Boletina nuortti Salmela

Salmela, Jukka, Suuronen, Anna & Kaunisto, Kari M, 2016, New and poorly known Holarctic species of Boletina Staeger, 1840 (Diptera, Mycetophilidae), Biodiversity Data Journal 4, pp. 7218-7218 : 7218

Boletina nuortti Salmela sp. n.

Materials

Type status: Holotype. Occurrence: catalogNumber: DIPT-JS-2015-0074 ; recordedBy: J. Salmela; individualCount: 1; sex: male; Location: country: Finland; stateProvince: Lapponia kemensis pars orientalis; verbatimLocality: Savukoski, Hannu Ollin vaara; verbatimLatitude: 67.8439; verbatimLongitude: 29.4685; verbatimCoordinateSystem: decimal degrees; verbatimSRS: WGS84; Event: samplingProtocol: Malaise trap; eventDate: 2013-8-7 /9-19; habitat: old-growth boreal forest, dominated by pine and birch; Record Level: institutionCode: ZMUT Type status: Paratype. Occurrence: catalogNumber: DIPT-JS-2015-0159 ; recordedBy: J. Salmela; individualCount: 1; sex: male; Location: country: Finland; stateProvince: Lapponia kemensis pars orientalis; verbatimLocality: Savukoski, Hannu Ollin vaara; verbatimLatitude: 67.8439; verbatimLongitude: 29.4685; verbatimCoordinateSystem: decimal degrees; verbatimSRS: WGS84; Event: samplingProtocol: Malaise trap; eventDate: 2013-8-7 /9-19; habitat: old-growth boreal forest, dominated by pine and birch; Record Level: institutionCode: JES

Description

Head dark brown, mouthparts brown and palpomeres brown. Scape and pedicel dark-brown, flagellomeres brown. Scutum brown, rather densely covered by light setae. Pleura brown, mediotergite, laterotergite, anepimeron, anepisternum and preepisternum glabrous. Coxae, femora and tibiae yellow, trochanters infuscated, tarsomeres light-brown, claws black. Wing length 3.4 mm. Sc1, Sc2, Rs, ta, tb, CuA and M-stem bare, apical halves of M1, M2, CuA1 and CuA2 setose on ventral surface. Sc1 ending in costa before Rs. Costa extending beyond tip of R5 to approximately 1/3 of the distance between R5 and M1. Halteres pale. Abdominal tergites and sternites brown, bearing dark hairs. 9th tergite brown, covered by brownish setae. Cercus ca. 1.75 times wider than long, with ca. four irregular combs (i.e. rows of dark-brown, equally long stout setae), total number of setae ca. 50-60 (Fig. 9b). Sternal submedian appendages of gonocoxites apically rounded, short and separated by a Y-shaped cleft (Fig. 9a). Gonostylus appearing unibranched, but is divided on inner and outer branches (Fig. 10a, b). Outer branch rather inconspicuous, bearing thin and rather short mesal hairs. Inner branch short, mostly glabrous, with a few small subapical setae, two or three black apical spines and a longer hyaline seta. Aedeagal complex rather short and wide (Fig. 10c, d, e). Parameres monochromatic, short and stout, tapering apically, their apices not exceeding tip of aedeagus (Fig. 10d). Parameral apodemes very wide in lateral view (Fig. 10e). Ejaculatory apodeme consisting of two short and wide basal lobes. Aedeagus with short ventrodistal sclerites, apex of aedeagus down-curved, coated by a hyaline membrane (Fig. 10c, e).

Diagnosis

A medium-sized Boletina species similar to B. silvatica Dziedzicki, amongst other species. Apices of the sternal submedian appendages are small, rounded and separated by a Y-shaped cleft. The new species is lacking dorsal projections on the gonostylus, as typical for species such as B. silvatica , B. subtriangularis Polevoi & Hedmark and B. triangularis Polevoi. Parameres of the new species are also distinctly shorter than those of the three above mentioned species. Wings unpatterned.

Etymology

The name of the new species is derived from the River Nuortti, a large tributary of the River Tuuloma. Nuortti is derived from north Sami word (nuorti), meaning east; the River Nuortti flows in a NE direction from Finland to Russia. The name of the new species is a noun in apposition.

Distribution

European, so far only known from Törmäoja conservation area, eastern Finnish Lapland.

Ecology

The type locality is a birch dominated boreal forest, bilberry and cowberry ( Vaccinium vitis-idaea ) on the ground layer.

Taxon discussion

The new species is reminiscent of B. silvatica and related species, especially the shape of the aedeagus which indicates an affinity to B. nuortti sp.n. within this species group. However, species related to B. silvatica have a very deep sternal cleft of gonocoxites, whereas the cleft in B. nuortti sp.n. is not exceeding the half length of the gonocoxites. In addition, B. silvatica and related species possess a dorsal projection on gonostylus, a character absent on B. nuortti sp.n. Thirdly, parameres of the new species are relatively short; parameres of B. silvatica and related species greatly exceed the length of aedeagus (see e.g. Polevoi and Hedmark 2004).