CLADOENDESIS OF EPHEMEROPTERA
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Figure 23. Acanthametropus/fg* nikolskyi [Acanthametropus].

A – tergalius VI (ventral lobe detached and spread); B – apex of left maxilla, dorsal view; C – labial palp; D – head and prothorax of male imago, lateral view; E – head and thorax of male imago, ventral view (nerve ganglions shown by interrupted lines); F – subimaginal exuviae of right half of meson; G – genitals of male imago, ventral view (gonoducts shown by dotted lines). (A–C, E, F – from Kluge & al. 1995; D – from Kluge & al. 1986)

Abbreviations: c.mx – maxillary canines; ds1, ds2 – first and second dentisetae.