ACTA ENTOMOLOGICA SLOVENICA LJUBLJANA, JUNIJ 2019 Vol. 27, st. 1: 59-64 contribution to the knowledge of the caddissfly (insecta: trichoptera) fauna of the drenica river in Kosovo Halil Ibrahimi1, Ibadete Spahija1, Astrit Bilalli2 and Ruzhdi Kugi3* department of Biology, Faculty of Mathematical and Natural Sciences, University of Prishtina "Hasan Prishtina", "Mother Teresa" p.n., 10 000 Prishtina, Republic of Kosovo 2 University of Peja "Haxhi Zeka", Faculty of Agribusiness, 10000 Peje, Republic of Kosovo 3 Faculty of Education, University of Prishtina "Hasan Prishtina", "Mother Theresa" street p.n., 10000 Prishtina, Republic of Kosovo * Corresponding author ruzhdi.a.kuqi@hotmail.com Abstract - Adult caddisflies were collected with ultraviolet light trap at five sampling stations belonging to the Drenica River basin in Kosovo from June to October 2017. During this investigation 22 species belonging to 9 families were sampled. The highest number of species belongs to the Rhyacophilidae, Hydropsychidae and Leptoceridae families. The species of the Limnephilidae family, Limnephilus fuscicornis is reported for the first time from Kosovo and was found only at station S5 Grabovc. This study is a contribution to the knowledge of the caddisfly fauna of the central part of Kosovo which is relatively poorly investigated. Key words: Freshwater diversity, Black Sea Basin, Balkan, Limnephilus fuscicornis. Izvleček - PRISPEVEK K POZNAVANJU FAVNE MLADOLETNIC (INSECTA: TRICHOPTERA) REKE DRENICE NA KOSOVU Odrasle mladoletnice smo zbirali s pastmi z ultravijolično svetlobo na petih vzorčnih mestih v porečju reke Drenice na Kosovu od junija do oktobra leta 2017. Med raziskavo smo našli 22 vrst, ki pripadajo 9 družinam. Največ vrst pripada družinam Rhyacophilidae, Hydropsychidae in Leptoceridae. Vrsta iz družine Limnephilidae, Limnephilus fuscicornis, je prvič zabeležena na Kosovu in je bila naj- 59 Acta entomologica slovenica, 27 (1), 2019 dena le na postaji S5 Grabovc. Raziskava je prispevek k poznavanju favne mladoletnic osrednjega dela Kosova, ki je razmeroma slabo raziskana. Ključne besede: sladkovodna raznovrstnost, črnomorsko porečje, Balkan, Lim-nephilus fuscicornis. Introduction Until recently Kosovo has been one of the least investigated areas in the Balkan Peninsula in terms of caddisfly fauna with only few historical records. During the last decade several large scale investigations have been carried out, increasing thus significantly the number of recorded species (e.g. Gashi et al. 2015, Gashi and Ibrahimi 2008, Ibrahimi et al. 2012, 2013, 2014, 2015a, 2015b, 2015c, 2015d, 2016a, 2016b, 2017, Ibrahimi and Gashi 2008, Olah et al. 2014, 2015). However, there are still poorly investigated areas inside Kosovo, mostly high altitude mountains and central part of the country. Freshwater ecosystems in Kosovo belong to the drainage basins of three seas: the Black Sea, the Adriatic Sea and the Aegean Sea. This investigation is concentrated in one of the areas of the central part of Kosovo, namely Drenica River and its tributaries, from where only few caddisfly records were previously known. Beside Drenica River, other important rivers belonging to the Black Sea drainage basin are Iber, Sitnica, Llapi and Morava e Binges. Except Llap and Sitnica rivers, the rest of the rivers of this basin, including the Drenica River are poorly investigated for aquatic insects. The goal of this paper was to contribute to the inventory of the caddisfly fauna of the Republic of Kosovo and to expand the knowledge about the composition of the caddisfly fauna of the Drenica River and its tributaries. Material and methods Specimens of adult caddisflies were collected with ultraviolet light trap during the period June - October 2017. Ultraviolet light was placed above the white pan of 60 cm in diameter filled with 10 cm of water with a few drops of detergent. The ultraviolet light trap was placed on stream bank and operated for approximately six hours starting from the dusk. Collected samples were preserved in 80 % ethanol. The specimens were identified under a stereomicroscope with determination keys from Malicky (2004) and Kumanski (1985, 1988). The collection is deposited at the Laboratory of Zoology of the Faculty of Natural and Mathematical Sciences, University of prishtina, Kosovo. Caddisfly specimens were collected at five selected sampling stations of the Drenica River and its tributaries (Table 1). Four sampling stations are located in tributaries of this river and one in the main flow of the river. Drenica River is a left tributary of the Sitnica River with approximately 50 km length. The spring area of the river is in the Carraleva Mountain. The territory of the Drenas Munic- 60 Halil Ibrahimi, Ibadete Spahija, Astrit Vilalli Ruzhdi Kufi: Contribution to the knowledge of the caddissfly (Insecta: Trichoptera) ipality where this river is located is surrounded by the mountains Berisha, Qyqavica, Kosmaq, Golesh and Blinaje. Data about sampling stations are presented in Table 1. Table 1. Details about the five sampling stations in the Drenica River and tributaries Sampling stations Longitude N Latitude E Altitude S1 Kishnareke 1 42°32'28.35" 20°52'9.28" 778m S2 Kishnareke 2 42°32'54.74" 20°52'25.45" 720m S3 Nekovc 42°31'52.76" 20°53'4.36" 714m S4 Baice 42°32'16.73" 20°54'25.74" 627m S5 Grabovc 