Cunea russae n. sp. (Amoebozoa,Dactylopodida), another cryptic species of Cunea Kudryavtsev and Pawlowski, 2015, inhabits a continental brackish-water biotope |
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| Institution: | 1. Laboratory of Cellular and Molecular Protistology, Zoological Institute, Russian Academy of Sciences, 199034 St. Petersburg, Russia;2. Department of Invertebrate Zoology, Faculty of Biology, St. Petersburg State University, 199034 St. Petersburg, Russia;1. Terrestrial Ecology Section, Department of Biology, University of Copenhagen, Universitetsparken 15, DK-2100 Copenhagen Ø, Denmark;2. St. Petersburg State University, Universitetskaya emb. 7-9, St. Petersburg, 199034, Russia;3. Zoological Institute RAS, Universitetskaya emb. 1, St. Petersburg, 199034, Russia;1. Graduate School of Bioscience and Biotechnology, Fukui Prefectural University, Obama, Fukui 917-0003, Japan;2. Department of Marine Bioscience, Fukui Prefectural University, Obama, Fukui 917-0003, Japan;1. Department of Invertebrate Zoology, Faculty of Biology, Saint-Petersburg State University, Universitetskaya nab. 7/9, 199034 Saint-Petersburg, Russia;2. Laboratory of Parasitic Worms and Protistology, Zoological Institute RAS, Universitetskaya nab. 1, 199034 St. Petersburg, Russia;3. Molecular Systematics and Environmental Genomics, Department of Genetics and Evolution, University of Geneva, CH-1211 Geneva, Switzerland;1. Technical University of Denmark, National Institute of Aquatic Resources (DTU Aqua), Kemitorvet, Bygning 201, DK 2800 Kgs. Lyngby, Denmark;2. National Oceanography Centre, Southampton SO14 3ZH, United Kingdom;3. Nørrebrogade 52a 5th, 2200 Copenhagen N, Denmark;1. Technical University of Denmark, National Institute of Aquatic Resources (DTU Aqua), Kemitorvet, Bygning 201, DK 2800 Kgs. Lyngby, Denmark;2. National Oceanography Centre, Southampton SO14 3ZH, United Kingdom;3. Nørrebrogade 52a 5th, 2200 Copenhagen N, Denmark |
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| Abstract: | The genus Cunea Kudryavtsev and Pawlowski, 2015 (Amoebozoa, Dactylopodida) was initially described from the oceanic benthos: C. profundata, from over 5 km depth in the Atlantic Ocean, and C. thuwala from the Red Sea benthos at ca. 60 m depth. Both species are identical to each other in morphology (including cell coat ultrastructure), but differ significantly in the gene sequence data, including barcoding loci of small subunit ribosomal RNA and cytochrome oxidase subunit 1 gene, as well as actin. This paper describes the third species of Cunea, C. russae n. sp. isolated from a brackish water habitat without a direct connection to the ocean, a small spring of brackish water (19‰) emerging from a 246 m deep hole in the earth. This species is morphologically identical to the previous two amoebae, but differs from them significantly in the gene sequence data and ecological preferences. In particular, this species has the broadest salinity tolerance range, being able to reproduce well already at 2.5‰. It is also capable of resisting cold temperatures, like C. profundata. The data obtained suggest that the genus Cunea may comprise a significant taxonomic diversity represented by morphologically identical, but quickly diverging species with significant ecological plasticity. |
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| Keywords: | Amoebozoa Cryptic speciation Ecological tolerance Molecular phylogeny Morphology |
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