In the following list the species are arranged alphabetically (by family, genus, and species, respectively). All published records from Slovakia (if available) are listed below the species name, followed by the material examined and the proposed conservation status, as it was also proposed for the Slovak Red Book (in preparation). In the material section, if the specimen(s) was caught in a mountain range (Mts.), its name is given, if it was caught at a river, the name of the river and the nearby municipality are given.
Beraeidae
Beraeamyia hrabei Mayer, 1937
Published records: Mayer (1937, 1938b), Novák and Obr (1966), Chvojka (1993), Chvojka et al. (2020)
Material: Malá Fatra Mts., Valčiansky potok brook, 49°02'51" N, 18°45'47" E, 720 m, 14.04.2021, 1 larva (K), K. Thomková leg., T. Navara det. et coll.
Proposed conservation status: VU
This species, with a distribution in Central and Southeastern Europe (Neu et al. 2018), was described by Mayer (1937) from the Rajčanka and Demänovka basins in central Slovakia. It was later found in northern and eastern Slovakia (Novák and Obr 1966; Chvojka 1993), and more recently in the Strážovské vrchy mountains in central Slovakia (Chvojka et al. 2020). The distribution of the species is well documented in the Czech Republic, where it occurs only in the eastern part of the Morava and Odra river basins (Komzák and Kroča 2018; Komzák and Chvojka 2012). The species occurs in fast-flowing streams at a maximum distance of about 20 km, but usually not more than 10 km, from the source (Komzák and Kroča 2018). The distribution of B. hrabei in Slovakia has so far been insufficiently documented, and the known occurrence is shown in Fig. 1. The species is classified as VU in neighbouring countries (Malicky 2009; Chvojka and Komzák 2017), and is also proposed as VU in the Slovak Red Book (in preparation).
Hydroptilidae
Allotrichia pallicornis (Eaton, 1873) VU
Published records: Novák and Obr (1966), Chvojka et al. (2020)
Material: Topľa River near Hlinné, 48°57'16" N, 21°35'08" E, 135 m, 26.05.1961, 1 ♀ (S), K. Novák leg., P. Chvojka det., coll. NMPC / Biela Orava River below Lokca, 49°22'52" N, 19°25'58" E, 610 m, 29.06.1992, 1 ♀ (S), P. Chvojka leg. et det., coll. NMPC / Váh and Belá Rivers confluence, Liptovský Hrádok, 49°02'06" N, 19°42'34" E, 627 m, 01.08.2022, 2 ♂, 1 ♀ (L), T. Navara et I. Kokavec leg., T. Navara det. et coll.
Proposed conservation status: VU
It is a common species in the western Palaearctic region (Neu et al. 2018), but is considered rare in Central Europe. It is classified as EN in Austria and the Czech Republic (Malicky 2009; Chvojka and Komzák 2017). Rare records have been reported in Hungary, with several localities known in the north of the country near the border with Slovakia (Nógrádi and Uherkovich 2002). Its distribution in the streams and rivers of Slovakia is still not well known. Only two recent records are known from streams and rivers in Slovakia (Fig. 2), which is why the species is considered VU. The species generally prefers metarhitral-epipotamal habitats (Graf et al. 2008) and has been found to thrive in unpolluted and nutrient-poor river sites (Urbanič 2006). Dohet et al. (2008) classified it as an indicator species for large lowland streams in Luxembourg.
Leptoceridae
Adicella balcanica Botosaneanu and Novák, 1965
Published records: Chvojka et al. (2016)
Material: Malé Karpaty Mts., Neštich, 48°15'51" N, 17°11'29" E, 268 m, 28.06.2020, 1 ♂ (S), T. Navara leg. et coll., P. Chvojka det. / Malé Karpaty Mts., Krkavec, 48°16'38" N, 17°12'33" E, 235 m, 18.06.2021, 1 ♂ (S), 04.07.2022, 1 ♂ (S) / Malé Karpaty Mts., Stupavský potok brook 48°15'09" N, 17°06'49" E, 274 m, 23.06.2023, 1 ♂ (S), all T. Navara leg., det. et coll.
