CLADOENDESIS OF EPHEMEROPTERA
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Figure 18. Siphlonurus/fg4.

A–E – Siphlonurus/fg4 aestivalis [Siphlurus]. A–C – Copulatory apparatus of female imago: A – abdominal segments VII–X, lateral view; B – boundary of sterna VII and VIII with copulatory pouch, median section; C – copulatory pouch, dorsal view (in left half) and ventral view (in right half). D – Apex of abdomen of mature male larva, ventral view. E – subimaginal exuviae of right half of mesonotum; F – Siphlonurus/fg4 palaearcticus [Oniscigaster]: tergalius III. (A – from Kluge 2000; B, C, E, F – from Kluge & al. 1995)

Abbreviations: a.r – anal rib; c – cercus; cp - copulatory pouch; c.r – costal rib; gp – gonopore; gsty – gonostylus; LPs – lateroparapsidal suture; LS – lateroscutum; MNs – mesonotal suture; MPs – medioparapsidal suture (notaulix); MS – medioscutum; p – penis; pc – paracercus; pp – paraproct; rs – receptaculum seminis; sVII, sVIII, sIX – abdominal sternites VII, VIII and IX; SLS – sublateroscutum; SMS – submedioscutum; SrA – suralare; tX – abdominal tergite X.