Deep-sea amphipod genus Eurythenes from Japan, with a description of a new Eurythenes species from off Hokkaido (Crustacea: Amphipoda: Lysianassoidea)

Narahara-Nakano, Yukiko; Nakano, Takafumi; Tomikawa, Ko

doi:10.1007/s12526-017-0758-4

Cited by 10 publications

(11 citation statements)

References 28 publications

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“…A third species, Eurythenes gryllus (Lichtenstein, 1822), was also reported previously by Blankenship et al (2006). Until recently, E. gryllus was considered a cosmopolitan species, however, D’Udekem D’Acoz & Havermans (2015) identified nine distinct genetic lineages and described five new species and, subsequently, Narahara-Nakano, Nakano & Tomikawa (2017) added another species from the Japanese Seas and discussed the deep-sea species diversity of the Pacific Ocean. The new species include E. sigmiferus that was also reported from the Kermadec Trench based on an image record (N. Kilgallen, 2017, personal communication), and which is the only species of Eurythenes encountered in this study.…”

Section: Discussionmentioning

confidence: 59%

Bait-attending amphipods of the Tonga Trench and depth-stratified population structure in the scavenging amphipod Hirondellea dubia Dahl, 1959

Wilson

Schnabel

Rowden

et al. 2018

PeerJ

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BackgroundThe hadal zone encompasses the deepest parts of the world’s ocean trenches from depths of ∼6,000–11,000 m. The communities observed at these depths are dominated by scavenging amphipods that rapidly intercept and consume carrion as it falls to the deepest parts of the trenches. New samples collected in the Tonga Trench provide an opportunity to compare the amphipod assemblages and the population structure of a dominant species, Hirondellea dubia Dahl, 1959, between trenches and with earlier data presented for the Tonga Trench, and other trenches in the South Pacific.MethodsOver 3,600 individual scavenging amphipods across 10 species were collected in seven baited traps at two sites; in the Horizon Deep site, the deepest part of the Tonga Trench (10,800 m) and a site directly up-slope at the trench edge (6,250 m). The composition of the bait-attending amphipods is described and a morphometric analysis of H. dubia examines the bathymetric distribution of the different life stages encountered.ResultsThe amphipod assemblage was more diverse than previously reported, seven species were recorded for the first time from the Tonga Trench. The species diversity was highest at the shallower depth, with H. dubia the only species captured at the deepest site. At the same time, the abundance of amphipods collected at 10,800 m was around sevenfold higher than at the shallower site. H. dubia showed clear ontogenetic vertical structuring, with juveniles dominant at the shallow site and adults dominant at the deep site. The amphipods of the deeper site were always larger at comparable life stage.DiscussionThe numbers of species encountered in the Tonga Trench is less than reported from the New Hebrides and Kermadec trenches, and six species encountered are shared across trenches. These findings support the previous suggestion that the fauna of the New Hebrides, Tonga and Kermadec Trenches may represent a single biogeographic province. The ontogenetic shift in H. dubia between the two Tonga Trench sites supports the hypothesis of interspecific competition at the shallower bathymetric range of the species, and the presence of competitive physiological advantages that allow the adults at the trench axis to exploit the more labile organic material that reaches the bottom of the trench.

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Section: Discussionmentioning

confidence: 59%

Bait-attending amphipods of the Tonga Trench and depth-stratified population structure in the scavenging amphipod Hirondellea dubia Dahl, 1959

Wilson

Schnabel

Rowden

et al. 2018

PeerJ

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“…nov. within Eurythenes was investigated with publicly available data in two datasets, namely, 16S and COI. The comparative sequences were selected to represent type material, highconfident identifications, or from defined undescribed lineages (Table 2; France and Kocher 1996;Escobar-Briones et al 2010;Havermans et al 2013;d'Udekem d'Acoz and Havermans 2015;Ritchie et al 2015;Havermans 2016;Narahara-Nakano et al 2018;Ritchie et al 2017;Horton et al 2020;Weston et al 2020a). The sequences associated with Eurythenes cf.…”

