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The   Megalyridae   are a small family of parasitoid wasps comprising eight extant genera (71 species) and six extinct genera (13 species). Here, we report eight new species from Late Cretaceous Kachin (Myanmar) and Taimyr (Russia) ambers; the family is recorded for the first time from the latter. †   Cretolyra   noijebumensis    gen. et  sp . nov. , †   Cretolyra   shawi    gen. et  sp . nov. , †   Genkyhag   innebula    gen. et  sp . nov. , †   Megacoxa   chandrahrasa    gen. et  sp . nov. , †   Megacoxa   janzeni    gen. et  sp . nov. , and †   Megacoxa   synchrotron    gen. et  sp . nov. , are described from late Albian – early Cenomanian Kachin amber; †   Kamyristi   exfrigore    gen. et  sp . nov.  and †   Kamyristi   yantardakhensis    gen. et  sp . nov.  from Taimyr amber (Baikura, late Albian – early Cenomanian Ognevka Formation and Yantardakh, Santonian Kheta Formation, respectively). Phylogenetic analyses of the family are presented and the classification of the   Megalyridae   is revised accordingly. A new tribe, †  Megalavini   trib. nov. , is erected to accommodate †   Cretolyra    gen. nov. , †   Genkyhag    gen. nov. , †   Megacoxa    gen. nov.  together with †   Megalava    Perrichot, 2009; †  Megalavini   trib. nov.  is characterized by the vein M fully pigmented and veins Rs+M and M+Cu aligned, the crenulate mesometapectal sulcus, and the pronotal spiracle not posteriorly surrounded by cuticle. This spiracular condition was previously only observed in †   Megazar    Perrichot, 2009, thus the subfamily †  Megazarinae   Perrichot, 2009  stat. nov.  is proposed for the clade (†  Megalavini   + †   Megazar   ), as sister to the remaining   Megalyridae  . The latter is defined as the   Megalyrinae  , with †   Kamyristi    gen. nov.  being retrieved as sister to all other genera except    Rigel    Shaw, 1987 under parsimony analyses. To align phylogeny with classification, three new tribes are erected (†  Kamyristini   trib. nov. , †  Megallicini   trib. nov. , and †  Valaaini   trib. nov .) and the †  Cretodinapsini   is synonymized under   Megalyrini  . A grouping [   Rigel    +    Megalyridia   ] is supported under Bayesian analyses, which is the only specific conflict with the parsimony analyses, suggesting some degree of caution with respect to the internal relationships of the   Megalyrinae  . Finally, a revised key to the   Megalyridae   genera is provided.

arthropod systematics andamp; phylogeny

Unveiling ancient diversity of long-tailed wasps (  Hymenoptera  :   Megalyridae  ): new taxa from Cretaceous Kachin and Taimyr ambers and their phylogenetic affinities