A new mid-Cretaceous fossil genus of stonefly (Plecoptera: Perlidae) from the Burmese amber

Abstract

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Estimating the Drivers of Diversification of Stoneflies Through Time and the Limits of Their Fossil Record

“…4). However, several land masses such as India, Africa or Burmese Block lack evidence for a colonization by Antarctoperlaria at that time (e.g., Jouault et al 2022). This is rather surprising given that the biome homogeneity in central Gondwana could have facilitated wide dispersion between South America and Africa during the Early Cretaceous (Jouault et al 2021b, Nel andJouault 2021) and by extension up to the Burma Terrane (Jouault et al 2021c).…”

The larval morphology of a new mid-Cretaceous stonefly and its systematic position in Plecoptera

“…During the selection of taxonomic groups, the fossil impressions were excluded from the dataset because their outlines of bodies or fragmentary wings could not provide enough information for the phylogenetic analysis. Extinct taxa were restricted to the better-preserved Cretaceous stoneflies in Kachin amber, excluding the poorly described Pinguisoperla Chen, 2018 and the very likely synonym Burmaperla Jouault & Nel, 2022 of Largusoperla Du, 2018 (Jouault andNel 2022). Another 24 extant genera of Arctoperlaria were also included in the analysis.…”

“…Apart from Electroneuria, all other stoneflies in Kachin amber were described based on adult morphology. Among these, all the male specimens of Perlidae were exclusively and certainly attributed to the subfamily Acroneuriinae Klapálek, 1914 by the presence of hammer on abdominal sternum 9, absence of projected hemiterga, and absence of hair brush on mesal areas of abdominal sterna (Sivec et al 1988;Zwick 2000;Sroka et al 2018;Chen 2019aChen , 2019bChen , 2020aChen , 2022cChen and Xu 2021;Jouault et al 2022). Starkoperla Chen & Wang, 2020 is a perlid genus erected based on female morphology, which exhibits much longer and anteriorly located paraglossae than glossae, and the apomorphic elongation of the neck and cercal segments that can easily distinguish it from Kachinoperla (Chen and Wang 2020).…”