CLADOENDESIS OF EPHEMEROPTERA
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Figure 56. Heptagenia/f7=g6.

A–D – Heptagenia/f8=g7 sulphurea [Ephemera], imaginal thoracic sterna: A–B – prosternum: A – ventral view, B – lateral view; C – imaginal mesothorax, ventral view; D – meso- and metathoracic nerve ganglia (shown by black) and ventral areas of mesothoracic muscles attachment (compare with Fig.57:A–B). E–G – Dacnogenia/g* coerulans [Heptagenia]: E – hypopharynx and left superlingua, ventral view; F – glossae and ventral margin of hypopharynx, apical view; G – glossae, dorsal view (in left half) and ventral view (in right half). H–O – Stenonema/g1: H–K – Maccaffertium/g* mexicana [Heptagenia]: H – hypopharynx and superlinguae, ventral view; I – glossae and ventral margin of hypopharynx, apical view; J – glossae, dorsal view (in left half) and ventral view (in right half); K – middle part of larval cercus; L – Stenonema/g* femorata [Baetis], imaginal mesonotum, dorsal view (bases of posterior scuto-coxal and scuto-lateropostnotal muscles shown by interrupted lines) (compare with Fig.63:D–E); M – Maccaffertium/g1 terminata [Palingenia], the same; N–O – Stenacron/g1 sp.: N – glossae, dorsal view (in left half) and ventral view (in right half); O – left tergalius II, ventral portion bent out (ribs dotted, tracheae shown by dotted lines). (A–D, F–G, I–O – from Kluge 1988a).

Abbreviations: AES – anepisternum; BS₁ – basisternum of prothorax; BS₂ – basisternum of mesothorax; FS₁ – furcasternum of prothorax; FSi – furcasternal median impression of mesothorax; FSp – furcasternal protuberance of mesothorax; LPs – lateroparapsidal suture; MNs – mesonotal suture; MPs – medioparapsidal suture; n.mst – mesothoracic nerve ganglion; n.mtt – metathoracic nerve ganglion; SA.Sm – ventral base of subalar-sternal muscle; S.CmP – dorsal base of posterior scuto-coxal muscle; S.ESm – ventral base of scuto-episternal muscle; S.LPNm – dorsal base of scuto-lateropostnotal muscle.