Limnobaris pilistriata, (Stephens, 1831)

Tamutis, Vytautas, Balalaikins, Maksims, Alekseev, Vitalii, Pūtys, Žilvinas & Telnov, Dmitry, 2024, An annotated checklist of supertribe Bariditae Schoenherr, 1836 (Coleoptera, Curculionidae, Conoderinae) in southeastern Baltic region, Ecologica Montenegrina 71, pp. 144-164 : 147-150

= L. pilistriata (Stephens, 1831)

Material examined. LATVIA – Ādaži • Lielais Baltezers , 57°2'38"N, 024°18'46"E; alt. 4 m; 01. VI.1951; leg. Z.S.; 2 spec.; LNDM • Carnikava , 57°8'7"N, 024°16'14"E; alt. 2 m; 20. VI.1969; leg. R.P.; 1 spec.; LNDM • Kadaga , 57°5'20"N, 024°22'17"E, alt. 5 m, 3.VII.2020 ; obs. L. B.; 1 spec. – Augšdaugava • Nature reserve “Ilgas”, 55°41'25"N, 026°46'32"E; alt. 153m; 10. VI.1992; leg. A.Ba.; 1 spec.; DUBC • ibid; 15. V.1993; leg. A.Ba.; 4 spec.; DUBC • ibid; 06.VII.1995; leg. A.Ba. ; 1 spec.; DUBC • ibid; 10. V.1996; leg. R.C.; 1 spec.; DUBC • Lake Žīdu , 55°57'24"N, 026°28'54"E; alt. 98 m; 29.IV.2008; leg. A.Bu. ; Carex spp. stand; 1 spec.; DUBC • Nature reserve “Pilskalnes Siguldina”, 55°58'36"N, 026°15'52"E; alt. 123 m; 29. V.1993; leg. A.Ba.; 1 spec.; DUBC • Daugavpils, Lake Stropu , 55°55'23"N, 026°34'55"E; alt. 114 m; 25-28. V.2007; leg. A.Bu; Carex spp. stand; 2 spec.; DUBC – Cēsis • Gauja National park , 57°19'29"N, 025°13'36"E; alt. 114 m; 01. VI.2016; leg. Ch.F.; 2 spe.; FPC – Dienvidkurzeme • Baidzele , 56°27'58"N, 021°06'13"E; alt. 2 m; 8. V.2018; obs. A. Z.; 1 spec. – Jēkabpils • Rubeņi , 56°8'12"N, 025°59'11"E; alt. 111 m; 12.IV.1998 ; leg. I.L.; 1 spec.; DUBC – Krāslava • Šķeltova , 56°1'37"N, 027°0'43"E; alt. 147 m; 25.II.1995; leg. A.Ba. ; 1 spec.; DUBC – Limbaži • Ainaži , 57°51'48"N, 024°20'56"E; alt. 2 m; 25.06.2004 ; leg. A.K.; 1 spec.; IBULC • Braslava , 57°45'22"N, 025°2'28"E; alt. 77m; 28. VI.2006; leg. D. T.; 1 spec.; TPC – Madona • Nature reserve “Krustkalni”, 56°45'53"N, 026°9'31"E; alt. 95 m; 07.VII.2006 ; leg. A.P.; 1 spec.; DUBC – Ogre • Lake Selēku , 56°52'25"N, 024°28'14"E; alt. 21 m; 13. VI.2012; leg. D. T.; Carex spp. stand; 4 spec.; TPC – Rēzekne • Luznava , 56°22'4"N, 027°17'27"E; alt. 166 m; 29. V.2016; leg. Ch.F.; 2 spec.; FPC – Rīga • Vakarbuļļi, Nature park „Piejūras”, 56°59'56"N, 023°57'35"E; alt. 8 m; 21. V.2020; leg. A.N.; 1 spec.; NPC – Ropaži • Garkalne , 57°3'14"N, 024°22'44"E; alt. 7 m; 23.III.2021 ; obs. L.B.; among the pieces of rotten wood of the stump; 1 spec. • Vangaži , 57°5'31"N, 024°31'56"E; alt. 21 m; 18. V.2019; obs. A.Bal.; 1 spec. – Salaspils • Saulkalne , 56°50'33"N, 024°26'0"E; alt. 23 m; 07. VI.1971; leg. M.Š.; Carex spp. stand; 6 spec.; DUBC – Sigulda • Sigulda , 57°9'22"N, 024°50'29"E; alt. 18 m; 17-24. VI.1969; leg. R.P.; 2 spec.; LNDM – Talsi • “ Gipkas lankas”, 57°35'53"N, 022°36'2"E; alt. 10 m; 25. V.2016; leg. Ch.F.; 1 spec.; FPC • Lielais Pēterezers, Slītere National park , 57°39'15"N, 022°15'42"E; alt. 10 m; 30. V.2007; leg. M.K.; 1 spec.; DUBC • Slītere National park , 57°38'34"N, 022°22'20"E; alt. 26 m; 22. V.2016; leg. Ch.F.; 3 spec.; FPC • Slītere National park, Uši , 57°41'8"N, 022°34'11"E; alt. 12 m; 26. V.2016; leg. Ch.F.; 1 spec.; FPC – Tukums • Bērzciems, Lake Engures nature park, 57°15'53"N, 023°7'57"E; alt. 2 m; 20. VI.2000; leg. A.K.; 1 spec.; IBULC • ibid; 05.VII.2000 ; leg. A.K.; 1 spec.; IBULC • ibid; 14.VIII.2000 ; leg. A.K.; 1 spec.; IBULC • ibid; 22. VI.2001; leg. A.K.; 1 spec.; IBULC • ibid; 10.VII.2001 ; leg. A.K.; 1 spec.; IBULC • ibid; 22. VI.2003; leg. A.K.; 1 spec.; IBULC • ibid; 19. VI.2007; leg. K. V.; 1 spec.; IBULC • Ķemeri National park , 56°57'44"N, 