CLADOENDESIS OF EPHEMEROPTERA
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Figure 4. Winged stages of Siphlonurus/fg4 aestivalis [Siphlurus].

A – male subimago, head and thorax, lateral view; B – male imago, the same; C – female imago, head, lateral view. (B, C – from Kluge 2000)

Abbreviations: BS – basisternum of mesothorax; fr – face fold (frons); FS – furcasternum of mesothorax; PCxsA – anterior paracoxal suture of mesothorax; PhM – middle phragma; pt – patella; ta – tarsus; ti – telotibia; to1 – stenothoracic tracheostium (first thoracic spiracle); to2 – cryptothoracic tracheostium (second thoracic spiracle).