Allometopon eotoxon, Owen Lonsdale, 2016

Owen Lonsdale, 2016, Revision of the genus Allometopon Kertész (Diptera: Clusiidae), Zootaxa 4106 (1), pp. 1-127 : 22-23

publication ID	https://doi.org/ 10.11646/zootaxa.4106.1.1
publication LSID	lsid:zoobank.org:pub:A5ADF236-5219-4014-9DC4-C43F981DD1A4
DOI	https://doi.org/10.5281/zenodo.6057232
persistent identifier	https://treatment.plazi.org/id/6866497B-F102-3462-FF39-A74BF5BAFDDB
treatment provided by	Plazi
scientific name	Allometopon eotoxon
status	sp. nov.

Treatment

Allometopon eotoxon View in CoL spec. nov.

Figs 52–56 View FIGURES 52 – 56

Description. General: ( Figs 52, 53 View FIGURES 52 – 56 ) Body length 4.3mm. Arista sparsely plumose. M1+2 ratio 3.3. Condition poor, most legs and setae missing (relative size of setae evident from sockets); head, legs and abdomen missing from paratype. Female unknown.

Chaetotaxy: Three fronto-orbital setae (anterior seta shorter). Ocellar and postvertical setae well-developed. Interfrontal seta absent. Anterior dorsocentral half length of posterior dorsocentral. Acrostichal seta present. One lateral scutellar seta.

Colour: Setae yellow to light brown. Head mostly yellow; ocellar spot triangular and relatively long; first flagellomere, gena and parafacial white; gena and postgena silvery tomentose. Scutum yellow with pointed postsutural stripe (posteromedial margin with yellowish spot) slightly extending into presutural region; paratype with stripe paler anteriorly and reaching light brown anterior margin; one pair of short, thin, brownish intra-alar stripes that in paratype continue anterior to suture and are accompanied by one pair of faint presutural spots. Scutellum brown to light brown. Metanotum white with small spot below scutellum. Pleuron and legs white. Halter white. Wing lightly clouded along anterodistal margin. Abdomen mostly brown; tergite 1 yellow with one pair of wide ill-defined spots; epandrium dark brown; surstylus and cercus white.

Male terminalia: ( Figs 54–56 View FIGURES 52 – 56 ) Annulus well-developed with spiracle free from sclerite. Epandrium slightly longer than wide and high. Cerci fused, small and rounded. Surstylus approximately as long as epandrium, strongly hooked, with small, pointed anterobasal process and shallow, rounded posterobasal process on inner face; tuberclelike setae along length of apical and posterior margins on inner face. Anterior margin of hypandrium wrinkled and produced; ventral lobe not evident, fused to arm and with two long apical setae. Phallapodeme rod-like, welldeveloped, with apex of ventral shield curved to meet anterior margin of hypandrium. Basiphallus relatively short. Epiphallus and postgonite well-developed. Pregonite setose, irregular and membranous with anterior margin produced (this region possibly homologous with lateral margin of hypandrium). Distiphallus approximately 2/3 length of phallapodeme. Paraphallus long and largely membranous, excluding spinulose region.

Etymology: The specific epithet compounds the Greek for "bow" (toxon), referring to the shape of the surstylus, and the Greek for east (eos), referring to the distribution of this taxon with respect to its sister species, A. hesperotoxon .

Distribution: Papua New Guinea.

Holotype: PAPUA NEW GUINEA. Morobe Province: District Wau., Big Wau Crk., 1400m, 15.ix.1970, P.J. Shannon (1♂, CASC).

Paratype: PAPUA NEW GUINEA. Same collection as holotype (1♂, CASC).

Comments: Allometopon eotoxon is allied to A. hesperotoxon ( Figs 100, 101 View FIGURES 100 – 106 ) and A. machaeroges ( Fig. 157 View FIGURES 157 – 161 ) (see comments for A. hesperotoxon ), but can be differentiated on the basis of an absence of a medial stripe on the frons and a dorsal stripe on the male first flagellomere (stripe vestigial to absent in A. hesperotoxon males), the palpus and pleuron are entirely pale, the paraphallus is broader and membranous, and the distiphallus and hypandrial setae are longer.