A new predator connecting the abyssal with the hadal in the Kuril-Kamchatka Trench, NW Pacific

• Published in: PeerJ
• Main Authors: Lörz, Anne-Nina, Jażdżewska, Anna Maria, Brandt, Angelika
• Format: Text
• Language: English
• Published: PeerJ Inc. 2018
• Subjects: Marine Biology; Pacific; Kamchatka
• Online Access: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5994337/; http://www.ncbi.nlm.nih.gov/pubmed/29892501; https://doi.org/10.7717/peerj.4887

The bathyal to hadal deep sea of north-west Pacific Ocean was recently intensively sampled during four international expeditions (KuramBio I and II, SoJaBio and SokhoBio). A large amphipod, Rhachotropis saskia n. sp., was sampled in the Kuril-Kamchatka Trench and increases the number of described hadal species of that area to eight. A detailed description of the new species is provided, including illustrations, scanning-microscope images and molecular analysis. This predatory species was sampled at both continental and ocean abyssal margins of the Kuril-Kamchatka Trench as well as at hadal depths of the trench. The wide bathymetric distribution of the new species over more than 3,000 m is confirmed by molecular analysis, indicating that the Kuril Kamchatka Trench is not a distribution barrier for this species. However, the molecular analysis indicated the presence of isolation by distance of the populations of the studied taxon.