Diptera, Muscidae) from Norway with an Update of the Number of the Worldwide Known Species of the Genus
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© Norwegian Journal of Entomology. 1 July 2019 Description of a new species of Thricops Rondani, 1856 (Diptera, Muscidae) from Norway with an update of the number of the worldwide known species of the genus EBERHARD ZIELKE Zielke, E. 2019. Description of a new species of Thricops Rondani, 1856 (Diptera: Muscidae) from Norway with an update of the number of the worldwide known species of the genus. Norwegian Journal of Entomology 66, 39–48. Thricops norwegicus sp. n. is described from Norway and compared to similar species of the genus. With this publication the number of Thricops-species recorded from Norway is raised to twenty, and to thirty-one for the European part of the Palaearctic Region. In total 53 species are known worldwide, they are compiled in a table. The name Thricops bakusanus (Shinonaga, 1971) does not stand for a valid species, as erroneously listed by some websites but is the misspelled name of the valid species Thricops hakusanus (Shinonaga & Kano, 1971). Key words: Diptera, Muscidae, Thricops norwegicus, new species, Norway, Thricops species world- wide. Eberhard Zielke, Institute of Biodiversity and Ecosystem Research, Bulgarian Academy of Sciences, 1 Tsar Osvoboditel Blvd, 1000 Sofia, Bulgaria. E-mail: [email protected] Introduction Material and methods The examination of non-identified specimens Keys to the Muscidae of the Palaearctic Region of the Muscidae collection of the Institute of (Hennig1964) and to the Muscidae of Central Biodiversity and Ecosystem Research (IBER), Europe (Gregor et al. 2002, 2016) were used for Bulgarian Academy of Sciences, Sofia revealed the examination of the material of the muscid a single female specimen of the genus Thricops collection of IBER, and the review on Thricops- Rondani, 1856, collected 1968 in Norway. Due to a species of the world by Savage (2003) was applied combination of taxonomic characteristics hitherto for the identification of the species of this genus. not known from the genus, the specimen could not Standard terminologies as used in the Manual of be assigned to any particular species. Therefore, Central European Muscidae (Gregor et al. 2016) the female is regarded as a representative of a new are also predominantly used for the description. species, which is described below as Thricops External morphological features were examined norwegicus sp. n. Since no comprehensible up- using a ZEISS Stemi 2000-C stereomicroscope, to-date listing of the world-known species of the for illustrations an AxioCam ERc5s camera and genus was found in publicly available sources, for further processing Helicon Focus 6 and Adobe the species of Thricops treated in the literature as Photoshop CS2 have been applied. Body length valid species are compiled in tabular form. was measured in millimeters (mm). 39 Zielke: Description of a new species of Trichops from Norway Description with profrons. Genal depth below lowest eye- margin approximately about equal to width of Thricops norwegicus sp. nov. postpedicel. When viewed from anterior frontal Material examined. Female holotype. The vitta, ocellar tubercle, fronto-orbital plate, face, specimen is on the whole well preserved. The parafacial and gena dull dark and depending on locality label reads “N: Hardangervidda, Viveli- light angle more or less greyish dusted, when Veigdalen, Eidfjord, 23.7.1968, leg. T. Nielsen”. viewed from anterodorsal or more lateral frontal The holotype is located at the entomological vitta velvety dark brown, frontal triangle and collection of IBER, Sofia. ocellar tubercle more or less concolorous with Description. Head. Ground-colour dark, frontal vitta. Antennal segments dark brown; at some points of view greyish dusted. Eyes postpedicel conspicuously short and broadened, virtually bare, few barely visible microscopic almost roundish and barely 1,5 times as long as hairs are present. Shortest distance between eye- broad (Figure 1A) and about 1,7 times as long as margins about 3.4 times the width of postpedicel. pedicel. Arista approximately almost 2,5 times as Width of fronto-orbital plate at level of anterior long as length of postpedicel, longest arista-hairs tip of frontal triangle about twice as broad as about 0.3 times as long as width of postpedicel. diameter of anterior ocellus. Frontal vitta almost Inner vertical setae long and strong, ocellar setae parallel shaped and nearly twice as broad as the almost as long as outer vertical setae, interfrontal distance between outer margins of posterior setae or corresponding scars absent. Fronto- ocelli. Anterior tip of frontal triangle and anterior orbital plate at the anterior half of frons with very orbital seta at about the same level. Parafacial few tiny interstitial hairs and two frontal setae, the almost parallel sided, only very little narrowing anterior one distinctly stronger and about twice as at the lower end, at level of insertion of arista long as the smaller upper seta; the upper part of into postpedicel about twice as broad as diameter frons with one strong proclinate orbital seta and of anterior ocellus. In profile facial edge in line closer to the frontal triangle two well developed FIGURE 1. Lateral view of head of (A) Thricops norwegicus sp. n. (female holotype) with conspicuously short and somewhat bulbous postpedicel (p) and without interfrontal setae; (B) of a female Thricops nigritellus (Zetterstedt, 1838) with short but not conspicuously bulbous postpedicel (p) and crossed interfrontal setae (S). (Bar = 0,5 mm). 