Tenth (the last) abdominal segment and bases of caudalii of mayfly larva.
A – Scheme. B–F – Tenth
abdominal segment of larva of Siphlonurus aestivalis (intestine and all muscles connecting intestine with body wall are removed):
B – dorsal view (hidden sclerites shown by interrupted lines and dotted, muscles shown by interrupted lines, their dorsal bases – by dotted polygons);
C – posterior view (cerci and paracercus removed, instead them three round sections are shown);
D – anterior view, from inside (left dorsal muscle removed); E – lateral view (muscles shown by interrupted
lines); F – longitudinal section.
Abbreviations: an – anal opening; c – cercus; bb.c
– basi-basal muscle of cercus; bb.pc – basi-basal muscle of paracercus;
d – dorsal longitudinal muscle; dv – dorsoventral
muscle; ep – epiproct; pc – paracercus; pp – paraproct;
tX – tenth abdominal tergite; tc – tricaudale.