CLADOENDESIS OF EPHEMEROPTERA
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Figure 88. Caenis/f5=g3, larvae.

A–H – Caenis/f6=g4: A–F – macrura [Caenis]: A – mature male larva, dorsal view (right gill operculum removed); B – larval exuviae of right half of pronotum and mesonotum; C – right gill operculum (tergalius II), ventral view; D – ventral side and distal margin of gill operculum; E – abdominal sternum IX of male larva, ventral view; F – transverse section on level of abdominal segment III; G – horaria [Ephemera], microtrichiae on ventral side of gill operculum; H – lactea [Oxycypha], abdominal sternum IX of male larva, ventral view. I–K – Clypeocaenis/fg1: I – Clypeocaenis/g3 oligosetosa [Clypeocaenis], larval head, lateral view (mouthparts removed); J–K – Amercaenis/g* ridens [Caenis], left gill operculum (tergalius II): G – dorsal view; H – cross section. (A, C–E, G–H – from Kluge 1997d; B – from Kluge 1997b).

Abbreviations: cly – clypeus; co – collar; fr – frons; lbr – labrum; mt – microtrichia; terII, terIII – tergalii II and III.