A key to species of Eurhaphidophora in Thailand for males (updated from Dawwrueng et al., 2020)

1. Posteromedian process of ninth abdominal tergite narrow in dorsal view (Figs 5A, D).

- Posteromedian process of ninth abdominal tergite broad in dorsal view (Figs 1D, 5G)............................... 3

2. Posteromedian process of ninth abdominal tergite very narrow and long (approximately 3 times as long as wide), with rounded apex in dorsal view (Fig 5A) and one ventral pair of thin spines visible in posterior view (Fig 5B); epiproct elongate (Fig 5C)............................................................................................ E. bispina

- Posteromedian process of ninth abdominal tergite less narrow and rather short (approximately 1.7 times as long as wide), with widely angular apical notch at apex in dorsal (Fig 5D) and posterior (Fig 5E) views; epiproct clearly wider in proximal half (Fig 5F)............................................................................... E. tarasovi doitungensis

3. Posteromedian process of ninth abdominal tergite entirely separated from dorsal part of this tergite by one weak arcuately transverse fold (Fig 5G); this process widely truncate (Fig 5H) and strongly curved downwards; epiproct broad and with small apical tubercle (Fig 5I)................................................................... E. pawangkhananti

- Posteromedian process of ninth abdominal tergite not separated from dorsal part of this tergite (Fig 1D); this process almost straight and directed backward, with rounded (in dorsal view) distal part having distinct apical notch (Fig 1D, E); epiproct narrower and with rather thin and long apical part directed forward (Figs 1G–I)................... E. apicoexcisa sp. nov.

A key to species of Eurhaphidophora in Thailand for females

(except for E. tarasovi doitungensis)

1. Eighth and/or ninth abdominal tergite with short and rounded posteromedian projection (Figs 3A, 4J).

- Eighth and ninth abdominal tergites without any posteromedian projection................................. E. bispina

2. Ninth abdominal tergite with distinct posteromedian projection slightly concave in middle part (Fig 5J); subgenital plate rather long, with narrowed apical part moderately long and acute (Fig 5K); ovipositor with narrowly rounded apex (Fig 5L)............................................................................................ E. pawangkhananti

- Ninth abdominal tergite with short and widely rounded posteromedian projection (Fig. 3A); subgenital plate shorter, with narrowed apical part short and subacute (Fig 3C); ovipositor with acute apex (Fig 3D)............. E. apicoexcisa sp. nov.