TABLE 4. Identification characteristics of nymphs (Columns 1–8). CharacterBody length/mmWingpadsLength ratio of maxillary palp segment I and galea-laciniaInner margin of maxillary palp segment IILength ratio of posterolateral spine of tergum IX and tergum IXPosterior margin of abdominal sternum IXDorsal surface of tergum XLateral margins of tergum XSpeciesS. chankae13.0–15.0without spot1.0: 1.0straight1.0: 4.0slightly convexcovered with stout spine-like setaesetae-lessS. davidi13.0–17.0with spot1.0: 1.0straight1.0: 2.0distinctly convexcovered with spine-like setaewith spine-like setaeS. dongxi14.0–17.0with spot1.0: 1.3straight1.0: 2.0distinctly convexcovered with spine-like setaewith spine-like setaeS. immanis18.0–25.0without spot1.0: 1.0straight1.0: 2.0nearly straightcovered with spine-like setaesetae-lessS. lacustris14.0–16.0without spot1.0: 0.9straight1.0: 3.0slightly convexcovered with spine-like setaesetae-lessS. orientalis14.0–23.0with spot1.0: 1.2straight1.0: 2.0distinctly convexcovered with spine-like setaewith spine-like setaeS. palaearcticus13.0–15.0with spot1.0: 1.0convex apically1.0: 4.0slightly convexcovered with spine-like setaesetae-lessS. polyspineus11.0–13.0without spot1.0: 1.0straight1.0: 4.0slightly convexwith sparse spine-like setaesetae-lessS. zhelochovtsevi14.0– 15.0mmwithout spot1.0: 1.0convex apically1.0: 4.0slightly convexcovered with spine-like setaesetae-less

Published as part of Qiang, Xin-He & Zhou, Chang-Fa, 2025, The species diversity and phylogeny of the genus Siphlonurus Eaton, 1868 from China (Ephemeroptera: Siphlonuridae), pp. 45 in Zootaxa 5711 (1) on page 45, DOI: 10.11646/zootaxa.5711.1.1, http://zenodo.org/record/17882788