Proposed conservation status: DD
The species was described from the former Yugoslavia and Bulgaria (Botosaneanu and Novák 1965). It occurs mainly in the Balkans, reaching northeastern Italy (Ćukušić et al. 2017; Neu et al. 2018). Closest to Slovakia, only a single specimen was found in western Hungary, but the occurrence was not confirmed in later surveys (Nógrádi 2001). Similarly, the first Slovakian record was based on a single specimen from central Slovakia, but the species was not found in subsequent visits (Chvojka et al. 2016).
A. balcanica is known to prefer eucrenal to epirhithral habitats, which are typical for Balkan populations (Graf et al. 2008; Kumanski 1988). Ćukušić et al. (2017) found the species in Croatia in the Krupa karst area with underground springs. In Hungary and Slovakia, A. balcanica was recorded from a stream in the Köszeg Mountains (Nógrádi 1988) and the Nitrica River (Chvojka et al. 2016). New Slovakian records were made in second- and third-order forest epirhithral streams in the Little Carpathians (Fig. 3). These results confirm the widening of the distribution of A. balcanica to Central Europe. Further research on its distribution and habitat preferences in Slovakia should be carried out.
Adicella syriaca Ulmer, 1907
Published records: Navara et al. (2020a, b, 2021)
Material: Šulianske rameno, Dunajské ostrovy NNR, 47°56'13" N, 17°26'42" E, 119 m, 28.10.2019, 30 larvae (K) / Bodícke rameno, Danube inland delta, 47°53'08" N, 17°28'12" E, 116 m, 28.10.2019, 1 larva (K) / Danube, Gabčíkovo, 47°51'41" N, 17°32'02" E, 111 m, 16.04.2020, 1 larva (K) / Veľké Leváre, Rudava River, 48°29'09" N, 16°59'41" E, 151 m, 20.08.2020, 1 ♂ (S) / Vojčianske rameno, Danube inland delta, 47°57'35" N, 17°22'51" E, 119 m, 24.09.2020, 1 larva (K) / Dunajské ostrovy NNR, Danube inland delta, 47°55'47" N, 17°25'30" E, 119 m, 28.10.2021, 4 larvae (K), all T. Navara and I. Kokavec leg., T. Navara det. et coll.
Proposed conservation status: LC
A. syriaca is distributed from the Maghreb through southeastern Europe and the Middle East to the Caucasus (Botosaneanu 1992; Neu et al. 2018). The distribution and spread of this species in Slovakia has been discussed in detail by Navara et al. (2020a, 2021). The most recent record on the Rudava River, a tributary of the Morava River in western Slovakia (Fig. 3), documents the further spread to the northwest. The species has not yet been found in the Morava River and its tributaries in the Czech Republic (Komzák, pers. comm.).
It inhabits crenal and epirhithral areas in the Levant (Botosaneanu 1992), and epipotamal sites are also included in the Balkans (Kumanski 1988). In Slovakia it is known from the Danube and its left tributaries. All larvae were sorted from benthic samples of submerged roots and identified according to Waringer et al. (2017). Based on our data, it can be concluded that the species is common and sometimes abundant in suitable habitats in Slovakia, which is consistent with other parts of its range (cf. Botosaneanu 1992; Kumanski 1988; Nógrádi 2001; Uherkovich and Nógrádi 2005).
Ceraclea riparia (Albarda, 1874)
Published records: Pazsiczky (1914), Mayer (1937), Navara et al. (2021)
Material: Jurský Šúr NNR, biological station, 48°13'41" N, 17°12'21" E, 131 m, 20.07.2020, 1 ♀ (L), T. Navara, I. Kokavec leg. et coll., P. Chvojka det.
