Abstract
The genus Eurythenes S. I. Smith in Scudder, 1882, has been the focus of integrated molecular and morphological taxonomy studies in recent years, resulting in the number of species in the genus increasing from three to eight. Samples of Eurythenes spp. collected using free-fall baited traps from the Porcupine Abyssal Plain (PAP), North East Atlantic Ocean, at 4850 m were examined in this study to investigate the identity of the species found using molecular barcoding methods. Mitochondrial COI analysis confirms the presence of E. maldoror at PAP and data from the nuclear 28S rDNA gene provides independent confirmation of this observation. A new, undescribed species that is clearly divergent from all other known species and molecular lineages was identified, which can be distinguished morphologically from known species. A specimen within the E. magellanicus lineage was also found at the site. We discuss the presence of these three Eurythenes species at the Porcupine Abyssal Plain.
Highlights
In recent years, the genus Eurythenes S
A specimen within the E. magellanicus lineage was found at Porcupine Abyssal Plain (PAP)
DY077/83_B2) was more closely related to specimens identified as E. magellanicus collected from the western Pacific (OKI-3 (Narahara-Nakano et al, 2018) and TAI-1 (Havermans, 2016)) than to the Atlantic lineages from the Brazil Basin (BraB-4, BraB5 and BraB-7 (Havermans et al, 2013)), which include the E. magellanicus voucher sequence
Summary
There has been considerable doubt regarding the identity of Eurythenes gryllus, and discussions of whether the species is truly cosmopolitan or comprised of a complex of species, can be found in a number of studies (Barnard, 1961; Bowman and Manning, 1972; France and Kocher, 1996; Ingram and Hessler, 1983; Thurston and Bett, 1995; Bucklin et al, 1987). In 2004, a third species Eurythenes thurstoni Stoddart and Lowry, 2004 was described, alongside a thorough redescription of the known species in the genus from type materials. In 2004, a third species Eurythenes thurstoni Stoddart and Lowry, 2004 was described, alongside a thorough redescription of the known species in the genus from type materials. Havermans et al (2013), explored the variability of the genus on a global scale using analyses of nuclear (28S rDNA) and mitochondrial (COI and 16S rDNA) sequence data, and revealed nine lineages within the Eurythenes complex
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