42°40'27.03" 20°57'40.40" 564m Results and Discussion During this investigation twenty-two taxa were found in total (Table 2), belonging to the following families: Rhyacophilidae, Philopotamidae, Hydropsy-chidae, Psychomyiidae, Polycentropodidae, Limnephilidae, Leptoceridae, Odon-toceridae and Goeridae. The highest number of the found species is registered within the families Rhyacophilidae, Hydropsychidae and Leptoceridae (four species each). Families Psychomyiidae, Odontoceridae and Goeridae are represented with only one species each. The highest number of the sampled specimens belongs to the females of the genus Hydropsyche and species Rhyacophila fasciata Hagen, 1859. Five species during this investigation were sampled as singletons: Tinodes pal-lidulus McLachlan, 1878, Glyphotaulius pellucidus Curtis, 1834, Athripsodes bilin-eatus Linnaeus, 1758, A. cinereus Retzius, 1783 and Silo graellsi Pictet, 1865. Three species of the Rhyacophilidae found during this investigation are widespread in Kosovo and the Balkan Peninsula while the fourth species, Rhyacophila fischeri Hagen, 1859 is considerably rare in Kosovo and in the region and mostly associated with upstream areas of mountainous streams and rivers. Rhyacophila fasciata was found in three out of the five sampling stations during this investigation, while the other three species of this family were found only in sampling station S1. Philopotamus montanus Donovan, 1813 and Wormaldia occipitalis Pictet, 1834 of the Philopotamidae family which were found in one sampling station each belong to the group of the most widespread species in Kosovo and Balkans, associated with almost all upstream courses of rivers and streams, while the third species of this family Wormaldia subnigra McLachlan, 1865 is found in Kosovo only in limited number of areas (Ibrahimi et al., 2012). Until now in Kosovo it was only known from Mirushe and Llap rivers. All species of the Hydropsychidae, Psychomyyidae and Polycentropodidae found during this investigation were also previously found in Kosovo in numerous rivers and streams. Amongst three species of the Limnephilidae found during this investigation the most interesting find is of Limnephilus fuscicornis Rambur, 1842. This species is registered for the first time for Kosovo. During this investigation it 61 Acta entomologica slovenica, 27 (1), 2019 Table 2. The species and associated number of specimens in the five sampling stations Species Sampling stations S1 S2 S3 S4 S5 Total Rhyacophilidae Rhyacophila fasciata Hagen, 1859 7 5 31 43 Rhyacophila fischeri Botosaneanu, 1957 3 3 Rhyacophila polonica McLachlan, 1879 3 3 Rhyacophila tristis Pictet, 1834 2 11 13 Philopotamidae Philopotamus montanus Donovan, 1813 2 2 Wormaldia occipitalis Pictet, 1834 2 2 Wormaldia subnigra McLachlan, 1865 2 2 Hydropsychidae Hydropsyche angustipennis Curtis, 1834 8 2 10 Hydropsyche instabilis Curtis, 1834 5 5 Hydropsycheperisterica Botosaneanu & Marinkovic- Gospodnetic, 1968 8 2 10 Hydropsyche saxonica McLachlan, 1884 4 4 Hydropsyche spp. females 29 6 19 15 12 81 Polycentropodidae Cyrnus trimaculatus Curtis, 1834 4 4 Plectrocnemia conspersa (Curtis, 1834) 3 3 Psychomyiidae Tinodes pallidulus McLachlan, 1878 1 1 Limnephilidae Limnephilus fuscicornis Rambur, 1842 11 11 Micropterna sequax McLachlan, 1875 7 Glyphotaulius pellucidus Retzius, 1783 1 1 Leptoceridae Athripsodes bilineatus Linnaeus, 1758 1 1 Athripsodes cinereus Curtis, 1834 1 1 Mystacides azureus Linnaeus, 1761 3 3 Mystacides niger Linnaeus, 1758 4 4 Odontoceridae Odontocerum albicorne Scopoli, 1763 2 2 Goeridae Silo graellsii Pictet, 1865 1 1 was found only in one sampling station which is located at the main course of the Drenica River (S5). L. fuscicornis is present in most of the European continent but not very widespread in the Balkan Peninsula (Graf et al. 2008). Our finding is apparently the first finding for ecoregion 6. Larvae of this species are mostly associated 62 Halil Ibrahimi, Ibadete Spahija, Astrit Vilalli Ruzhdi Kufi: Contribution to the knowledge of the caddissfly (Insecta: Trichoptera) with macrophytes, mosses, Characeae, living parts of terrestrial plants, coarse and fine particulate matter (Graf et al. 2008). They feed mostly as shredders, grazers and predators. The adults belong to the group with long flying period although during our investigation it has been found only during one month. Previously the following species were registered from the Drenica River: Rhya-cophila fasciata, Synagapetus iridipennis McLachlan, 1879, Philopotamus mon-tanus, Wormaldia occipitalis, Hydropsyche emarginata Navas, 1923, Hydropsyche bulbifera McLachlan, 1878, Lype reducta (Hagen, 1868), Cyrnus trimaculatus (Curtis, 1834), Psychomyia pusilla (Fabricius, 1781), Anabolia furcata Brauer, 1857, Glyphotaulius pellucidus, Goera pilosa (Fabricius, 1775), Silo piceus (Brauer, 1857), Adicella syriaca Ulmer, 1907, Athripsodes bilineatus, Ceraclea albimacula (Rambur, 1842), Ceraclea dissimilis (Stephens, 1836), Leptocerus in-terruptus (Fabricius, 1775), Mystacides azureus (Linnaeus, 1761), Mystacides niger (Linnaeus, 1758) and Oecismus monedula (Hagen, 1859) (Ibrahimi et al. 2012). This study is a further contribution to the knowledge of the composition of the caddisfly fauna of the Drenica River. 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