Lycoriella lundstromi ( Frey, 1948 )

Babytskiy, A. I. & Bezsmertna, O. O., 2021, New Records Of Sciarid Species (Diptera, Sciaridae) From Ukraine. Iii, Zoodiversity 55 (6), pp. 493-504 : 498-499

Lycoriella lundstromi ( Frey, 1948) ( figs 9–13 )

M a t e r i a l e x a m i n e d. Ukraine, Volyn Region: outskirts of Klubochyn, Tsumanska Puscha National Nature Park, 50.96447° N, 25.77727° E, ca. 215 m a. s. l., hornbeam forest with admixture of Betula pendula Roth. and three trees of Betula obscura А. Kotula , sweeping, 27.06.2017, 2 Ơ (A. Babytskiy) (No. 201-2, Ukr- BIN-795898-9); Ukraine, Volyn Region: outskirts of Klubochyn, Tsumanska Puscha National Nature Park, 50.96230° N, 25.83071° E, ca. 205 m a. s. l., hornbeam-oak forest, sweeping, 27.06.2017, 3 Ơ (A. Babytskiy) (No. 209, 211, 213, UkrBIN-795905, 795907, 795909); Ukraine, Ternopil Region: Nastasiv, 49.41884° N, 25.51873° E, ca. 325 m a. s. l., bank of artificial pond near the vegetable gardens, sweeping above coastal shrubs and weeds, 19.06.2018, 1 Ơ (A. Babytskiy) (No. 632); Ukraine, Ternopil Region: outskirts of Luchka, “Myshkovytska Dacha” tract, 49.40665° N, 25.61123° E, ca. 340 m a. s. l., oak-hornbeam forest near the country side, sweeping, 20.06.2018, 1 Ơ (A. Babytskiy) (No. 634).

Distribution: Czech Republic, Estonia, Finland, France (mainland), Germany, Hungary, Italy (mainland), Luxembourg, Romania, Russia (Southern and Western Siberia), Slovakia, Spain (mainland), Sweden, Switzerland, Ukraine (new record), United Kingdom ( Gerbachevskaja-Pavluchenko, 1986; Mohrig et al., 2001 [as L. subterranea ]; Menzel, 1998; Komarov, 2011; Heller & Weber, 2013; Heller & Menzel, 2017; Kolcsár & Heller, 2019; Menzel et al., 2020; this study).

Diagnosis. Males reach 1.5–1.7 mm in length. Head. Compound eyes sparsely haired or almost bare. Eye bridge consists of 2–4 (2 in Menzel & Mohrig, 2000, 3 in Tuomikoski, 1960 and 4 in Frey, 1948) rows of ommatidia. Maxillary palps yellowish, 3 segmented, basal palpomere with brown sensory pit( fig.13 ).Flagellum of male imago is slim, 1.45 mm in length, middle flagellomeres about three times as long as wide. The base of the first flagellomere is yellow. Flagellomeres with protruding hairy setae, also the clearly recognizable blunt-tipped sensilla present, they are not much shorter than the ordinary setae. The 4 th flagellomere is 2.5 times as long as wide, the neck 1 / 6 of flagellomere body length ( fig. 11 ). Body dark with light bristles. Notum with short yellow bristles. Wing wide, 2.5–2.6 times as long as wide, wing length = 1.5–1.9 mm, wing width = 0.7 mm; c slightly longer than 2 / 3 w; Sc makes a half of R length; R/R 1 = 1.3; R 1 falls into C well before the base of M-fork; x = 1.3–2.0 y, both bare; M-fork as long as the stM; stCuA is about 1 / 2 x; CuA 1 and CuA 2 clearly bent down apically. Haltere with a light stem and dark knob. Legs yellow. Tarsus from the distal half of the metatarsus is dark. Tibial organ of t 1 with patch of bristles and indistinct arcuate emargination ( fig. 12 ). Spurs in t 2 and t 3 short. Hindleg = 0.6 mm; hindtibia = 0.8 mm; hindmetatarsus = 0.3 mm; hindtarsus = 0.7 mm. Hypopygium without basal lobe ( fig. 9 ). The ventral base of gonocoxae with only scattered setae. Gonostylus long and narrow, almost awl-shaped ( fig. 10 ); inner side of the gonostylus with a pair of megasetae in the middle, near the ventral margin and whiplash seta on the basal part ( Frey, 1948; Tuomikoski, 1960).

Lycoriella Frey, 1942 s. l. according to Menzel & Mohrig (2000) included 3 subgenera: Lycoriella Frey, 1942 s. str., Hemineurina Frey, 1942 and Coelostylina Tuomikoski, 1960 .Later, the preoccupied name Coelostylina Tuomikoski was replaced by Stenacanthella Vilkamaa & Menzel , the former subgenera Hemineurina and Stenacanthella (= Coelostylina ) were elevated to genera, and the genus Trichocoelina Vilkamaa & Menzel was established for the members of the Hemineurina species group of L. vitticollis ( Vilkamaa & Menzel, 2019) . Lycoriella s. str. includes 34 species in the Palaearctic which differ from related genera and subgenera by the presence of a dark, deep sensory area on the basal palpomere, absence of spines on t 1, narrow and strongly tapered at apex gonostyles, and the presence of an ascending whiplash seta on the basal part of the gonostyles ( Menzel & Mohrig, 2000). Lycoriella lundstromi differs from related species by lacking a basal lobe on the ventral base of the gonocoxae, and having shorter flagellomeres with a combination of long, curved sensilla and long hairs that stick out clearly. Lycoriella lundstromi is similar to L. subterranea (Märkel, 1844) , but L. lundstromi can be distinguished by the position of lower megasetae on the gonostylus, which are close together and cross over each other, as in figure 9 ( Menzel & Mohrig, 2000).

M o r p h o l o g i c a l n o t e. Males reach 1.5–2.0 mm in length, wing is 1.5–1.9 mm long and 0.6–0.8 mm wide; x and y both bare. Biometric indexes of studied specimens: width/ length of wing = 0.39–0.43; stM/M-fork = 0.92–1.03; R 1 /R = 0.59–0.72; x/y = 0.94–1.74; stCuA/x = 0.31–0.81; c/w = 0.65–0.72. Length of spur/width of tibia: leg 1 = 0.87–1.13, leg 2 = 0.88–1.40; leg 3 = 1.05–1.32. Length of metatarsus/length of tibia: leg 1 = 0.47–0.54, leg 2 = 0.41–0.45, leg 3 = 0.41–0.45. Length of tibia 3/length of thorax is 1.06–1.26.

The eye bridge of our specimens consists of three rows of ommatidia. The ommatidia of the upper row are not as close to each other as the ommatidia of the two lower rows, giving the impression that there are only two rows.

Figures

Figs 9–13. Lycoriella lundstromi, male: 9 — hypopygium, ventral view; 10 — gonostylus, ventral view; 11 — fourth flagellomere, lateral view; 12 — anterior apex of fore tibia (t1) with tibial organ, lateral view; 13 — maxillary palp, lateral view. Scale bars: 0.10 mm.