Eucriotettix

Tan, Ming Kai, Storozhenko, Sergey Yu, Hwang, Wei Song & Meier, Rudolf, 2017, Integrative taxonomy reveals two sympatric species of the genus Eucriotettix Hebard, 1930 (Orthoptera: Tetrigidae), Zootaxa 4268 (3), pp. 377-394 : 384

Key to species of Eucriotettix from Singapore

1. Hind femur stouter, 3.2 times as long as wide. External lateral carina of pronotum distinctly raised and infrascapular area broadened ( Fig. 7 А). Lower side of the lateral lobes of pronotum deeply excised behind triangularly pointed projection ( Fig. 7 B).............................................................................. E. ridleyi Günther, 1938

- Hind femur slender, 3.4–3.8 times as long as wide. External lateral carina of pronotum almost straight and infrascapular area narrow ( Figs 5 C, 5D, 6C, 6D). Lower side of the lateral lobes of pronotum behind triangular projection weakly excised ( Figs 5 B, 6B) or almost straight ( Figs 5 A, 6A)...................................................................2

2. Frontal ridge narrow; antennal socket situated distinctly above the lower margin of eyes ( Fig. 8 B). Fore femur 3.8–4.1 times as long as wide; hind femur 3.4–3.5 times as long as wide. Lower side of the lateral lobes of pronotum behind triangularly pointed projection almost straight ( Fig. 8 A). Male subgenital plate in lateral view shallow excised near apex ( Fig. 8 D). Posterior margin of female subgenital plate broadly rounded with indistinct median projection ( Fig. 8 G)........... E. guentheri sp. nov.

- Frontal ridge broadened; antennal socket situated between the lower margin of eyes ( Fig. 8 I). Fore femur 4.2 times as long as wide; hind femur 3.6–3.8 times as long as wide. Lower side of the lateral lobes of pronotum behind projection excised ( Fig. 8 H). Male subgenital plate in lateral view deeply excised near apex ( Fig. 8 K). Posterior margin of female subgenital plate straight with distinct medial projection ( Fig. 8 N)............................................ E. simulans sp. nov.

Figures

FIGURE 5. Habitus of male of Eucriotettix guentheri sp. nov. (TET. TET. 84) (A, C) and Eucriotettix simulans sp. nov. (TET. TET. 47) (B, D) in dorsal (A, B) and lateral (C, D) views. Scale bars = 1 mm.

FIGURE 7. Holotype of Eucriotettix ridleyi body in dorsal (A) and lateral (B) views; (C) labels. Image by Robin Ngiam.

FIGURE 8. Eucriotettix guentheri sp. nov. (A – G) and Eucriotettix simulans sp. nov. (H – N): male head and anterior of pronotum in dorsal view (A, H); male face in frontal view (B, I); head, male pronotal lateral lobe and tegmen in lateral view (C, J); male (D, K) and female (F, M) abdominal apices in lateral view; male (E, L) and female (G, N) abdominal apices in ventral view. Scale bars = 1 mm.