023°28'22"E; alt. 3 m; 25. V.2016; leg. Ch.F.; 4 spec.; FPC • Kemeri National park, Kugrainis , 57°1'44"N, 023°23'22"E; alt. 2 m; 30. V.2016; leg. Ch.F.; 4 spec.; FPC • Kemeri National park, Kugrainis , 57°1'47"N, 023°23'35"E; alt. 2 m; 20. V.2020; leg. A.N.; 1 spec.; NPC – Ventspils • Aizupju dambis, 57°17'53"N, 022°12'4"E; alt. 32 m; 26.05.2017 ; obs. M.I.; 1 spec. • Nature reserve “Ances purvi un meži”, 57°34'4"N, 021°57'51"E; alt. 16 m; 27. VI.2006; leg. A.Ba.; 2 spec.; DUBC . LITHUANIA – Ignalina • Linkmenas , 55°22'6"N, 025°59'28"E; alt. 142 m; 13. VI.2016; leg. R.F.; Carex spp. stand; 3 spec.; KZM, IC-57954, IC – 57955- 1, IC-57955-2 – Kaunas • Braziūkai , 54°54'8"N, 023°29'01"E; alt. 72 m; 19.VII.2019 ; leg. V. T.; from Carex sp. ; 1 spec.; KZM, IC-71505 • Dubravos miškas, 54°51'2"N, 024°4'50"E; alt. 73 m; 16. V.1999; leg. R.F.; 6 spec.; KZM, IC-28312 • Miškas Kamša , 54°54'5"N, 023°48'16"E; alt. 81 m; 15.VII.1978 ; leg. S. R.; 1♀; KZM, IC-71716 • Raudondvaris , 54°56'35"N, 023°47'16"E; alt. 39 m; 20. V.1998; leg. D.Luk.; 1 spec.; KZM, IC-28320 • Šiuliai , 54° 53' 33"N, 023° 31' 12"E; alt. 65 m; 23. V.2023; leg. V. T.; 1 spec.; KZM, IC-71717 • Žiegždriai , 54°53'17"N, 023°5'48"E; alt. 49 m; 30. V.1992; leg. V. T.; erroneously reported as Limnobaris pusio Boheman, 1844 by Tamutis (2003); 1 spec.; KZM, IC-71506 – Kupiškis • Paketuriai , 55°51'5"N, 024°58'5"E; 15. V.1995; obs. R. Pa.; 1 spec. – Molėtai • Malkėstas , 55° 15' 10"N, 025° 29' 44"E; alt. 153 m; 29.05.2016; leg. Ch.F. ; 2 spec.; FPC – Švenčionys • Padubingės ( Purvyno ) pelkė, 55° 1' 47"N, 025° 37' 56"E; alt. 140 m; 23. V.2007; leg. P.I.; 3 ♂; NRC, E000041 • ibid; 10. V.2008; leg. P.I.; 2♂, 1♀ spec.; NRC, E000042 (1-2), E000043 – Ukmergė • Zujai , 55°17'13"N, 024°51'13"E; alt. 56 m; 18. V.1985; leg. G.Š.; 1 spec.; KZM, IC-28310 – Varėna • Lynežeris , 54°3'50"N, 024°33'59"E; alt. 127 m; 03. VI.1993; leg. R.F.; 1 spec.; KZM, IC-28311 • Lynežeris , 54°3'47"N, 024°34'20"E; alt. 128 m; 10.VII.1990 ; leg. G.S.; 2 spec.: KZM • Marcinkonys , 54°3'11"N, 024°24'56"E; alt. 123 m; 15. V.1984; leg. R.F.; 1 spec.; KZM, IC-28309 • Marcinkonys , 54°3'15"N, 024°23'24"E; alt. 118 m; 24. V.1989; leg. G.S.; 2 spec.; KZM • Nature reserve “Čepkeliai”, 54°03'09"N, 024°32'49"E; alt. 132 m; 23. V.1989; leg. G.S.; 2 spec.; KZM • ibid; 28. V.1989; leg. G.S.; 2 spec.; KZM • ibid, 25.VII.1990 ; leg. G.S.; 1 spec.; KZM • ibid; 27. VI.1993; leg. G.S.; 1 spec.; KZM • Stojai , 54°0'40"N, 024°46'8"E; alt. 131 m; 16. V.2008; leg. P.I.; 1 spec.; NRC, E000045 – Vilnius • Kalniškės , 54°50'48"N, 025°10'38"E; alt. 157 m; 19. V.2007; leg. P.I.; 1 spec.; NRC, E000044 – Zarasai • Jasai , 55°46'33"N, 025°52'55"E; 02. VI.2004; leg. P.I.; 3 spec.; NRC, E000039 . KALININGRAD REGION – Bagrationovsk • Ladushkin , 54°34'37"N, 020°12'48"E; alt. 23 m; 23. VI.2021; leg. V.A.; 2 spec; APC • ibid, 26. V.2022; leg. V.A.; 1 spec; APC – Chernyakhovsk • Gremyach‘e , 54°42'9"N, 021°38'57"E; alt. 24 m; 02.VIII.1996 ; leg. V.A.; 1 spec; APC • Chernyakhovsk , 54°38'25"N, 021°52'32"E; alt. 35 m; 10. V.2009; leg. V.A.; 4 spec; APC – Guryevsk • Kaliningrad , 54°45'6"N, 020°28'43"E; alt. 16 m; 17. V.2008; leg. V.A.; 3 spec; APC – Pravdinsk • Zehlau Bog , 54°29'51"N, 020°55'11"E; alt. 31 m; 17. V.1998; leg. V.A.; 2 spec; APC – Svetlogorsk • Svetlogorsk , 54°56'38"N, 020°7'45"E; alt. 50 m; 02. VI.2003; leg. V.A.; 1 spec; APC • Svetlogorsk , 54°56'30"N, 020°8'42"E; alt. 45 m; 06. VI.2004; leg. V.A.; 1 spec; APC – Zelenogradsk • the Curonian Spit , 55°2'31"N, 020°39'8"E; alt. 4 m; 30. V.2003; leg. V.A.; 1 spec; APC .

