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Tenth (the last) abdominal segment and bases of caudalii of mayfly larva.

A Scheme. BF 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.