CLADOENDESIS OF EPHEMEROPTERA
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Fig. 101–107. Petersula heptagenoides. 101 – labrum in longitudinal section; 102 – anterior margin of labrum, focus on dorsal side; 103 – the same, focus on ventral side; 104 – proximal-lateral margin of labrum; 105 – cuticle of head of male larva; 106 – labrum with hypoderm and muscles; 107 – its muscle-depressor enlarged. Abbreviations: a.m – initial anterior margin; anter.r – anterior transverse setal row; cly – clypeus; c.md.a and c.md.p – anterior and posterior mandibular condyles visible on ventral side of head through cuticle; depr – muscle-depressor; in – incision laterad of posterior mandibular condyle; in-a and in-p – convexities anteriad and posteriad of incision; poster.r – posterior transverse setal row; v.s – ventral setae; v-a.s – ventro-anterior strip of setae.