Identification. Adults of two Western Palaearctic species, L. dolorosa and L. t-album , are characterized by the presence of dense whitish or yellowish squamiform setae on lateral parts of mesoand metathorax, and abdomen ( Prena et al. 2014b). The most reliable distinguishing external character for L. dolorosa is the density of punctures and vestiture on intervening spaces on elytra, which both are much denser compared to L. t-album ( Arnoldi et al. 1965; Smreczyński 1974) ( Figure 1 : A and B). Also, L. dolorosa often has comparatively denser ventrolateral vestiture ( Prena et al. 2014b). The setation of dorsum and the arrangement of white ventrolateral scales are not always reliable diagnostic features due to the high grade of interspecific variation ( Lohse 1983). Pronotum width-length ratio has been previously considered species-specific distinguishing character ( Smreczyński 1974), but our morphometric measurements demonstrate that its importance should not be overestimated. The ratio values as determined for L. dolorosa based on the examined specimens from the study area: 1.145, standard deviation (σ) = 0.023, n = 6 (females); 1.133, σ = 0.046, n = 20 (males) and for L. t-album : 1.185, σ = 0.029, n = 4 (females); 1.16, σ = 0.033, n = 9 (males). External sexual dimorphism is inconspicuous with male rostrum comparatively shorter, thicker, and stronger curved. As stated by Prena et al. (2014b), the most reliable way to distinguish L. dolorosa from L. t-album is by the shape of aedeagus, which is distinctly shorter and wider in L. dolorosa ( Figure 1 : C and D).

