Abstract
Very rare North European water flea Rhynchotalona latens (Sarmaja-Korjonen, Hakojärvi & Korhola, 2000) (Crustacea: Cladocera), found mostly as remains during subfossil studies, was found in North Karelia, Russia. The species inhabits waterlogged Sphagnum mosses at lake margins, but is not present in littoral zones of the lakes. Morphology of thoracic limbs of R. latens was studied for the first time; SEM studies of the species were conducted for the first time. Our data suggests that R. latens is a specialized interstitial moss-dwelling species, only accidentally found in open water, which explains its rarity in samples taken by standard sampling methods. Presence of R. latens subfossil remains in sediments specifically indicate presence of Sphagnum at the lake coast, typical for acid oligotrophic or dystrophiс lakes.
References
Bigler, C., Heiri, O., Krskova, R., Lotter, A.F. & Sturm, M. (2006) Distribution of diatoms, chironomids and cladocera in surface sediments of thirty mountain lakes in south-eastern Switzerland. Aquatic Sciences, 68, 154–171. https://doi.org/10.1007/s00027-006-0813-x
Chiambeng, G. & Dumont, H.J. (1999) New semi-terrestrial chydorids from the tropical rainforest of southwest Cameroon (Africa): Nicsmirnovius camerounensis n.gen. n.sp. and Bryospilus africanus n.sp. (Crustacea: Anomopoda). Hydrobiologia, 391, 259–270.
Frey, D.G. (1980) The non-swimming chydorid Cladocera of wet forests, with descriptions of a new genus and two new species. Internationale Revue der gesamten Hydrobiologie und Hydrographie, 65 (5), 613–641. https://doi.org/10.1002/iroh.19800650502
Ibragimova, A.G. (2020) Taphocenoses of Cladocera (Crustacea: Branchiopoda) in glaciogenic lakes of European part of Russia. Ph.D. thesis, A.N. Severtsov Institute of Ecology and Evolution, Moscow, 179 pp. [http://sev-in.ru/sites/default/files/2020-03/IbragimovaDisser.pdf]
Korhola, A. (1992) The Early Holocene hydrosere in a small acid hill-top basin studied using crustacean sedimentary remains. Journal of Paleolimnology, 7, 1–22. https://doi.org/10.1007/BF00197028
Korovchinsky, N.M., Kotov, A.A., Sinev, A.Y., Neretina, A.N. & Garibian, P.G. (2021) Water fleas (Crustacea: Cladocera) of North Eurasia. Vol. 2. KMK Press, Moscow, 544 pp.
Milan, M., Bigler, C., Tolotti, M. & Szeroczyńska, K. (2017) Effects of long term nutrient and climate variability on subfossil Cladocera in a deep, subalpine lake (Lake Garda, northern Italy). Journal of Paleolimnology, 58, 335–351. https://doi.org/10.1007/s10933-017-9981-z
Nevalainen, L. (2008) Sexual reproduction in chydorid cladocerans (Anomopoda, Chydoridae) in southern Finland; implications for paleolimnology. Publications of the Department of Geology D16. Ph.D thesis, University of Helsinki, Helsinki, 54 pp. [http://ethesis.helsinki.fi/] https://doi.org/10.3176/eco.2008.1.02
Nevalainen, L., Kivilä, E.H., Luoto, T.P., Rantala, M.V. & Van Damme, K. (2019) A hidden species becoming visible: biogeography and ecology of Rhynchotalona latens (Cladocera, Anomopoda, Chydoridae). Hydrobiologia 837, 47–59. https://doi.org/10.1007/s10750-019-3958-z
Nigmatullin, N.M., Nigamatzyanova, G.R., Valieva, E.A. & Frolova, L.A. (2021) Recent Сladocera (Branchiopoda, Crustacea) in the taphocenoses of lakes of the Pechora River delta (Russia). Uchenye Zapiski Kazanskogo Universiteta. Seriya Estestvennye Nauki, 163 (3), 527–537. https://doi.org/10.26907/2542-064X.2021.3.527-537
Røen, U. (1973) Rhynchotalona kistarae sp.n. from South Greenland (Crustacea, Cladocera, Chydoridae, Aloninae). Steenstrupia, 3, 89–92.
