Genus Dilacreon Fennah, 1980

Museums

Regional Maps

Introduction

Until Löcker et.al. (2010) found three species in the far north of Queensland (including Torres Strait islands) and the Northern Territory, this genus was represented in the Australian and Oceanic regions by 16 species, none of which was recorded in Australia. Fennah (1980) recognised two subgenera in the genus, the nominal subgenus and Eluzalmon Fennah. The three Australian species belong to the subgenus Dilacreon; Eluzalmon is restricted to New Guinea.

Distribution

States

Northern Territory, Queensland

IBRA and IMCRA regions

IBRA

NT, Qld: Cape York Peninsula (CYP), Darwin Coastal (DAC)

Other Regions

Torres Strait Islands terrestrial, marine & freshwater

Diagnosis

Morphology. Body length: ♂ 3.9–4.9 mm; ♀ 4.0–5.2 mm. Head: Head including eyes about as wide as or wider than pronotum. Vertex with distinct or indistinct median carina covering entire length of vertex; lateral carinae slightly elevated; anterior margin of vertex straight or convex; subapical carina absent. Frons visible or invisible in dorsal view; maximum width of frons no more than 2x apical width; position of maximum width of frons distinctly dorsad of centre of frontoclypeal suture; median carina complete; lateral carinae slightly elevated. Frontoclypeal suture distinctly semicircular, bent upwards, median part not reaching lower margin of antennal scape. Lateral carinae of anteclypeus well developed. Rostrum just reaching or slightly surpassing hind coxae; subapical segment of rostrum 1.4–1.9 times longer than apical segment. Thorax: Angle of hind margin of pronotum more or less rectangular. Forewing with crossvein MP-CuA less than half as long as vein MP from M fork to crossvein MP-CuA; Sc+R fused, forming common stem Sc+R, M emerging separately from basal cell or Sc+R+M forming very short common stem; crossvein MPCuA much shorter than MP from M fork to crossvein and much shorter than crossvein R-M; RP apically bifid; MA apically trifid; 10 apical cells. Hind leg: tibia with 6 apical teeth (innermost tooth smallest and least sclerotised); 1st tarsomere with 7 (rarely 6) apical teeth; 2nd tarsomere with 8 apical teeth and 3 platellae or fine setae. Female genitalia: Ovipositor elongate, orthopteroid, slightly curved upwards, reaching but not surpassing anal style; 8th sternite medially very long, slightly bent dorsad, posterior margin u-shaped; anal segment square (as long as wide) or rectangular (wider than long) in dorsal view; anal style as long as wide or slightly longer than wide; 9th tergite without wax plates. (Löcker et.al. 2010)

ID Keys

Löcker, B. and Fletcher, M.J (2010). Illustrated Key to the Genera of the Tribe Eucarpiini found in Australia (Hemiptera: Fulgoromorpha: Cixiidae) http://www1.dpi.nsw.gov.au/keys/fulgor/cixiid/eucarpiini/eucar00.htm

Diagnosis References

Löcker, B., Fletcher, M.J. & Gurr, G.M. 2010. Taxonomic revision of the Australian Eucarpiini (Hemiptera: Fulgoromorpha: Cixiidae) with the description of nine new species. Zootaxa (2425): 1-31 [7]

General References

Fennah, R.G. 1980. The genus Bajauana and two allied new genera in New Guinea (Fulgoroidea: Cixiidae). Pacific Insects 22(3-4): 237-328 [242]

Löcker, B., Fletcher, M.J. & Gurr, G.M. 2010. Taxonomic revision of the Australian Eucarpiini (Hemiptera: Fulgoromorpha: Cixiidae) with the description of nine new species. Zootaxa (2425): 1-31 [8]

History of changes