Abstract
Lebbeus sokhobio sp. nov. is described from abyssal depths (3303−3366 m) in the Kuril Basin of the Sea of Okhotsk. The related congeners are deep-water dwellers with a very distant distribution and very similar morphology. The new species is separated by minor morphological features, such as the armature of the rostrum and telson, meral spinulation of ambulatory pereiopods and the shape of the pleonal pleurae. This species is the deepest dwelling representative of the genus Lebbeus and the family Thoridae. A list of records of caridean shrimps recorded from abyssal depths below 3000 m is given.
Highlights
The fauna of benthic caridean shrimps (Crustacea: Decapoda: Caridea) living at depths of more than 3000 m is poorly known due to the technical difficulties of sampling
There are many records of caridean shrimps from the abyssal depths, but it is still expected that deeper sampling in different regions of the world oceans will provide new records and interesting scientific data
The Agassiz Trawl (AGT) used in the SokhoBio 2015 Expedition was of a standard design with frame dimensions of 350 × 70 cm and a mesh size of 10 mm
Summary
The fauna of benthic caridean shrimps (Crustacea: Decapoda: Caridea) living at depths of more than 3000 m is poorly known due to the technical difficulties of sampling. The deepest known records of caridean shrimps are Parapontophilus abyssi (Smith, 1884) (Crangonidae), collected from a depth of 5852 m (Chace 1984), Glyphocrangon atlantica Chace, 1939 (Glyphocrangonidae) from 6364–6373 m (Holthuis 1971; Gore 1985), and the bathypelagic Heterogenys microphthalma (Smith, 1885) and Acanthephyra sica Spence Bate, 1888 (Acanthephyridae) from 5060 m (Wicksten et al 2017; Crosnier 1987) and 6890 m (Lörz et al 2012), respectively. The limiting factors for the deep-sea distribution of decapod crustaceans are still unknown due to the small number of collected samples and insufficient knowledge of the biology and ecology of such species. Wolff (1970) proposed the physiological limitation of hydrostatic pressure as a factor limiting the deeper distribution of species in Decapoda
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