CLADOENDESIS OF EPHEMEROPTERA
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Figs 37–43. Anafroptilum orthostylus. 37 – part of exuviae of larval head with labrum, bases of antennae and frontal suture; 38–39 – incisor, kinetodontium and prostheca of left and right mandibles, view from base of mandible; 40 – paraproct; 41 – genitals of male imago (on the left half, gonovectal muscles and hidden part of penis shown by interrupted lines, gonostylar muscle not shown; at right half gonostylar muscle shown by interrupted lines; median styligeral muscle shown by interrupted lines, areas of anterior attachment of median paraproctal muscles shown by dotted lines); 42 – exuviae of gonostyli of subimago; 43 – larval protogonostyli and subimaginal gonostyli developing under larval cuticle (40, 42 – holotype). Abbreviations: gs1, gs2, gs3 – segments of gonostylus; in – incisor; kd – kinetodontoum; m.IX-X – areas of anterior attachment of median paraproctal muscles (i.e., muscles going from sternum IX to common base of paraprocts); prs – prostheca; usg, unistyliger.