Tegotettix cristiferus (Gunther, 1935) Borneo

Patano, Romeo R., Mohagan, Alma B., Tumbrinck, Josef, Amoroso, Victor B. & Skejo, Josip, 2021, Horned and spiky: Tegotettix derijei sp. n. (Orthoptera: Tetrigidae) is a peculiar new pygmy grasshopper species from Mindanao, Zootaxa 4933 (2), pp. 198-210 : 201-202

Tegotettix cristiferus species group

Diagnosis. Fastigial horns of variable height, from low in T. sagittarius to extremely high in T. derijei sp. n. ( Figure 6A ). Lateral ocelli placed between the compound eyes. In frontal view, frontal costa extremely short before bifurcation, almost indistinct. Facial carinae after the bifurcation divergent and straight. Shoulders (humeral part of the pronotum) elegant. Prozona extremely short. Pronotum with projections only on median carina. Femora undulated or straight. Chitinous surfaces generally smooth. This groups of species is closely related to Xistra .

Composition and distribution. This species group includes Tegotettix corniculatus ( Stål, 1877) (the Philippines: unknown locality), T. cristiferus ( Günther, 1935) (Borneo) , here described Tegotettix derijei sp. n. (the Philippines: Mindanao), and T. sagittarius ( Bolívar, 1887) . More new species await description within this species group ( Figures 3 and 4 ).

Figures

FIGURE 3. An undescribed Tegotettix species from the Philippines (A, B, D) with very high fastigial horns, resembling T. sagittarius and T. corniculatus. Photographed in Balinsasayao Twin Lakes Natural Park (Negros Oriental) (C) on May 17th 2017 by Veronica Prudente and reproduced with her permission.

FIGURE 4. Simplified biogeography of the genus Tegotettix in the islands of Oriental, Wallacean, and Papuan regions. This distribution map shows species of the genus Tegotettix and their accompanying species groups (marked by color, except for the new species which is marked red in the distribution map). Drawn by Josip Skejo.

FIGURE 6. Morphological details of Tegotettix derijei sp. n. (holotype, female).A) head in frontal view, B) head in dorsal view, C) head in ventral view, D) head and prozona in lateral view, E)—fore femur, F)—mid femur, G) antenna, H) abdomen tip in lateral view, I) abdomen tip in ventral view, J) hind femur, K) hind tibia and tarsus. Photographed by Romeo R. Patano Jr.