Boletina kullervoi 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 kullervoi Salmela sp. n.

Materials

Type status: Holotype. Occurrence: catalogNumber: MYCE-JS-2013-0148 ; recordedBy: J. Salmela; individualCount: 1; sex: male; Location: country: Finland; stateProvince: Lapponia kemensis pars orientalis; verbatimLocality: Savukoski, Törmäoja; verbatimLatitude: 67.8468; verbatimLongitude: 29.4724; verbatimCoordinateSystem: decimal degrees; verbatimSRS: WGS84; Event: samplingProtocol: Malaise trap; eventDate: 2012-8-16 /9-18; habitat: spring, young deciduous forest; Record Level: institutionCode: ZMUT Type status: Paratype. Occurrence: catalogNumber: DIPT-JS-2014-0109 ; recordedBy: J. Salmela; individualCount: 1; sex: male; Location: country: Finland; stateProvince: Regio kuusamoensis; verbatimLocality: Salla, Värriö Strict Nature Reserve, Kuntasjoki; verbatimLatitude: 67.7494; verbatimLongitude: 29.6168; verbatimCoordinateSystem: decimal degrees; verbatimSRS: WGS84; Event: samplingProtocol: Malaise trap; eventDate: 2013-7-29 /9-19; habitat: headwater stream, old-growth boreal forest; Record Level: institutionCode: JES Type status: Paratype. Occurrence: catalogNumber: DIPT-JS-2015-0341 ; recordedBy: J. Salmela; individualCount: 1; sex: male; Location: country: Finland; stateProvince: Lapponia kemensis pars orientalis; verbatimLocality: Savukoski, Törmäoja; verbatimLatitude: 67.8468; verbatimLongitude: 29.4724; verbatimCoordinateSystem: decimal degrees; verbatimSRS: WGS84; Event: samplingProtocol: Malaise trap; eventDate: 2012-8-16 /9-18; habitat: spring, young deciduous forest; Record Level: institutionCode: JES

Description

Head black, mouthparts dark-brown (Fig. 5). Palpomeres 1-3 dark-brown, 4-5 lighter, but apex of palpomere 5 darkened. Scape, pedicel and flagellomeres dark-brown, except base of 1st flagellomere light brown (see Table 1). Scutum dark-brown, with scattered light setae. Pleura dark brown, mediotergite, laterotergite, anepimeron, anepisternum and preepisternum glabrous. Fore and mid coxae, all femora and tibiae yellow, trochanters black, tarsomeres brown, claws black; basal half of hind coxa dark brown. Wing length 4.8 mm. Sc1, Sc2, Rs, ta, tb and M-stem bare, M1, M2, CuA1, CuA2 and stem of CuA setose on ventral surface. Sc1 ending in costa little beyond Rs. Costa extending beyond tip of R5 only slightly (Fig. 5a). Halteres pale yellow. Abdominal tergites and sternites brown, bearing light hairs. 9th tergite dark-brown. Cercus ca. 1.2 times wider than long, with four more or less regular combs (i.e. rows of dark-brown, stout setae): proximal row with 5, second row with 14-15, third row 8-11 and distal row with 11-13 setae; setae of distal row a little longer than setae of proximal row (Fig. 6b). Apices of sternal submedian appendages of gonocoxites club-shaped, rounded (Fig. 6d, e, see Notes below). Inner branch of gonostylus rather long and narrow, bearing a black apical spine and a longer hyaline seta (Fig. 6c). Parameres short and straight (Fig. 6d, e, f). Parameral apodemes with lateral lobes (Fig. 6d). Aedeagus narrow, its apex curved (Fig. 6f). Ejaculatory apodeme with basal projection and paired ventrodistal sclerites.

Diagnosis

Medium-sized Boletina which is externally similar to B. borealis Zetterstedt, wings unpatterned. The new species has small, paired ventrodistal sclerites on the aedeagus, whereas B. borealis has larger sclerites. Parameres are short and widely separated, parameral apodemes having distinct lateral lobes.

Etymology

The species is named after Kullervo , the son of Kalervo. Kullervo is a tragic character in Kalevala , the Finnish national epic. Kullervo is also the first symphony composed by Jean Sibelius (1892). The name of the new species is a genitive.

Distribution

European, so far only known from eastern Finnish Lapland.

Ecology

Both collecting sites are pristine boreal forests. The collecting site in Törmäoja was a stream valley with lush vegetation, groundwater seepages and coniferous forest on the valley slopes. At Värriö the habitat was similar with the valley surrounded by sparse pine and spruce forest.

Taxon discussion

The new species appears to be closest to B. borealis and related species, including B. intermedia Lundström and B. birulai Lundström. However, the new species is readily distinguished from these based on differences in male hypopygium. Sternal submedian appendages of B. kullervoi sp.n. are apically club-shaped, but more truncated among B. borealis and other species. Parameres of B. kullervoi sp.n. are short and widely separated, including lateral wing-like lobes on the parameral apodemes. Parameres of B. borealis and other species are longer, having no such lateral projections. Please also see Notes below.

Notes

Boletina kullervoi sp.n. is characterized by the arching apices of the sternal submedian appendages of the gonocoxites. In ventral view the sternal submedian appendages appear to be truncated and slightly oblique, but in reality the apices are club-like, firmly attached to aedeagal complex. If one is trying to remove the aedeagal complex from the hypopygium, apices of sternal submedian appendages remain attached to the aedeagal complex. The ventrodistal sclerites of the ejaculatory apodeme are here termed as paired, because there are short apical and basal projections. However, further morphological study is needed to verify whether these appendages are homologous to similar structures among species such as B. borealis and B. hyperborea sp.n.