Section: Dna Barcoding and Phylogeneticsmentioning

confidence: 99%

“…Cryptic speciation with the gryllus-complex has since been confirmed by integrative taxonomic studies (Havermans et al 2013;Havermans 2016;Eustace et al 2016). Since 2015, Eurythenes has expanded from three to nine described species (d'Udekem d 'Acoz and Havermans 2015;Narahara-Nakano et al 2018;Weston et al 2020a). Furthermore, at least five distinct genetic lineages are awaiting formal description (France and Kocher 1996;Havermans et al 2013;Eustace et al 2016;Horton et al 2020) and more are likely to be discovered via expansion of sampling programs (Havermans 2016).…”

Section: Introductionmentioning

confidence: 98%

Eurythenes atacamensis sp. nov. (Crustacea: Amphipoda) exhibits ontogenetic vertical stratification across abyssal and hadal depths in the Atacama Trench, eastern South Pacific Ocean

et al. 2021

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Eurythenes S.I. Smith in Scudder, 1882 (Crustacea: Amphipoda) are prevalent scavengers of the benthopelagic community from bathyal to hadal depths. While a well-studied genus, molecular systematic studies have uncovered cryptic speciation and multiple undescribed lineages. Here, we apply an integrative taxonomic approach and describe the tenth species, Eurythenes atacamensis sp. nov., based on specimens from the 2018 Atacamex and RV Sonne SO261 Expeditions to the southern sector of the Peru-Chile Trench, the Atacama Trench (24–⁠21°S). Eurythenes atacamensis sp. nov. is a large species, max. observed length 83.2 mm, possesses diagnostic features, including a short gnathopod 1 palm and a chelate gnathopod 2 palm, and a distinct genetic lineage based on a 16S rRNA and COI phylogeny. This species is a dominant bait-attending fauna with an extensive bathymetric range, spanning from 4974 to 8081 m. The RV Sonne SO261 specimens were recovered along a 10-station transect from abyssal to hadal depths and further examined for demographic and bathymetric-related patterns. Ontogenetic vertical stratification was evident across the trench axis, with only juveniles present at abyssal depths (4974–6025 m). Total length-depth analysis revealed that the size of females was unrelated to depth, whereas juveniles followed a sigmoidal relationship with a step-up in size at depths >7200 m. Thus, these bathymetric trends suggest that juveniles and females employ differing ecological strategies in subduction trench environments. This study highlights that even dominant and ecologically important species are still being discovered within the abyssal and hadal environments. Continued systematic expeditions will lead to an improved understanding of the eco-evolutionary drivers of speciation in the world’s largest ecosystem.

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“…6) (Kamenskaya 1981(Kamenskaya , 1997Lörz 2010;Jażdżewska and Mamos 2019). Deep-sea amphipod species previously regarded as widely distributed have since been found to contain cryptic species (e.g., Narahara-Nakano et al 2018). Lörz (2010) also considered that P. abyssalis, as reported from multiple trenches by Kamenskaya (1981), may contain other or undescribed species.…”

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confidence: 99%

A new species of Princaxelia from Shinkai Seep Field, Mariana Trench (Crustacea, Amphipoda, Pardaliscidae)

Tomikawa¹,

Watanabe²,

Tanaka³

et al. 2021

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Deep-sea amphipod genus Eurythenes from Japan, with a description of a new Eurythenes species from off Hokkaido (Crustacea: Amphipoda: Lysianassoidea)

Cited by 10 publications

References 28 publications

Bait-attending amphipods of the Tonga Trench and depth-stratified population structure in the scavenging amphipod Hirondellea dubia Dahl, 1959

Bait-attending amphipods of the Tonga Trench and depth-stratified population structure in the scavenging amphipod Hirondellea dubia Dahl, 1959

Eurythenes atacamensis sp. nov. (Crustacea: Amphipoda) exhibits ontogenetic vertical stratification across abyssal and hadal depths in the Atacama Trench, eastern South Pacific Ocean

A new species of Princaxelia from Shinkai Seep Field, Mariana Trench (Crustacea, Amphipoda, Pardaliscidae)

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