Geoffagraecia gwinganna Rentz & Su

Rentz, Dcf & Su, You Ning, 2020, Studies in Australian Tettigoniidae: New Fully-winged Agraeciini From Northeastern Australia (Orthoptera: Tettigoniidae; Conocephalinae; Agraeciini), Zootaxa 4743 (3), pp. 301-336: 315-320

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Geoffagraecia gwinganna Rentz & Su

gen. et sp. nov.

Geoffagraecia gwinganna Rentz & Su   , gen. et sp. nov.

( Figs 7 View FIG A–C, 8A–N, 13D, E; Map 2 View MAP 2 ; Table 1 View TABLE 1 )

ANIC Number; Gen. Nov. 26, sp. 1

Geoff’s Gwinganna Katydid

4 Named for Geoff Monteith for his efforts and pursuit of topics orthopterological. Feminine gender.


Holotype male. Label 1. “ 28.11S 153.23E ‘Gwinganna’, Lookout Junction, 6km SWbyS of Tallebudgera , QLD. 18- 023 April 1995 D. Rentz, W. Lee & M. Upton, Stop 94-3”. 2. “ ANIC database #14008714”. Holotype in Australian National Insect Collection , Canberra . GoogleMaps  

Differential Diagnosis. Overall body shape and size small and robust ( Figs 7A, B View FIG ). Colour of all specimens deep, richly green in head, pronotum, legs and dorsum of abdomen. Tegmina and wings lighter green or greyish and with minute speckles. Precostal area of tegmen with a few cells dark brown ( Fig. 8G View FIG ); antennal scape and pedicel dark olive green on cephalic face ( Fig. 8B View FIG ), much lighter green on caudal face; membranous portion of fore femur black ( Fig. 8C View FIG ), this colour extending slightly onto femur, tibia dark brown to black at each end of auditory tympanum; middle femur with similar dark membranous portion and with a single small dark brown spot on each side of adjacent femur; hind femur with similar black membranous portion, adjacent portion with a small black patch extending onto ventral surface ( Fig. 8D View FIG ). Eye brown, base not rimmed with yellow. Male cercus distinctive ( Figs 8E, F View FIG ), boat-shaped, with small subapical tooth; subgenital plate much longer than broad, styles elongate ( Fig. 8I View FIG ), slightly decurved and longer than length of one side of median incision. Female cercus very elongate, slender, tip gently decurved; subgenital plate short, with narrow, shallow V-shaped median incision. Ovipositor very short, falcate, both surfaces unarmed ( Figs 7C View FIG , 8N View FIG ). Male tenth tergite ( Fig. 8H View FIG ); titillators apically bearing a hood ( Fig. 8J View FIG ). Stridulatory region and file very small ( Fig. 13E View Fig ), Wing well developed. Both sexes capable of flight.

Head. Head strongly slanting, produced well above pronotum; frons smooth, shiny, without carinae or punctations; frontal fastigium absent; fastigium of vertex short, spike-like as in Greenagraecia species, not extending greatly forward, lateral ocelli at base on each side, median ocellus small, faintly indicated between antennal bases. Eye situated high on head, bulging. Antennal scape elongate, about 2.5 x as long as pedicel; flagellum slightly longer than length of body.

Thorax. Pronotum with surface shining, with minute punctations or indentations ( Fig. 7A View FIG ); surface of disk without well-defined sulci; lateral lobes shallow ( Figs 7A, B View FIG ), ventral margin rimmed, gradually inclining cephalad, posterior portion covering most of thoracic auditory tympanum. Prothorax with a pair of minute to slightly larger, widely spaced knob-like or spiniform processes; meso- and metathorax not modified, caudal margins sub-angularly produced.

Legs. Legs moderately elongate. Fore coxa armed with an elongate spine. Foreleg with femur slender, distinctly laterally compressed basally, surface shining but appearing minutely wrinkled, ventral surface unarmed ( Fig. 8C View FIG ); tibia somewhat expanded on each side of auditory structure, dorsal surface unarmed, ventral surface with 6 spines on each side. Midleg about the same length as foreleg, femur slightly laterally compressed, ventral surface armed on anterior margin with 2–4 minute spines positioned distally, posterior margin unarmed; tibia unarmed dorsally, ventral surface with 6–7 minute spines on each margin. Hind leg with femur slender with surface shining, minutely wrinkled, ventral surface armed only on external margin with 3–4 minute spines; tibia with many elongate spines on both margins of dorsal surface, ventral surface with a much small number of similar spines; apex of tibia with 2 spines on both dorsal and ventral margins. Genicular lobes of fore and middle femora appearing unarmed but fore femur with a minute spine on anterior margin of ventral surface, hind femur armed on both sides with a substantial spine. Hind femur extending to or slightly beyond abdomen at rest.

