Andrey V. Gebruk

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Enteropneusts (phylum Hemichordata), although studied extensively because of their close relationship to chordates, have long been considered shallow-water, burrowing animals. The present paper more than doubles the number of enteropneust species recorded in the deep sea based on high-resolution imaging and sampling with remotely operated vehicles. We(More)
The deep ocean is home to a group of broad-collared hemichordates--the so-called 'lophenteropneusts'--that have been photographed gliding on the sea floor but have not previously been collected. It has been claimed that these worms have collar tentacles and blend morphological features of the two main hemichordate body plans, namely the tentacle-less(More)
In contrast to generally sparse biological communities in open-ocean settings, seamounts and ridges are perceived as areas of elevated productivity and biodiversity capable of supporting commercial fisheries. We investigated the origin of this apparent biological enhancement over a segment of the North Mid-Atlantic Ridge (MAR) using sonar, corers, trawls,(More)
Two novel triterpene holostane nonsulfated pentaosides, kolgaosides A (1) and B (2), and one known, holothurinoside B (3), were isolated from the Arctic sea cucumber Kolga hyalina, the second representative of the family Elpidiidae, order Elasipodida, from which triterpene glycosides have been obtained. The structures of 1 and 2 were elucidated using 1H and(More)
A benthic species inventory of 1,125 taxa was compiled from various sources for the central Arctic deeper than 500 m, and bounded to the Atlantic by Fram Strait. The inventory was dominated by arthropods (366 taxa), foraminiferans (197), annelids (194), and nematodes (140). An additional 115 taxa were added from the Greenland–Iceland–Norwegian Seas (GIN).(More)
With increasing demand for mineral resources, extraction of polymetallic sulphides at hydrothermal vents, cobalt-rich ferromanganese crusts at seamounts, and polymetallic nodules on abyssal plains may be imminent. Here, we shortly introduce ecosystem characteristics of mining areas, report on recent mining developments, and identify potential stress and(More)
Peniagone horrifer Théel, 1882 was collected at abyssal depths from around the Crozet Islands in the southern Indian Ocean on RRS Discovery Cruise 300 in 2005. Previously known from only one specimen, P. horrifer is re-described based on a large haul of preserved material and an in situ photograph of the species on the seabed.
A single specimen of a previously undescribed acorn worm in the family Torquaratoridae was trawled from a bottom depth of about 350 m in the Kara Sea (Russian Arctic). The new species is the shallowest of the exclusively deep-sea torquaratorids found to date, possibly an example of high-latitude emergence. On the basis of ribosomal DNA sequences and(More)
Material collected from the RRS Discovery Cruise 300 to the Crozet Islands contained a new species of elasipodid holothurian Peniagone crozeti sp. nov. This new species dominated the megafauna at an abyssal site to the east of the islands under an area of high surface productivity, but was found in low abundance at a site located south of the islands under(More)
The modern classification distinguishes two type of hydrothermal circulation systems (HCSs) in the world rift system: the widespread, so-called axial HCS and the deep HCS [1–3]. To date, the hydrothermal activities of only two areas, Rainbow and Logatchev ( 14°45 ′ N), are known to be related to the deep HCSs. Both areas are located on the Mid-Atlantic(More)
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