Tumskaya V.V.1, Neretina A.N.1, Kosintsev P.A.2, Korona O.M.2, Kotov A.A.1* 2026. First data on crustacean remains (Crustacea: Branchiopoda) in the coastal sediments of Lake Pechevalavato (Yamal Peninsula, Russia) // Arthropoda Selecta. Vol.35. No.1: 16–25 [in English].
1 A.N. Severtsov Institute of Ecology and Evolution, Leninsky Prospect 33, Moscow 119071 Russia.
2 Institute of Plant and Animal Ecology, Ural Branch of the Russian Academy of Sciences, 8th March Str. 202, Ekaterinburg 620144 Russia.
* Corresponding author
Vasilisa Tumskaya vasilisa.tymskaya@yandex.ru; https://orcid.org//0009-0009-4668-7788
Anna Neretina neretina-anna@yandex.ru; https://orcid.org/0000-0002-6876-079X
Alexey Kotov alexey-a-kotov@yandex.ru; https://orcid.org/0000-0002-8863-6438
Olga Korona korona@ipae.uran.ru; https://orcid.org/0000-0001-8878-3385
Pavel Kosintsev kpa@ipae.uran.ru; https://orcid.org/0000-0002-0973-7426
doi: 10.15298/arthsel.35.1.03
ABSTRACT. Here we present the first data on crustacean remains in Holocene sediments of Lake Pechevalavato (Yamal Peninsula, Western Siberia). An investigated outcrop was formed as a result of thermal abrasion of deposits located at the second marine terrace. From this outcrop, 48 samples were collected for paleolimnological analysis; crustacean remains were found in nine samples. In total, 34 ephippia, a fragment of thoracic limb filter plate and 45 mandibles were analyzed. Based on details of morphology, 20 ephippia were classified as belonging to Daphnia pulex-type, 14 ephippia — to D. longispina-type. A filter plate was found in the upper layer together with Daphnia ephippia and presumably belongs to this genus. Based on shape and size, all found mandibles belonged to notostracan Lepidurus arcticus (Pallas, 1793). According to our data, the outcrop point became to be a part of a lake (most probably, Lake Pechevalavato or a separate lake near it) c.a. 5.5–6 kya, before this time it was a terrestrial or swampy territory. Then the lake surface and depth were reduced for some reasons unknown to us. Fauna of this lake was poorer as compared to previously described Holocene water bodies of Yamal. We have demonstrated that different types of water bodies existed in the central part of Yamal Peninsula during the Holocene.
KEY WORDS: Cladocera, Notostraca, Yamal Peninsula, Western Siberia, Holocene, paleoenvironment, paleoecology.