Proposed conservation status: CR
The species is found in Europe, the Far East, and China (Neu et al. 2018). The larvae inhabit the epi-metapotamal sections of rivers with lithal substrate (Graf et al. 2008; Leitner and Lorenz 2020). Urbanič et al. (2004) also found larvae on large cobblestones (macrolithal) in a Slovenian river. This species is generally considered rare in Europe, and is even classified as probably extinct in some countries (Chvojka and Komzák 2017; Robert 2016; Szczęsny 2002). It is also rare in Hungary, occurring only sporadically in the Danube River and its tributaries (Nógrádi and Uherkovich 2002). This is probably due to the species' preference for the pristine lithal habitats in the epi- and metapotamal of rivers, which are rare as these river sections are particularly polluted and suffer from habitat degradation (Urbanič et al. 2004; Urbanič 2006; Waringer et al. 2005). Old Slovak records come from the Váh River and its tributary (Pazsiczky 1914; Mayer 1937), recently the species has also been found in the Hron River (Navara et al. 2021). Recently, a female specimen attracted by UV light was collected from the Jurský Šúr Marsh in western Slovakia (Fig. 2). It is likely that the specimen originated from the nearby river system or the more distant Little Danube.
Oecetis testacea (Curtis, 1834)
First record for Slovakia
Material: Šuľany village, Gabčíkovo channel, 47°57'05" N, 17°26'19" E, 117 m, 14.07.2018, 1 ♂ (L), T. Navara leg., det. et coll. / Jurský Šúr NNR, biological station, 48°13'41" N, 17°12'21" E, 134 m, 10.06.2019, 1 ♀ (L); 31.07.2020, 1♂, 1♀ (L) / Čunovo gravel pit, 48°02'22" N, 17°11'12" E, 129 m, 27.07.2022, 3 ♀ (L) / Malý Draždiak gravel pit, 48°06'39" N, 17°07'06" E, 131 m, 18.08.2022, 6 ♀ (L); 01.06.2023, 3 ♂, 8 ♀ (L); 22.06.2023, 22 ♂ (L); 14.08.2023, 32 ♀ (L) / Danube above Dobrohošť village, 47°58'30" N, 17°22'17" E, 120 m, 04.08.2022, 12 ♂, 33 ♀ (L); 19.07.2023, 5 ♂, 7 ♀ (L) / Tarnok Ponds, Pusté Úľany village, 48°14'40" N, 17°31'48" E, 121 m, 15.08.2023, 8 ♂, 5 ♀ (L); all T. Navara leg., det et coll. / Rusovce channel, 48°03'20" N, 17°09'03" E, 130m, 07.05.2022, 3 ♂, 6 ♀ (L) / Starohájsky ostrov, 48°06'30" N, 17°07'37" E, 131m, 18.08.2022, 1 ♂, 1 ♀ (L); all J. Lukáš leg. et coll., T. Navara det. / Čierna voda oxbow lake , 48°11'44" N, 17°24'04" E, 126 m, 11.07.2023, 10 ♀ (L), T. Navara et I. Kokavec leg, T. Navara det. et coll. / Kutlíkova oxbow lake, 48°06'39" N, 17°07'08" E, 131 m, 22.06.2023, 1 ♂, 4 ♀ (L); 19.07.2023, 4 ♂ (L); 14.08.2023, 5 ♀ (L); all B. Endel leg., T. Navara det. et coll.
Proposed conservation status: LC
The species is widespread throughout Europe and the Far East, with records being most common in western and north-western Europe (Graf et al. 2008; Neu et al. 2018; Ivanov 2011). It can be found from the hyporhithral to the metapotamal, including the littoral, and is indifferent to the current type (Schmedtje and Colling 1996). The species has been recorded in neighbouring countries. It was recently recorded in Ukraine (Górecki 2011). In the Czech Republic it was considered relatively rare and endangered (Chvojka and Novák 2001; Chvojka et al. 2005; Chvojka et al. 2009; Chvojka 2008). However, based on new findings, its Red List status was later classified as Near Threatened (Chvojka and Komzák 2017). The species is probably rare in Hungary, with recent data coming only from northern Hungary near the border with Slovakia (Nógrádi and Uherkovich 2002). In Slovakia, records of the species are limited to the western part of the country (Fig. 1). In the Slovak Danube region, the species appears to be common and abundant, with repeated occurrences. The species is therefore considered to be not threatened in Slovakia (LC).
Limnephilidae
Enoicyla reichenbachii (Kolenati, 1848)
First record for Slovakia.
