Contribution to the systematics of the genus Eurythenes S.I. Smith in Scudder, 1882 (Crustacea: Amphipoda: Lysianassoidea: Eurytheneidae)

The genus Eurythenes S.I. Smith in Scudder, 1882 was previously considered as consisting of three highly distinctive species: E. gryllus (Lichtenstein in Mandt, 1822), E. thurstoni Stoddart & Lowry, 2004 and E. obesus (Chevreux, 1905). E. gryllus has been considered as a common cosmopolitan and...

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Bibliographic Details
Published in:Zootaxa
Main Authors: d’ACOZ, CÉDRIC d’UDEKEM, HAVERMANS, CHARLOTTE
Format: Article in Journal/Newspaper
Language:English
Published: Mangolia Press 2015
Subjects:
Amphipoda
Lysianassoidea
Eurythenes
Southern Ocean
Arctic Ocean
Atlantic
bipolar species
bathyal
abyssal
reverse taxonomy
pseudocryptic species
new species
Crustacea
Arctic
West Antarctica
Lowry
Chevreux
Cape Horn
Antarc*
Antarctica
Online Access:https://www.mapress.com/j/zt/article/view/zootaxa.3971.1.1
https://doi.org/10.11646/zootaxa.3971.1.1
Description
Summary:The genus Eurythenes S.I. Smith in Scudder, 1882 was previously considered as consisting of three highly distinctive species: E. gryllus (Lichtenstein in Mandt, 1822), E. thurstoni Stoddart & Lowry, 2004 and E. obesus (Chevreux, 1905). E. gryllus has been considered as a common cosmopolitan and eurybathic species recorded down to a depth of 7800 m. However, the analysis of DNA sequences (COI, 16S, 28S) of newly collected specimens combined with GenBank sequences revealed the existence of nine genetic lineages within E. gryllus sensu lato. Specimens were recovered by tree-construction methods in distinct, well-supported clades and were separated by genetic divergences in the same range as interspecific values documented for other lysianassoid species. Furthermore, in some cases, different lineages were found at the same sampling locality. Specimens of six of the nine clades were examined directly. With one exception, these clades are separated by small but consistent morphological differences. As a consequence, five morphospecies are recognized herein within the E. gryllus complex: E. andhakarae sp. nov. (West Antarctica, abyssal), E. gryllus (bipolar, bathyal), E. magellanicus H. Milne Edwards, 1848 (Cape Horn and Brazil Basin, abyssal), E. maldoror sp. nov. (nearly cosmopolitan, abyssal), E. sigmiferus sp. nov. (at least West Atlantic, possibly nearly cosmopolitan, abyssal).

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