subfam. nov.) .............................................................................................................................................................................................. 17 17. 1-Rs distinct* Rs 2 present* Sc with stalk and both main branches complete .................................... Pseudoxyela Rasnitsyn * 1968 - 1-Rs and Rs 2 lost* Sc stalk* if present* disconnected from crossvein-like Sc 1 .................................. Dahurotoma Rasnitsyn * 1990
Authors: Sun, Chenhui, Rasnitsyn, Alexandr P., Wedmann, Sonja, Zhuang, Jialiang, Shih, Chungkun, Ren, Dong, Gao
Language: English
Topic: Fossil Insects in Amber
Domain: Life Sciences
Open Access status: green
OpenAlex ID: W6930620122
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