Published local records. The species was reported from surroundings of Jugla and Sigulda [Segewold] ( Latvia) by Lindberg (1932), Chernyakhovsk, Gur’evsk, Gvardeysk, Pravdinsk, Zelenogradsk (Kaliningrad Region) ( Alekseev 2010, 2016) without detailed information. The species was considered very rare by previous authors and thought distributed only in the central part of Lithuania ( Pileckis & Monsevičius 1997). Detailed faunistic information was provided on the occurrence of this species in Dienvidkurzemes municipality (former Liepāja district) ( Lackschewitz & Mikutowicz 1939) in Latvia and Alytus ( Pileckis 1968) and Švenčionys ( Ivinskis et al. 2009) districts municipalities in Lithuania.

General distribution. This species is widely distributed throughout the Palaearctic Region, from the British Islands to the Russian Far East ( Legalov 2020; Alonso-Zarazaga et al. 2023). The northern boundary of the distribution range extends northwards to 69°N in Finland ( Rassi et al. 2015); the southern range extent passes through Italy, Croatia, Bulgaria, Turkey, Uzbekistan, northern Mongolia, north-eastern China, and South Korea ( Prena et al. 2014b; Alonso-Zarazaga et al. 2023). Limnobaris dolorosa is widely distributed in the north-eastern Caucasus (Izmailova et al. 2007), however, not yet recorded from Transcaucasia.

Notes on biology. Larvae develop at leaf base area, latter they penetrate rhizome, overwinter, and pupate within host plant in May ( Cawthra 1957; Prena et al. 2014b). Various species of sedges ( Cyperaceae ) are considered suitable for adults and larvae of this species: Carex rostrata ( Cawthra 1957) , C. urticulata ( Prena et al. 2014b) , Cladium mariscus ( Palm 1957) , and Scirpus silvaticus ( Hoffmann 1955) .

Local occurrence and phenology. The species is likely widespread in the study region; however, the records are distributed unevenly. Altogether, in our study it was recorded from 32 administrative units: 16 in Latvia, 10 in Lithuania and 6 in KR ( Figure 2 : A). The adults were collected mainly in damp areas, swamps, marshes and banks of various waterbodies from Carex spp. Maximum number of adults recorded in May, the earliest record: February 25, latest: August14.

Figures

Figure 1. Limnobaris species (Lithuania, KZM): A – dorsal habitus of L. dolorosa, B – dorsal habitus of L. talbum, C – aedeagus of L. dolorosa, D – aedeagus of L. t-album. Scale bar - 1 mm.

Figure 2. Maps of southeastern Baltic region with a grid of administrative units and shaded units with available records of Limnobaris species. A – L. dolorosa, B – L. t-album.