Dendrobia octopunctata, Hemp & Ingrisch & Heller, 2017

Hemp, Claudia, Ingrisch, Sigfrid & Heller, Klaus-Gerhard, 2017, A new genus and other new species of Agraeciini from the Eastern Arc Mountains, East Africa (Orthoptera: Tettigoniidae; Conocephalinae; Agraeciini), Zootaxa 4311 (1), pp. 1-22: 9-12

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Dendrobia octopunctata

n. sp.

Dendrobia octopunctata   n. sp. Hemp C.

( Figs. 12–18 View FIGURE 12 View FIGURE 13 , 29) Orthoptera

Holotype male. Tanzania, Udzungwa Mountains National Park, Ngologolo Mountains, January 2017   . Depository MfN. Further paratype material: 1 female, same data as holotype. Depository MfN. Further paratype material: 1 female   , same data as holotype but June 2016 (caught as small nymph, adult September 2016). Collection C. Hemp.  

Description male. Habitus and colour. Plump medium-sized insect, predominantly leaf green with brownreddish broad fascia on margins where tegmina meet medially. Remaining part of tegmina with pattern of green veins surrounding light green center. Pronotum with 8 shiny black dots arranged in pairs. Eyes reddish. Joints of hind femora with tibiae black, fore and mid femora green ( Fig. 12 View FIGURE 12 ). Head and antennae. Face broad, predominantly of white colour (female, Fig. 13 View FIGURE 13 ). Antennae yellowish-tawny. Fore and mid femora with 4 stout spines ventroanteriorly, white, sometimes with black tips. Hind femora with 8–9 broad-based spines ventro-anteriorly along whole length and 1–2 stout spines near joints to tibiae ventro-posteriorly. Stridulatory file with about 130 teeth ( Fig. 14). Abdomen. Last abdominal tergite broad with almost straight posterior margin with a median depression. Cerci stretched with bulb-like setose bases, then suddenly narrowing into finger-like apex ( Fig. 15A View FIGURE 15 ). Supra-anal plate bulgy triangular. Subgenital plate broad, posterior margin v-shaped incised, with thin styli ( Fig. 15 A View FIGURE 15 ).

Female. Similar in habitus and colour as male with same spination ( Fig. 16 View FIGURE 16 ). Ovipositor long, slightly upcurved with smooth sclerotized valves ( Fig 17 View FIGURE 17 A). Subgenital plate with median rectangular incision on posterior margin and lateral processes ( Fig. 17 View FIGURE 17 B).

Measurements, males (mm) (N=1). Total length of body (including cerci): 29; Median length of pronotum 13.3; Length of hind femur 15.8; Length of elytra 22.4.

Measurements, females (mm) (N=2). Total length of body 30.9–34.8; Median length of pronotum 11.8–12.5; Length of hind femur 16.9–20.2; Length of elytra 21.2–25.5; Length of ovipositor 14.2–15.1.

Song. Short loud raspy chirps produced irregularly with long gaps of silence during evening and night hours. Sound structure similar to D. amaniensis   n. sp., but echeme sequence with less but longer echemes each containing more syllables (last echeme ca. 17 syllables, rate 38 Hz; Fig. 10 View FIGURE 10 ; only one recording with echoes available). The spectrum of the song broad-banded with a maximum at about 8 kHz ( Fig. 11 View FIGURE 11 ).

Biology. Dweller of the tree canopy. Probably predaceous, in captivity feeding on fruit, cereals and insect parts.

Habitat. Submontane to montane forest.

Distribution. Tanzania, Udzungwa Mountains National Park, Ngologolo Mountains.

Etymology. Named after the eight dots on the pronotum, from Latin – octo = eight and - punctata = dotted.

Diagnosis. D. amaniensis   n. sp. is differentiated from D. octopunctata   n. sp. by the number of black dots on the pronotum, 6 in D. amaniensis   n. sp. and 8 in D. octopunctata   n. sp. ( Fig. 18 View FIGURE 18 ). Males have very differently shaped cerci, laterally expanded in D. amaniensis   n. sp. and with bulb-like bases and a narrow finger-like apex in D. octopunctata   n. sp. Females of both species have differently shaped subgenital plates (compare Fig. 9 View FIGURE 9 and Fig. 17 View FIGURE 17 B). Also the song differs between the two species ( Fig. 10 View FIGURE 10 ).


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