Lycoriella barkalovi, Menzel & Vilkamaa, 2021

Menzel, Frank & Vilkamaa, Pekka, 2021, New species and records of Lycoriella Frey (Diptera, Sciaridae) from the Holarctic region, Zootaxa 5072 (6), pp. 501-530 : 503-505

Lycoriella barkalovi sp. n.

Figs 1B , 3B

Material studied. Holotype male. RUSSIA, Krasnoyarsk region, Taimyr Nature Reserve, Aru-Mas , 72.50°N, 101.94°E, pan trap, 12–22.VII.2010, A. Barkalov (in ISEA) . Paratypes. RUSSIA, same data as holotype, 2 males (1 in MZH, http://id.luomus.fi/GE.1810; 1 in SDEI) ; same data but 9–20. VII .2010, 2 males (1 in MZH, http:// id.luomus.fi/GE.1809; 1 in SDEI) ; Krasnodarsk region , Taimyr Peninsula, River Zakharova Rassokha, 72.70°N, 101.08°E, pan trap, 1–10. VII .2011, A. Barkalov , 1 male (in ISEA) .

Description. Male. Head. Face and antenna concolorous brown, maxillary palpus pale brown. Eye bridge 3 facets wide. Face with 20–26 setae. Clypeus with 2–3 setae. Maxillary palpus with 3 segments, 1 st segment longer than 3 rd segment, 2 nd segment shortest; 1 st segment with 5–7 setae, with small dorsal pit with sensilla; surface of antennal flagellomeres smooth, body of 4 th antennal flagellomere 2.40–2.95x as long as wide, neck as long as wide, longest setae longer than width of flagellomere. Thorax. Brown; setae pale. Anterior pronotum with 4–7 setae. Proepisternum with 3–10 setae. Scutellum with 2 long and some short and fine setae. Wing. Hyaline. Length 1.6–1.8 mm. Width/length 0.40.Anal lobe small. Veins distinct, except for stM. c/w 0.65–0.75. R1/R 0.70–0.85. stM longer than fork of M. bM longer than r-m, stCuA shortest. bM and r-m non-setose. Halter yellow. Legs. Brown; setae pale. Fore tibial organ forming large patch of many setae in demarcated depression. Fore tibial spur shorter than apical width of tibia. Abdomen. Pale brown; setae pale and moderately long. Hypopygium ( Fig. 1B ). Brown, like abdomen. Intergonocoxal area short, without lobe or seta group. Gonocoxa narrow, longer than gonostylus, with dense and moderately long setosity, at medial margin short. Gonostylus ( Fig. 3B ) very narrow, widest basally, distinctly narrowed in basal third, impressed medially at the narrowed part; apex densely setose, with strong apical tooth; with 3–4 medial megasetae in apical third, megasetae narrow, slightly curved, slightly shorter than apical tooth, orientation variable; with well-differentiated long whip-lash seta in middle of gonostylus. Tegmen wider than long, truncate apically, curved basolaterally, weakly sclerotized, with small area of aedeagal teeth. Aedeagal apodeme rather short.

BIN. Unknown.

Discussion. Lycoriella barkalovi sp. n. is very similar to L. lundstromi ( Frey, 1948) : Both species have the eye bridge with two or three rows of facets, a large, basally bow-formed, distinctly demarcated fore tibial organ, lack the intergonocoxal lobe and have a very narrow gonostylus with a few megasetae (spines) latero-medially. In Lycoriella barkalovi the wing is much narrower due to the reduced anal lobe, bM is longer than r-m, coxae and legs are darker brown, the 2 nd and 3 rd palpal segments are subequal in length and the antennal flagellomeres have only some short sensilla. The medial margin and the membraneous area of the gonocoxa have a strikingly short and dense setosity. Furthermore, L. barkalovi has only three or four short and strong megasetae (spines) in the apical half of the gonostylus, the megasetae are all evenly directed basad, the apex of gonostylus is richly setose and the apical part of the gonostylus more impressed and appearing much narrower than the basal part. By comparison, in L. lundstromi the wing is broad with a well-developed anal lobe, bM and r-m are subequal in length, coxae and legs are yellowish (at least coxae yellow), the medial margin and the membraneous area of gonocoxa have only a few weak setae, antennal flagellomeres have long, strongly curved and brownish setae (the vestiture of flagellomeres appears distinctly uneven; the 2 nd segment of maxillary palpus short and the 3 rd segment distinctly longer; the gonostylus is evenly impressed and narrowed towards apex; the gonostylar apex is less setose with weaker setae; the medial side of the gonostylus has four to six megasetae, one to three of which are shorter and located near the base of the apical tooth and three to five are longer, in the apical half of the gonostylus (often two megasetae on the middle of the gonostylus are directed towards each other and may cross).

Etymology. The species is named after the Russian dipterist A.V. Barkalov (Novosibirsk), who collected the type specimens.

Figures

FIGURE 1. Hypopygium, ventral. A. Lycoriella ampla sp. n. (holotype). B. L. barkalovi sp. n. (holotype). Scale 0.1 mm.

FIGURE 3. Gonostylus, ventral. A. Lycoriella ampla sp. n. (holotype). B. L. barkalovi sp. n. C. L. canningsi sp. n. (holotype). D. L. excavata sp. n. (holotype). Scale 0.1 mm.