Argyrochlamys nigrescens, Grichanov & Gilasian, 2023

Grichanov, I. Ya. & Gilasian, E., 2023, Three new species of the genus Argyrochlamys Lamb, 1922 (Diptera: Dolichopodidae) from mangroves of Iran and Oman, Russian Entomological Journal 32 (2), pp. 210-220 : 213-215

Argyrochlamys nigrescens

Grichanov et Gilasian, sp.n.

Figs 7–14 .

MATERIAL. Holotype ♂, Iran, Bushehr Prov., Asaluyeh, Nayband, next to Mangrove forest , – 10 m, 27°24´70´´N, 052°40´9.0´´E, 6–8.XI.2021, yellow pan trap, E. Gilasian leg. ( ZIN; male terminalia dissected and stored in glycerin in microvial pinned with the specimen). Paratype. 1♂, Iran, Hormozgan prov., Sirik, Azini wharf, 0 m, 26°19´39.9´´N, 057°06´15.7´´E, 13. V .2022, pan trap, Mofidi & Hajiesmaeilian leg. ( HMIM) .

DESCRIPTION. Male ( Fig. 7 ). Similar to Argyrochlamys hajiesmaeiliani sp.n. in all respects except as noted. Length (mm): body 3.5, wing 3.4/1.2, antenna 0.9. Face ( Fig. 8 ) widest under antennae, 1.8 times wider than height of postpedicel; antenna ( Fig. 9 ) with postpedicel elongate-ovate, 1.6 times as long as high; arista-like stylus 1.7 times as long as postpedicel, positioned at distal 1/3 of dorsal surface; length (mm) of scape, pedicel, postpedicel, stylus (stylomeres 1 and 2), 0.10/0.06/0.30/0.12/0.39. Thorax mostly greenish black, with brown scutellum and yellow posterior margin of metapleuron. Legs yellow, with apex of hind tibia and whole tarsus black; mid and hind coxae brown in basal half; fore tibia with 3 small anterodorsal, 2 small posterodorsal bristles, 0–1 minute posteroventral seta; fore femur, tibia and tarsomere (from first to fifth) length (mm): 0.91/0.87/0.45/ 0.27/0.22/0.17/0.17; mid tibia with 3 anterodorsal, 3 posterodorsal, 2 weak ventrals at middle and 4 apical bristles; mid femur, tibia and tarsomere (first and second) length (mm): 1.05/1.18/0.55/0.40/-/-/-; hind femur with 1 anterodorsal preapical bristle, 1 small anteroventral preapical, rather short ventral setae, and row of dense dorsal setae, at most half as long as femur height; hind femur, tibia and tarsomere (from first to fifth) length (mm): 1.21/1.55/0.38/0.59/0.47/0.29/ 0.24. Wing ( Fig. 10 ): length of costa between R 1, R 2+3, R 4+5 and M 1+2 (mm), 0.91/0.94/0.06; length of dm-m and distal part of M 4, 0.24/0.74. Abdomen ( Fig. 11 ): mostly black; tergite 1 with yellow posterior margin; tergite 2 mostly yellow, with small black spot dorsally in middle, brown laterally; tergite 3 with yellow anterior and posterior margin; tergites 4 and 5 black, and segment 8 black; epandrium and appendages symmetric ( Figs 12–14 ); hypandrium black, deeply bifurcated, with narrow curved lobes, narrow at apex; phallus narrow; distoventral epandrial lobe fused with epandrium, with 3 pedunculate setae; 1 epandrial seta; postgonite narrow, strongly curved ventrally, pointed at apex; surstylus brownish, with 2 almost straight narrow lobes of unequal length; ventral lobe short, with 2 simple ventral setae, 1 long and 1–2 short thickened dorsal setae at apex; dorsal lobe with very long basidorsal seta, 1 long subapical simple seta, 2 short thick seta and few setulae at apex; cercus yellow, 0.8 times as long as epandrium, with short hairs and strong black setae, narrow, with rounded apex.

Female. Unknown.

ETYMOLOGY. The Latin name of the species refers to the mostly black abdomen.

DISTRIBUTION. Palaearctic: Iran (Bushehr, Hormozgan) .

DIAGNOSIS. Argyrochlamys nigrescens sp.n. males have very similar habitus and hypopygium morphology with A. hajiesmaeiliani sp.n. These species differ from each other in mainly morphometric characters (see diagnostic Table in the Discussion section). Nevertheless, the abdomen has tergites 1–3 mostly or completely yellow in A. hajiesmaeiliani sp.n., and only tergite 2 mostly yellow in A. nigrescens sp.n.

Figures

Figs 7–14. Argyrochlamys nigrescens sp.n., male: 7 — habitus; 8 — head; 9 — antenna; 10 — wing; 11 — abdomen, dorsal view; 12 — hypopygium, lateral view; 13 — hypopygium, ventral view; 14 — details of hypopygial appendages. Рис. 7–14. Argyrochlamys nigrescens sp.n., самец: 7 — внеШний вид; 8 — голова; 9 — усик; 10 — крыло; 11 — брЮШко, вид сверху; 12 — гипопигий, вид сбоку; 13 — гипопигий, вид сниЗу; 14 — детали придатков гипопигиЯ.