Rhynchotalona latens (Sarmaja-Korjonen, Hakojarvi & Korhola, 2000)



Taxonomy & Nomenclature

Synonym/s: Unapertura latens Sarmaja-Korjonen, Hakojarvi & Korhola, 2000 (original combination)


Conservation Status

Previously only known as a fossil species, living specimens were later discovered (van Damme & Nevlainen, 2019).



Finland & Russia


Only recently reported from Russia (Nigmatullin et al., 2021).


Biology & Ecology










Original scientific description:

Kaarina Sarmaja-Korjonen, Mari Hakojärvi and Atte Korhola. (2000). Subfossil remains of an unknown chydorid (Anomopoda: Chydoridae) from Finland. Hydrobiologia 436(1-3): 165-169. [Abstract]


Other references:

Cotten, C. A. (1985). Cladoceran assemblages related to lake conditions of Eastern Finland. Unpublished Ph.D. Thesis, Department of Biology, University of Indiana, Bloomington. 96 pp.

van Damme, Kay and Nevalainen, Liisa. (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.

Fefilova, Elena et al. (2020). Biogeographic patterns of planktonic and meiobenthic fauna diversity in inland waters of the Russian Arctic. Freshwater Biology. [Abstract]

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.

Nevalainen, Liisa. (2008). Sexual reproduction in chydorid cladocerans (Anomopoda, Chydoridae) in southern Finland—implications for paleolimnology. Ph.D. thesis. Publications of the Department of Geology D16, University of Helsinki, Helsinki, 54 pp.

Nevalainen, Liisa, Kivilä, E. Henriikka, Luoto, Tomi P., Rantala, Marttiina V. and Van Damme, Kay. (2019). A hidden species becoming visible: biogeography and ecology of Rhynchotalona latens (Cladocera, Anomopoda, Chydoridae). Hydrobiologia 837(1): 47-59.

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. (In Russian)

Szeroczyńska, K. and Sarmaja-Korjonen, K. (2007). Atlas of Subfossil Cladocera from Central and Northern Europe. Friends of the Lower Vistula Society, Świecie. 84 pp.


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