CLADOENDESIS OF EPHEMEROPTERA
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Figure 12. Larval 10th abdominal segment. [A-C]

A–E – Siphlonurus/fg4 aestivalis [Siphlurus] (intestine and all muscles connecting intestine with body wall are removed): A – posterior view (cerci and paracercus removed, instead them three round sections are shown); B – anterior view, from inside; C – dorsal view (hidden sclerites shown by interrupted lines and dotted, muscles shown by interrupted lines, their dorsal bases – by dotted polygons); D – longitudinal section; E – lateral view (muscles shown by interrupted lines). F – scheme of structure usual for Ephemeroptera (corresponds to A–E); G – scheme of sctructutru peculiar for Geminovenata, Fossoriae and Caenotergaliae.

Abbreviations: btc – basitricaudale; c – cercus; c:B-B – basi-basal muscle of cercus; ctr – cercotractor; pc – paracercus; pc:B-B – basi-basal muscle of paracercus; pp – paraproct; tX – abdominal tergite X.