highlights
A first look at xenophyophores (Rhizaria, Foraminifera) in the lower bathyal Bering Sea and abyssal areas adjacent to the Aleutian Trench
Xenophyophores are an abundant component of the megafauna in parts of the equatorial and temperate North Pacific, but few records exist of these giant agglutinated foraminifera in northern North Pacific and adjacent waters. Here, we present a preliminary survey of xenophyophores from the bathyal Bering Sea (∼3500 m depth) and at abyssal depths (4294–6555 m) adjacent to the Aleutian Trench, based on collected material, mainly fragments, and seafloor images. The dominant xenophyophore in the Bering Sea is a reticulated form that yielded DNA sequences identical to those obtained from Syringammina limosa, a species described from > 2700 km to the west in the Sea of Okhotsk. Also visible in seafloor photographs were various plate-like forms, often with upturned, undulating rims, but also branching plates and other more complicated morphotypes that probably represent distinct species. At stations close to the Aleutian Trench, core and epibenthic sledge samples yielded xenophyophores at seven of the 16 sampling sites. At least eleven morphospecies were recognised among those collected, none of which resembled S. limosa or the plate-like Bering Sea forms. Seafloor images revealed 16 fairly distinct domed or plate-like morphotypes three of these are possibly represented among the collected specimens, making a total of around 24 morphotypes or morphospecies. A few images show morphotypes similar to those seen in the Bering Sea. Our results suggests that xenophyophores are as diverse in the northern North Pacific as they are elsewhere in the Pacific Ocean.
Kostas Kampourakis is the 2024 winner of the Friend of Darwin award
Honored with Prestigious Award: Kostas Kampourakis Receives "Friend of Darwin 2024"
Understanding Architecture And Evolutionary Patterns In Haplolepidous Peristomes (Dicranidae, Bryophyta) Using Histology And Micro-Morphology
25.07.2023 14:00, Salle de conférence (Museum of Natural History)
Mathilde Ruche (Michelle Price's group).
hosted by: Michelle Price.
Research
Our department hosts 12 research laboratories gathering close to 200 scientists, engineers and technical staff. Research topics cover a large variety of topics, such as developmental genetics and neurogenetics, regeneration, evo-devo, physics of biology, phylogenetics or anthropology.
moreevents
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25 Jul
Understanding Architecture And Evolutionary Patterns In Haplolepidous Peristomes (Dicranidae, Bryophyta) Using Histology And Micro-Morphology
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30 Aug
to be announced
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29 Sep
Mechanobiology of cell shape control
contact
Department of Genetics and Evolution
Quai Ernest-Ansermet, 30
1205 Geneva
Switzerland
office: 4002A
T: +41 22 379 67 85