Material: Jurský Šúr NNR, alder forest, 48°13'56" N, 17°12'32" E, 130 m, 05.11.2008, 4 ♂ (M); 21.10.2008, 5 ♂ (M); all Ľ. Vidlička et O. Majzlan leg., T. Navara det. et coll. / Bratislava, Dúbravka, Sitiny, 48°10'16" N, 17°04'02" E, 187 m, 11.10.2021, 1 ♂ (S), J. Samay leg., T. Navara det. et coll. / Jurský Šúr NNR, biological station, 48°13'41" N, 17°12'21" E, 131 m, 21.10.2022, 4 ♂ (M); 05.11.2022, 4 ♂ (M) et 3 ♀ (P); all Ľ. Vidlička, O. Majzlan et J. Samay leg., T. Navara det. et coll.
Proposed conservation status: DD
This is the first record of the only European terrestrial caddisfly genus in Slovakia. The genus Enoicyla comprises three species: E. costae McLachlan, which is found in the Mediterranean, E. pusilla (Burmeister), distributed in western and Central Europe, and E. reichenbachii, distributed from central Italy to Central Europe (Neu et al. 2018). Although the distribution range of the latter two species overlaps, no hybrid specimens have been found in areas of sympatric occurrence (Mey 1983).
The possible occurrence of E. reichenbachii in Slovakia was suggested by Krno (2001) and has now been confirmed. The species was found in an urban forest in Bratislava through sweeping and in the wetlands near Svätý Jur near Bratislava, where males were caught with the Malaise trap and brachypterous females with the pitfall trap. All specimens, except for one, were collected from the Jurský Šúr National Nature Reserve (Fig. 5). This reserve has been a Ramsar site since 1990 and is known for its alder forests and wetlands. According to Mey (1983), Enoicyla larvae inhabit areas near water or permanently wet areas. Maier and Schweizer (2005) identified moist and wet forest areas, such as moist hollows in beech forests, as the habitat of E. reichenbachii. Mey (2014) also reported this species from a deciduous lowland forest with wetlands in Brandenburg. Küttner and Wünschmann (2011) found larvae on the trunks of riparian trees. Although the species is still widespread in Germany, the loss of habitat due to drainage and afforestation with spruce trees could pose a threat to the species. The vulnerability of the species is due to the brachypterous females' inability to cover greater distances (Maier and Schweizer 2005).
Further data is required to determine the distribution and current conservation status of E. reichenbachii in Slovakia.
Grammotaulius nitidus (Müller, 1764)
Published records: Fekete (1926), Mayer (1937, 1938a)
Material: Jurský Šúr NNR, alder forest 48°13'56" N, 17°12'32" E, 130 m, 19.06.2008, 1 ♀ (M), Ľ. Vidlička et O. Majzlan leg., P. Chvojka det. / Tvrdošovce, Panské lúky, 48°05'57" N, 18°02'08" E, 112 m, 31.05.2018, 1♂ (M), Ľ. Vidlička leg., T. Navara det. et coll. / Veľký Grob, Tarnok Ponds, 48°14'32"N, 17°31'48"E], 120 m, 24.09.2022, 1 ♂ (L), T. Navara et B. Endel leg., T. Navara det. et coll.
Proposed conservation status: EN
The species is widespread throughout Europe, except for the northern and southern regions, and extends to western Siberia (Neu et al. 2018). The larvae prefer to inhabit stagnant waters with macrophytes at lower altitudes, as noted by Graf et al. (2008), and can be found in forest ponds, including temporary pools, mesotrophic and eutrophic lakes, and oxbow arms with macrophytes, according to Czachorowski (1998).
G. nitidus may be considered a species of conservation importance in Central Europe. In Austria, there are only old data (Malicky 2009) and the species is considered extinct (Graf et al. 2017). In the Czech Republic, the species is classified as EN (Chvojka and Komzák 2017) with more recent records only found in southern Moravia (Sedlák 1999). In Hungary, the species is more commonly found in the Great Hungarian Plain (Nógrádi and Uherkovich 2002). It is categorized as 'presumably vulnerable', meaning that although there are strong populations, they may decline due to habitat degradation (Nógrádi and Uherkovich 1999).
