CLADOENDESIS OF EPHEMEROPTERA
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Figure 6. Right half of imaginal mesonotum and forewing base of Siphlonurus/fg4 aestivalis [Siphlurus], smoothed on slide (membrane between axillary sclerites broken, the break shown by black) (from Kluge 1994a).

Abbreviations: ALPs – antelateroparapsidal suture; ALSc – anterolateral scutal costa; ALSs – anterolateral scutal suture; ANi – anteronotal transverse impression; ANp – anteronotal protuberance; APM – middle articulatory process of wing base; APP – posterior articulatory process of wing base; AxA – anterior axillary sclerite; AxC – axillary cord; AxM – middle axillary sclerite; AxP – posterior axillary sclerite; AxPr – proximal axillary sclerite; BA – basalare; BAn – basanale; BSc – basisubcostale; BR – basiradiale; cb – costal brace; HP – humeral plate; ISL – infrascutellum; LPN – lateropostnotum; LPs – lateroparapsidal suture; LS – lateroscutum; LSs – lateral scutal suture; MLs – median longitudinal suture; MNs – mesonotal suture; MS – medioscutum; MPs – medioparapsidal suture (notaulix); PAB:DA – dorsal arc of prealar bridge; PAB:PA – posterior arc of prealar bridge; PhA – anterior phragma; PLS – prelateroscutum; PSL – parascutellum; PSLccv – parascutellar lateral concavity; PSLcvx – parascutellar lateral convexity; PSp – posterior scutal protuberance; RSSLs – recurrent scuto-scutellar suture; SL – scutellum; SLS – sublateroscutum; SMS – submedioscutum; S.PSLs – scuto-parascutellar suture; SrA – suralare; S.SLi – scuto-scutellar impression; Teg – tegula.