TABLE 7 in The species diversity and phylogeny of the genus Siphlonurus Eaton, 1868 from China (Ephemeroptera: Siphlonuridae)

TABLE 7. Identification characteristics of male imago (Columns 6–10). CharacterInner margin of basal segment of forcepsLength of penis longer than or subequal to styligerDorsal elongation of penisDorsal sclerotized transverse band of penisShape of penisSpeciesS. chankaewith projectionsubequalcurved, with an enlarged base, and outer margin with about 3 small spines.without expansiontwo penis lobes distinctly separated, inner margin with small spines, and outer margin concaveS. davidiwithout projectionsubequalstraight and spineless, with a sclerotized outer marginwithout expansioneach penis lobe tip with a brown sclerotized plates, length of two penis lobes ca. 1.1x widthS. dongxiwith projectionlongerstraight, spineless, and entirely sclerotizedwithout expansioninner margin of each penis lobe with a brown groove, length of two penis lobes ca..1.2x widthS. immaniswith projectionsubequalslender and spinelesswithout expansiontwo penis lobes separated, inner margin of each penis lobe with spines basally, outer margin concave near the middleS. lacustriswith projectionsubequalshort, sharp and spinelessexpanded in the middleinner margin of each penis lobe with 5–6 long spines, outer margin with approximately four small spines, with a short and wide projectionS. orientaliswithout projectionsubequalstraight and spineless, with a sclerotized outer marginwithout expansioninner margin of each penis lobe with oblique brown sclerotized plates, upper half of penis lobe expanded, length of two penis lobes ca. 1.8x widthS. palaearcticuswith projectionsubequalwide and arched, with a few spines apically (approximately 2–3 spines)without expansioneach penis lobe sclerotized, apex densely covered with spines, an additional long and slender projection between dorsal elongation and each penis lobeS. polyspineuswith projectionlongershort, blunt and spinlessexpanded in the middleinner margin with approximately 12 small spines, outer margin with approximately 7 serrated small spines, each penis lobe with a slender and sharp projectionS. zhelochovtseviwith projectionsubequalarched and distinctly enlarged apically, outer margin with about 8 small spineswithout expansiontwo penis lobes distinctly sclerotized, inner margin of each penis lobe with 6–9 small spines, outer margin concave