Specific management measures for this species are currently unknown, as larval records are rare and most records have been made in adults (Koese and Kalkman 2008). Hohmann (2007) highlighted the difficulties in obtaining larvae. For instance, the species became scarce in Britain due to the loss of habitat caused by fen drainage, and there are no repeated records at sites from the latter half of the 20th century. The species has been classified as NT. However, there is still insufficient knowledge about larval requirements and habitat suitability (Wallace 2016).
The recent discoveries in western Slovakia originate from three distinct sites (Fig. 4), representing a rediscovery after approximately 80 years. The records come from ponds, marshes and nature reserves in the Danubian Lowland, which could provide suitable habitat for the population. It is also possible that similar habitats in the Eastern Slovakian Lowland (part of the Great Hungarian Plain) could support the species.
Limnephilus fuscicornis Rambur, 1842
Published records: Pazsiczky (1914); Husárová (1961) (unconfirmed larval records)
Material: Tešmak, Tešmak Swamp, 48°03'40" N, 18°59'14" E, 127 m, 14.05.2022, 2 ♂, 3♀, (M), J. Samay leg., T. Navara det. et coll. / Benice village, NNR Turiec River, 48°59'38'' N, 18°52'28'', 420 m, 26.05.2022, 1 ♂ (S), T. Navara leg., det. et coll.
Proposed conservation status: LC
This limnophilous species inhabits the littoral, epi- and metapotamal (Graf et al. 2008). It is distributed in Europe, with the exception of the southern parts, and in Siberia (Ivanov 2011, Neu et al. 2018). Data on the current distribution in Slovakia are lacking, there are only old data from the Váh River basin in northwestern Slovakia from the beginning of the 20th century (Pazsiczky 1914) and an unconfirmed larval record from southern Slovakia (Husárová 1961). In the neighbouring Czech Republic and Austria, L. fuscicornis is widespread and not classified as a threatened species (Chvojka and Komzák 2017; Malicky 2009), while it is considered rare in Hungary (Nógrádi and Uherkovich 2002; Móra et al. 2006).
New records were made from the Turiec River in central Slovakia and on the Slovak-Hungarian border in the Tešmak Swamp on the right bank of the Ipeľ River (Fig. 5), which was most likely the larval habitat. We assume that the lack of recent data from Slovakia is due to insufficient survey of suitable habitats rather than the absence of the species itself.
Limnephilus incisus Curtis, 1834
Published records: Bulánková et al. (2000) (unconfirmed larval record)
Material: Tarnok Ponds, Pusté Úľany village, 48°14'40" N, 17°31'48" E, 121 m, 15.08.2023, 1 ♂ (L), T. Navara et I. Kokavec leg., T. Navara det. et coll.
Proposed conservation status: DD
This species is found exclusively in stagnant waters and in the littoral zone, according to Graf et al. (2008). O'Connor (2015) reports its presence in marshes with emergent vegetation. In Slovakia, it has only been found in temporary ponds in the Moravia floodplain, based on the collection of larvae as reported by Bulánková et al. (2000). However, these records did not include the voucher specimen. According to the identification keys used at that time (Sedlák 1980; Waringer and Graf 1997), it was not possible to reliably distinguish the larva. Therefore, we consider this record unconfirmed. The new record was made in the Tarnok Ponds (western Slovakia, Danubian Lowland) (Fig. 2). The ponds consist of several water bodies and are surrounded by periodic or permanent bogs. L. incisus is widespread in Hungary (Nógrádi and Uherkovich 2002), so further records in suitable habitats in southern Slovakia can be expected. The species was also previously confirmed in the Czech Republic (Bohemia and Moravia regions) (Chvojka and Novák 2001), but is categorised as VU there due to its rare occurrence (Chvojka and Komzák 2017). The species is classified as Near Threatened in Germany according to Robert (2016). Nevertheless, there are many documented records of the species in the UK, Benelux and Denmark (Neu et al. 2018). Further data from Slovakia are not available and a further study would be necessary to assess the conservation status of the species.
