Allometopon monstrum, Owen Lonsdale, 2016

Owen Lonsdale, 2016, Revision of the genus Allometopon Kertész (Diptera: Clusiidae), Zootaxa 4106 (1), pp. 1-127 : 46-47

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.3507049
persistent identifier	https://treatment.plazi.org/id/6866497B-F13A-345A-FF39-A61AF5AFFDDB
treatment provided by	Plazi
scientific name	Allometopon monstrum
status	sp. nov.

Treatment

Allometopon monstrum View in CoL spec. nov.

Figs 309, 310 View FIGURES 307 – 314. 307, 308

Description. General: ( Figs 309, 310 View FIGURES 307 – 314. 307, 308 ) Body length 5.8mm; body robust. Arista short plumose. M1+2 ratio 2.8. Veins R4+5 and M1 slightly convergent. First flagellomere enlarged, reniform. Male unknown.

Chaetotaxy: Four fronto-orbital setae (decreasing in length anteriorly). Ocellar seta well-developed, slightly longer than tubercle. Postvertical seta absent. Interfrontal seta minute. First flagellomere along margin with medial (not extending much dorsally of arista base) and anteroventral hairs longer than width of base of arista. Anterior dorsocentral half length of posterior dorsocentral, and small additional seta (enlarged setula) in front of anterior dorsocentral; setae closely set posteriorly. Acrostichal seta as long as anterior dorsocentral. Lateral scutellar setae long and with near transverse arrangement.

Colour: Setae dark brown. Head partly yellow (white below level of antenna); frons dark brown with anterior margin fading to a narrow orange band, lateral margins with more clearly delimited yellowish-orange line encompassing base of fronto-orbitals and verticals, and brownish ocellar tubercle surrounded by small, sharply delimited orange-yellow triangular spot that reaches back of head; first flagellomere black; palpus dark brown on distal half (slightly further along outer margin); gena and anterior margin of postgena silvery tomentose. Notum yellow with wide, ill-defined central scutal stripe extending outside dorsocentral rows and slightly constricted at base and suture; barely continuing onto anterior margin of scutellum. Pleuron and legs yellow with fore tarsus brownish. Wing clear. Halter white. Abdomen brown, yellow past midpoint of segment 7.

Female terminalia: Not dissected.

Etymology: The specific epithet reflects the unusually large size of this robust-bodied species.

Distribution: Indonesia (West Java).

Holotype: INDONESIA. West Java: Tjibodas, 0 9, Mt. Gede, [06˚47′S, 106˚59′E], 4500ft., Bryant & Palmer (1♀, USNM).

Comments: Allometopon monstrum is the largest Allometopon at 5.8mm. Belonging to the A. palpale species group, it is also robust-bodied with an apically dark palpus, a strong acrostichal seta, and two pairs of strong lateral scutellar setae arranged in a row across the scutellum. While known from a single female, official description is warranted on the basis of its unusual and species-specific colouration, most notably, the wide, dark stripe on the frons that reaches the posterior margin but not the eye margin, leaving a distinct yellow triangle around the ocellar tubercle. The notum is also yellow with a wide brownish scutal stripe and brownish fore tarsi, and like some other species in the group, the first flagellomere and most of the apical region of the palpus is dark brown or black and there are four fronto-orbitals.