Nisitrus danum Robillard & Tan
Tan, Ming Kai, Wahab, Rodzay bin Haji Abdul, Japir, Razy, Chung, Authur Y. C. & Robillard, Tony, 2021, Revision of the cricket genus Nisitrus Saussure (Orthoptera: Gryllidae: Eneopterinae) and descriptions of five new species, European Journal of Taxonomy 761 (1), pp. 1-75: 31-33
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|Nisitrus danum Robillard & Tan|
Nisitrus danum Robillard & Tan sp. nov.
This new species differs from all known congeners by face part of fastigium with a black band across eyes and antennal cavity, frons otherwise yellow (reddish on preserved specimens); pronotal lateral lobe black dorsally and yellow ventrally; longitudinal white stripe only between M and R and lateral field matted black; Sc projections black. This new species is most similar to N. hughtani sp. nov. from Sumatra, but differs by the following characters: smaller in size, vertex black with yellow margin around eyes (instead of cream-coloured), frons with a black band across eyes and antennal cavity (yellow in N. hughtani sp. nov.); frons yellow (instead of black with a cream-coloured band ventral to eyes); mouthparts yellowish with some black spots; lateral part of head with a black band posterior of eye (instead of black with a cream-coloured ring around eye). This species is also similar to N. musicus from Kinabalu range, but differs by mouthparts yellow (instead of black), FIIIs not black dorsally, female papilla, and distribution: N. musicus is restricted to the highlands in the Kinabalu range, while N. danum sp. nov. occurs in the Danum Valley and Tawau Hill areas at the east of Sabah.
The specific name is a noun in apposition taken from the type locality, Danum Valley, Malaysia.
Holotype MALAYSIA – Sabah • ♀; Danum Valley Field Centre; 4°57′52.95″ N, 117°48′18.25″ E; ca 150 m a.s.l.; 26 May–20 Jun. 1987; C. v. Achterberg and Kennedy leg.; PII: N54; RMNH. GoogleMaps
MALAYSIA – Sabah • 1 ♀; Tawau Hill Park ; 4°24′0.0″ N, 117°53′24.0″ E; 7 Mar. 2018; C. Elder leg.; iNaturalist.org/observations/19511712 GoogleMaps • 1 ♀; Danum Valley ; 4°57′42.6″ N, 117°41′22.2″ E; 2 Oct. 2020; L. Day leg.; iNaturalist.org/observations/21010925 GoogleMaps .
Slender and relatively large habitus ( Figs 8D View Fig , 19 View Fig ). Vertex black with yellow margin around eyes ( Fig. 11C View Fig ). Fastigium velvety black with yellow margins. Scapes dark red brown to black (particularly on the dorsoinner margins). Antennae black with wide whitish rings. Face part of fastigium with a black band across eyes and antennal cavity, otherwise yellow (reddish in preserved specimens); frons almost entirely yellow, including mouthparts, with some black spots ( Fig. 10C View Fig ). Maxillary palpi cream-coloured; apical segment black apically ( Fig. 10C View Fig ). Lateral part of head with a black band posterior to eye ( Fig. 12C View Fig ). Pronotum covered with white setae; dorsal disk dark brown to black ( Fig. 11C View Fig ). Lateral lobes of pronotum dorsal third black, vivid yellow ventrally (cream-coloured in preserved specimens) ( Fig. 12C View Fig ). Legs generally red brown, sometimes dorsally darker. FIIIs brown, knees dark brown to black; TIIIs brown with black spines and spurs, dark brown to black near distal end; tarsomeres dark brown to black. Tergites red brown, with a pale band laterally; sternites pale, with red brown median area. Cerci red brown, short and conical.
Female FOREWINGS. FW colouration ( Fig. 14C View Fig ): veins generally yellow; cells infumated black. Longitudinal
infumated white stripe only in M and R. Lateral field matted black, Sc projections black. FW venation: 6–7 strong longitudinal veins on dorsal field, cross-veins irregular and often sinuous; lateral field with 6 projections of Sc.
GENITALIA. Ovipositor: distinctly longer than FIII; apex thin with both dorsal and ventral edges smooth. Copulatory papilla conical, smaller and stout; apex strongly folded (could be due to the preservation of specimen) ventrally, short, pointed; dorsal face with a sclerotized area ( Fig. 17E View Fig ).
See Table 5 View Table 5 .
|Females (n = 3)||2.0–2.3 (2.2)||3.2–3.5 (3.4)||10.8–11.7 (11.4)||3.5–4.2 (4.0)||6.4–7.7 (7.2)||15.3 (15.3)||2.7 (2.7)||15.5 (15.5)|
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