Phryganeidae
Hagenella clathrata (Kolenati, 1848)
Published records: Lukáš and Chvojka (2011)
Material: Spišská Belá, Belianske lúky NNR 49°12'43" N, 20°22'54" E, 670 m, 12.06.2022, 1 ♂ (S), B. Endel et T. Navara leg. et coll., T. Navara det.
Proposed conservation status: EN
Hagenella clathrata is a species found in Europe that typically inhabits bogs in lowland, highland, and submontane zones (Buczyńska et al. 2012). Larval habitats include various types of bogs, such as those overgrown with Sphagnum mosses (Buczyńska et al. 2012; van Kleef et al. 2012) or small pools between Molinia tussocks in the UK (Wallace 2016). The loss of bog habitats across Europe due to peat extraction in the 20th century led to the decline of this species, which is one of the most threatened caddisfly species in Europe and is very rare (Czachorowski and Moroz 2007; Buczyńska et al. 2012). The dispersal ability of the species is low and the adults remain in the vicinity of the breeding sites, which makes the species even more endangered. H. clathrata is classified as an endangered species in Central Europe (Buczyńska et al. 2012; Chvojka and Komzák 2017; Malicky 2009; Robert 2016). In Slovakia, the species was first recorded in the Borská nížina Lowland (Lukáš and Chvojka 2011). The new record comes from the fens in the Tatra foothills (Fig. 5). Further efforts are required to map the distribution of the species in Slovakia. The conservation of peatlands has the potential to positively impact this species. However, additional monitoring is necessary.
Ptilocolepidae
Ptilocolepus granulatus (Pictet, 1834)
First documented occurrence in Slovakia
Material: Reľov-Hágy, brook, 49°18'21" N, 20°22'05" E, 675 m, 12.07.1967, 1 ♀ (S), K. Novák leg. et det., coll. NMPC / Považský Inovec Mts., Selecký potok, brook source 48°45'22" N, 18°01'40" E, 880 m, 14.06.2022, 1 ♂, 1 ♀ (S) / Považský Inovec Mts., Jarabina stream, spring, 48°46'27" N, 18°03'04" E, 870 m, 14.06.2022, 1 ♂ (S) / Považský Inovec Mts., spring above Livina stream, 48°46'06" N, 18°02'24" E, 950 m, 14.06.2022, 4 ♂ (S) / Považský Inovec Mts., Inovec spring area, 48°46'16" N, 18°02'50" E, 910 m, 14.06.2022, 1 ♂ (S), all J. Lukáš leg., T. Navara det. et coll. / Považský Inovec Mts., Železnica stream spring area, 48°41'50" N, 18°00'28" E, 540 m, 12.06.2023, 1 ♂ (S), T. Navara leg., det. et coll. / Považský Inovec Mts., Železnica stream spring area, 48°42'21" N, 18°00'16" E, 630 m, 12.06.2023, 3 ♂ (S) / Považský Inovec Mts., spring brook at Chotina stream, 48°44'49" N, 18°00'32" E, 795 m, 14.06.2023, 2 ♂, 1 ♀ (S), all P. Chvojka leg. et det., coll. NMPC.
Proposed conservation status: DD
Ptilocolepus granulatus is a cold stenothermic species that prefers living in eucrenal and hypocrenal habitats (Graf et al. 2008). Nógrádi and Uherkovich (2002) noted that the species is hygropetric. Larvae of this species are found in growths of Fontinalis spp. and Marchantiophyta (liverworts) in Central European montane and subalpine regions (Waringer and Graf 2002). Besacier et al. (2019) identified this species as one of the species that could be endangered by climate change.
P. granulatus is widespread in Europe, but mainly occurs in the western part, while it is sporadic in Eastern Europe (Neu et al. 2018). There are only rare records from western Hungary (Nógrádi and Uherkovich 2002) or Belarus (Neu et al. 2018), and its occurrence in Ukraine is doubtful (Szczęsny and Godunko 2008). Krno (2001) listed the occurrence of this species in Slovakia in the checklist, but without providing any details. This article presents the first documented occurrence of the species in Slovakia, found in the Považský Inovec Mountains. Additionally, older data from the Spišská Magura Mountains in northern Slovakia are included (Fig. 5). The current threat status of the species in Slovakia cannot be assessed due to the lack of data.