Sarmaja-Korjonen, K., Hakojärvi, M. & Korhola, A. (2000) Subfossil remains of an unknown chydorid (Anomopoda: Chydoridae) from Finland. Hydrobiologia, 436, 165–169. https://doi.org/10.1023/A:1026502219867
Sarmaja-Korjonen, K., Nyman, M., Kultti, S. & Väliranta, M. (2006) Palaeolimnological development of Lake Njargajavri, northern Finnish Lapland, in a changing Holocene climate and environment. Journal of Paleolimnology, 35 (1), 65–81. https://doi.org/10.1007/s10933-005-7337-6
Szeroczyńska, K. & Sarmaja-Korjonen, K. (2007) Atlas of Subfossil Cladocera from Central and Northern Europe. Friends of the Lower Vistula Society, Świecie, 84 pp.
Sienkiewicz, E. & Gąsiorowski, M. (2016) The effect of fish stocking on mountain lake plankton communities identified using palaeobiological analyses of bottom sediment cores. Journal of Paleolimnology, 55 (2), 129–150. https://doi.org/10.1007/s10933-015-9870-2
Sinev, A.Y. (2001) Distribution and polymorphism of Alona rectangula Sars, 1861 (Branchiopoda: Cladocera: Anomopoda) in Russia and surrounding countries. Arthropoda Selecta, 10 (2), 83–86.
Sinev, A.Y. & Dumont, H.J. (2016) Revision of costata-group of Alona s. lato (Cladocera: Anomopoda: Chydoridae) confirms its generic status. European Journal of Taxonomy, 233, 1–38. https://doi.org/10.5852/ejt.2016.223
Sinev, A.Y. & Kotov, A.A. (2014) Revision of the Holarctic genus Rhynchotalona Norman, 1903 (Anomopoda: Chydoridae). Zootaxa, 3841 (2), 188–210. https://doi.org/10.11646/zootaxa.3841.2.2
Sousa, F.D.R., Elomoor-Loureiro, L.M.A. & Panarelli, E.A. (2017) The amazing diversity of the genus Monospilus Sars, 1862 (Crustacea: Branchiopoda: Aloninae) in South America. Zootaxa, 4242 (3), 467–492. https://doi.org/10.11646/zootaxa.4242.3.3
Sweetman, J.N. & Sarmaja-Korjonen, K. (2017) First evidence for the occurrence of Unapertura (Crustacea, Branchiopoda, Anomopoda, Chydoridae) in North America based on subfossil remains. Journal of Paleolimnology, 58, 291–297. https://doi.org/10.1007/s10933-017-9978-7
Van Damme, K. & Eggermont, H. (2011) The Afromontane Cladocera (Crustacea: Branchiopoda) of the Rwenzori (Uganda–DR Congo): taxonomy, ecology and biogeography. Hydrobiologia, 676 (1), 57–100. https://doi.org/10.1007/s10750-011-0892-0
Van Damme, K. & Nevalainen, R.L. (2019) The most latent cladoceran in the Holarctic revealed—sinking Unapertura Sarmaja-Korjonen, Hakojärvi & Korhola, 2000 into the genus Rhynchotalona Norman, 1903 (Branchiopoda: Cladocera: Chydoridae). Zootaxa, 4613 (3), 463–476. https://doi.org/10.11646/zootaxa.4613.3.3
Van Damme, K., Sinev, A.Y. & Dumont, H.J. (2011) Separation of Anthalona gen.n. from Alona Baird, 1843 (Branchiopoda: Cladocera: Anomopoda): morphology and evolution of scraping stenothermic alonines. Zootaxa, 2875 (1), 1–64. https://doi.org/10.11646/zootaxa.2875.1.1