Wings. Tegmina elongate, slender, apically acute ( Fig. 8G View FIG ), costa absent, costal region normal, with large irregular cells, veins not especially thickened; stridulatory region ( Fig. 8G View FIG ) hidden by pronotum, very small, mirror without central venation; stridulatory vein short, poorly indicated dorsally, file ( Fig. 13E View Fig ) with the larger lamellar teeth positioned apically; bearing 104 teeth. Wing well developed with both sexes capable of flight.

Abdomen. Tenth tergite well produced, caudal margin not incised, undulating. Cercus rather simple ( Figs 8E, F View FIG ), boat-shaped, a small internal tooth positioned subapically. Phallic complex; titillators with arms parallel, apically bearing a membranous hood, base narrowed and feebly serrate along the dorsal margin ( Fig. 8J View FIG ). Subgenital plate much longer than broad, styles elongate, about as long to slightly longer than one side of median incision.

Female. Differs from male in following characters. Size slightly larger, tenth tergite with deep narrow median sulcus; cercus elongate, hirsute, apically slightly decurved ( Fig. 7C View FIG ); subgenital plate longer than broad, apex with shallow V-shaped median incision ( Figs 8L, M View FIG ). Base of subgenital plate appearing to not have an opening or pit. Ovipositor falcate and short ( Figs 7C View FIG , 8N View FIG ), unarmed on both surfaces.

Coloration. Overall coloration dark, deep green except tegmina greyish with dark spots in some cells; wing grey. Frons greenish yellow, mandibles dark brown to black. Antenna with scape and pedicel darker on cephalic surface than caudal surface, flagellum light brown. Legs green; fore middle and hind femora and tibiae with distinctive marks ( Figs 8C, D View FIG ); tarsi uniformly greyish or light brown. Tegmen with costal region with cells slightly darker than the rest, veins greyish green.

Specimens Examined. Paratypes. Queensland. 28 O 11’S 153 O 23’E ‘Gwinganna’, Lookout Junction, 6 km SWbyS of Tallebudgera, 18–23.iv.1995 (DCF Rentz, W Lee, M Upton, Stop 94-3, 1 male, 1 female, ANIC). New South Wales. 28 O 37’S 153 O 19’E Big Bend Floral Reserve, Gibbergunya Rd, Whian Whian State For. Res., NNE of Lismore, 19.xi.1981 (DCF Rentz, MS Harvey, Stop 58, 1 female, ANIC). 31 O 41’S 152 O 41’E The Bird Tree, Middle Brother State For, nr Kendall, 16.xi.1983, (DCF Rentz, MS Harvey, Stop 50, 1 male ANIC).

Comments. G. gwinganna   is not uncommon in the understorey vegetation that borders wet sclerophyll forests. As with others in this group, the katydids are active after dark where they are opportunists and forage on vegetation feeding on a variety of animal and plant material. This species is easily distinguished from other similar agraeciines by the combination of the stridulatory portion of the male tegmina being hidden under the caudal margin of the pronotum, shape of the male cercus, the hooded male phallic complex and the falcate ovipositor. Additional characters are provided in the key. Specimens from New South Wales did not differ significantly in several morphological characters and are considered conspecific.

The specimen from Big Bend Floral Reserve bears a morphological anomaly in that the right fore femur bears a small tarsus ( Fig. 8K View FIG ) at its tip. There is no tibia on the right foreleg.

Judging by our experience with other members of this tribe, we would not be surprised to find additional species of Geoffagraecia   in similar habitats in south-eastern Queensland and north-eastern New South Wales.

Barbaragraeciaƽ Rentz & Su, gen. et sp. nov.

ANIC Number: Gen. Nov. 26 (in part)

Unicorn Katydids

Type species: Barbaragraecia unicorn Rentz & Su   , here designated.

