Abstract
Billoperla starki gen. et sp. nov., a new extinct stonefly genus and species is described based on a well-preserved male adult in mid-Cretaceous Burmese amber and assigned to the subfamily Acroneuriinae of Perlidae. Its sternum 9 with a triangular hammer, and its epiproct is large, well-developed and upcurved, being distinctive for both the extant and extinct Perlidae. The new fossil genus is diagnostic mainly by the RA vein almost reaching wing apex, tergum 10 unmodified, paraprocts reduced, hammer present, and by the large and apically modified epiproct.
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