40 Norwegian Journal of Entomology 66, 39–48 (2019) FIGURE 2. Dorsal view of thorax of Thricops norwegicus sp. n. (female holotype) predominantly brownish dusted (A) and of the female Thricops nigritellus (Zetterstedt, 1838), silver-grey dusted (B). The insertions of the interfrontal setae at the level of the anterior tip of ocellar triangle (two small white spots) are clearly visible in T. nigritellus, but they are lacking in T. norwegicus. (Bar = 0,5 mm). lateroclinate orbital setae, the upper one equally needle is penetrating the body just at the level long and strong as the proclinate seta, the anterior where usually the last postsutural acrostichals are one somewhat shorter. Vibrissal setae long and inserted the information regarding acrostichals strong, but only slightly longer than the longest is 0 + 0-1(?), the presutural acrostichal hairs are peristomal setae. Genal surface below eyes bare, about equally short in about four irregular rows; lower margin of gena and post-genal and post- two postpronotal setae, the outer seta about 1,5 occipital surface covered with black setulose hair. times as long as the inner one; two notopleural Proboscis short, prementum somewhat bulbous, setae, anterior one longer than posterior seta, brown and depending on point of view slightly notopleuron with very few small hairs at basis shining or matt and dusted, labella about 1,5 times of posterior seta; prealar seta at least as long as as broad as diameter of proboscis. Palpus slender, posterior notopleural seta; two intra-alar setae. brown, somewhat longer than prementum. Prosternum, proepimeral area, anepimeron, Thorax. Ground-colour uniformly brown to meron bare, katepimeron with one or two small dark brown. Mesonotum, scutellum and pleura setulae that are hard to see. Katepisternum with depending on point of view shining brownish or 1+3 katepisternal setae, the upper posterior somewhat brownish-grey dusted (Figure 1 B), setae distinctly stronger than the lower ones. mesonotum without any specific pattern. Anterior Anepisternum at posterior margin with a row spiracle brown; posterior spiracle brownish. of approximately five long but not very strong Mesonotum sparsely haired, the ground hair short setae varying in length and with few interstitial setulose, some parts of pleura with some longer hairs, barely longer than ground-hair. Scutellum hairs. Dorsocentral setae 2 + 3; since the staging with conspicuously long apical and slightly 41 Zielke: Description of a new species of Trichops from Norway shorter lateral setae, basal seta about one third Female genitalia, not examined. as long as lateral seta and preapical seta barely Length of body 4 mm, length of wings 4,3 distinguishable from the longer surrounding hairs; mm. lateral surface with setulae; ventral surface bare. Male: not known. Wing. Membrane greyish hyaline, cross-veins Etymology. The name of the new species and surrounding membrane not infuscate. Tegula norwegicus is an adjective and derives, somewhat and basicosta brown to dark, veins at basis of modified, from Norway, the country, where the fly wing yellowish getting more brownish distally. had been collected. Costal spine distinct, almost as long as cross-vein Diagnosis. The major characteristic of Thricops r-m. Radial node dorsally and ventrally bare. Vein norwegicus sp. n., the absence of interfrontal setae, M1 straight, at distal third of wing almost parallel leads in the keys to Thricops provided by Hennig with vein R4+5. Cross-vein r-m slightly apical of (1964), Gregor et al. (2016) and Savage (2003) to the point where vein R1 enters costa, distal cross- Thricops beckeri (Pokorny, 1893). But the females vein dm-cu almost straight and in a right angle to of T. beckeri are characterized by a conspicuously vein M 1. Anal vein A1 not abbreviated. Calypters slender abdomen, densely greyish dusted thorax whitish transparent with a very weak yellowish and abdomen, katepimeron without setulae, tinge, lower calypter slightly longer than upper yellowish calypters and hind tibia according to calypter. Haltere completely yellow, basis of stem Savage (2003) with two or three anterodorsal more dark yellow. setae, three anteroventrals and two posterodorsals, Legs all dark brown, depending on point of and according to Gregor et al. (2016) with two or view more shining or dusted. Claws and pulvilli three anterodorsals, one to three anteroventrals normally developed but rather short. Posterior and posterodorsals. The female of T. norwegicus, surface of hind coxa with at least two strong however, is marked by slender abdomen but not setulae. Fore femur with complete rows of as slim as in T.