Neoephemera

Holland, Victor B., Beaty, Steven R. & Jacobus, Luke M., 2016, A new species of Neoephemera McDunnough, 1925 (Ephemeroptera: Neoephemeridae) from North Carolina and Virginia, Zootaxa 4138 (1), pp. 139-154 : 151

Key to final instar nymphs of North American Neoephemera species

(modified from Bae & McCafferty 1998 and Berner 1956)

1 All legs with lengths subequal to each other ( Fig. 1); tarsal claws sharply curved ( Fig. 9 ); anterolateral projections rudimentary and anterosubmedian tubercles absent on pronotum ( Figs 1 & 14 ) USA: North Carolina, Virginia............... N. eatoni

- Legs increase in length from pronotum to metanotum; tarsal claws gradually curved ( Fig. 11 ); pronotum and mesonotum with moderate or well developed anterolateral projections ( Figs 13 & 15–17 ).......................................... 2

2(1) Distinct, well developed pronotal anterolateral projections present ( Fig. 13 ). Body 14–17 mm, eastern Nearctic USA: Georgia, North Carolina, South Carolina, Tennessee, Virginia, West Virginia..................................... N. purpurea

- Moderately developed anterolateral projections present on pronotum and mesonotum ( Figs 15–17 ). Body 8–11 mm ....... 3

3(2) Small distinct anterosubmedian tubercles present on pronotum ( Fig. 15 ). Rounded anterolateral projections present on mesonotum. Rudimentary rounded projections present posteromedially on abdominal terga VI–VIII, eastern Nearctic USA; Alabama, Florida, Georgia, North and South Carolina.................................................. N. youngi

- Pronotum with large, distinct anterosubmedian tubercles ( Figs 16–17 ). Mesonotum with distinct pointed anterolateral expansions; distinct tubercles present posteromedially on abdominal terga VI–VIII...................................... 4

4(3) Anterosubmedian pronotal tubercles approximate and apically parallel to convergent ( Fig. 16 ) USA: Florida and Georgia.............................................................................................. N. compressa

- Anterosubmedian pronotal tubercles well separated and apically divergent ( Fig. 17 ) Canada: Quebec; USA: Indiana, Michigan ( Bae & McCafferty 1998), Wisconsin ( Schmude et al. 2012), and Virginia (CSU, see Additional Materials Examined)................................................................................................... N. bicolor

Figures

FIGURES 9 – 17. Neoephemera species, nymphs: 9, N. eatoni sp. nov. hindleg, dorsolateral view; 10, short bifurcate plumose setae on dorsolateral surface of N. eatoni sp. nov. femora, scale bar = 40 µm; 11, N. youngi hindleg, dorsolateral view; 12, bifurcate plumose setae on dorsolateral surface of N. youngi femora, scale bar = 40 µm; 13 – 17, Neoephemera nymphs thoracic nota, dorsal view; 13, N. purpurea; 14, N. eatoni sp. nov.; 15, N. youngi; 16, N. compressa; 17, N. bicolor.