Barbaragraecia presently comprises two distinctive and common species in the Kuranda and Atherton Tablelands and Daintree rainforests. They are distinctive in the following combination of characters: richly dark green or brown with legs that contrast with the greyish green tegmina or light brown with facial markings; the slender elongate fastigium of the vertex that curves forward in both species and is unique among the north Queensland agraeciines but not uncommon in agraeciines from elsewhere (see Naskrecki & Rentz 2010, Ingrisch 2019). Like other members of the tribe, these katydids hide by day and emerge after dark to feed on a variety of animal and vegetal matter. They can be considered as opportunists since they are as likely to feed on spiders and caterpillars as well as flowers, pollen and nectar.

Generic description. Body robust and moderate to fairly large ( Table 1 View TABLE 1 ). Both sexes fully winged, capable of flight ( Fig. 9A View FIG , 11A View FIG ). Head strongly slanting, jaws large; frons shining but minutely punctate, the punctations irregular and evenly distributed across the frons and genae; ocelli prominent. Eye ovoid, strongly bulging, positioned high on head; frontal fastigium a low swelling between the antennal bases; fastigium of vertex elongate, acuminate and directed forward, surface without sulcus; antenna with scape elongate, about twice as long as pedicel, only slightly longer than length of fastigium and bearing a prominent tooth apically on internal margin, flagellum about twice the length of body, not annulate but slightly darker in distal half; median ocellus minute, lateral celli much larger. Pronotum rather short ( Table 1 View TABLE 1 ), surface, including lateral lobes, with a network of minute rugulae, median portion of disk with a short, shallow sulcus indicated mostly by colour; lateral lobes with a deep concavity in the middle, ventral margin rimmed and ascending cephalad; cephalic margin of disk feebly concave in the middle, caudal margin truncate, metathorax sellate, area above thoracic auditory structure dome-like. Tegmina elongate, extending slightly beyond tip of abdomen; stridulatory region very well developed and not hidden by pronotum; stridulatory file ( Fig. 13F, G, H View Fig ) with teeth lamellar, the larger teeth positioned apically; costa fairly well developed, precostal region broad basally, narrowing apically. Prothorax bearing a pair of widely spaced elongate spines; meso- and metathorax each cup-shaped, metathorax with an apical digitiform process. All legs normal, not abnormally short or long. Fore femur laterally compressed, ventral surface armed on both sides with substantial spines; tibia cylindrical, unarmed dorsally, ventral surface armed on both margins. Middle femur laterally compressed, ventral surface armed on anterior margin with several spines, posterior margin unarmed or with a few minute spines; tibia cylindrical, slightly swollen basally, unarmed dorsally but armed ventrally on both margins. Hind femur stout in males, slightly proportionately longer in females, armed ventrally only on external margin; tibia elongate, armed dorsally and ventrally with many spines on both margins, dorsal margin of apex with 2 elongate spurs, ventral surface with 4 apical spurs, the middle pair much shorter than the outer. All genicular lobes armed with a spine on each side. Abdomen normal; male tenth tergite well indicated, with a soft, shallow median depression on caudal margin; titillators with membranous portion bearing a pair of apical sclerites, irregular in shape, arms heavy at base but abruptly becoming spatulate and hirsute apically; cercus platyform, without internal tooth, internal portion produced, each tooth armed with minute teeth; subgenital plate slightly longer than broad, with relatively deep median incision, styles short, shorter than one side of median incision. Female with tenth tergite apically truncate with narrow median sulcus; cercus long and slender apex rather abruptly narrowed; subgenital plate broader than long, apex with broad shallow median incision. Ovipositor falcate, unarmed on dorsal and ventral margins.

Head, pronotum and legs green or brown depending upon the species. Head with scape and pedicel green or brown, flagellum light reddish brown, somewhat darkened apically. Legs with knees darkened, a light brown spot just below knees. Tegmen brown or greyish with media and radius greenish, network of veins light brown with greenish overcast, many cells with dark brown centres; precostal region with all cells dark brown.

Diagnosis. Barbaragraecia is distinguished from all other known agraeciine genera by the fastigium of the vertex being elongate and directed forwards, the male subgenital plate with a tooth on each side adjacent to the cercus and the falcate ovipositor.

Barbaragraecia unicorn   6 Rentz & Su, gen. et sp. nov.

( Figs 9 View FIG A–C, 10A–M, 13F; Map 1 View MAP 1 ; Table 1 View TABLE 1 )

Unicorn Katydid


Australia, Australian Capital Territory, Canberra City, CSIRO, Australian National Insect Collection