Agradecimentos: This study was supported by the project The NextSea (NORTE‐01‐0145‐FEDER‐000032), under the PORTUGAL 2020 Partnership Agreement, through the European Regional Development Fund (ERDF). Marcos A.L. Teixeira was supported by a PhD grant from FCT co‐financed by ESF (SFRH/BD/131527/2017)....

Agradecimentos: This study was supported by the project The NextSea (NORTE‐01‐0145‐FEDER‐000032), under the PORTUGAL 2020 Partnership Agreement, through the European Regional Development Fund (ERDF). Marcos A.L. Teixeira was supported by a PhD grant from FCT co‐financed by ESF (SFRH/BD/131527/2017). Ascensão Ravara was supported by a postdoctoral grant from FCT co‐financed by ESF and MEC (SFRH/BPD/112408/2015). Bruno Sampieri was supported by a postdoctoral grant from São Paulo Research Foundation (FAPESP) grant No. 2017/06167‐5. Financial support to Arne Nygren from the Norwegian Taxonomy Initiative [http://www.biodiversity.no/Pages/135523] (Cryptic polychaete species in Norwegian waters, knr 49‐13, pnr 70184228), the Swedish Taxonomy Initiative [https://www.artdatabanken.se/en/the-swedish-taxonomy-initiative/] (Polychaete species complexes in Swedish waters, dnr 140/07 1.4 and 166/08 1.4), and Kungliga Fysiografiska sällskapet Nilsson‐Ehle donationerna [https://www.fysiografen.se/sv/]

We report on two new lineages of the Eumida sanguinea complex from Great Britain and describe one of them as a new species using a multilocus approach, including the mitochondrial DNA COI-5P and the nuclear markers ITS (ITS1, 5.8S rRNA and ITS2) and 28S rRNA. The molecular analysis placed Eumida...

We report on two new lineages of the Eumida sanguinea complex from Great Britain and describe one of them as a new species using a multilocus approach, including the mitochondrial DNA COI-5P and the nuclear markers ITS (ITS1, 5.8S rRNA and ITS2) and 28S rRNA. The molecular analysis placed Eumida mackiei sp. nov. in a monophyletic clade with 19.1% (COI), 10.1% (ITS) and 1.7% (28S) mean distance to its nearest neighbour. Molecular diagnoses were also applied to nine lineages within the E. sanguinea complex. This was complemented with morphometric data employing multivariate statistical analysis and the incorporation of statistical dissimilarities against three other described species from the complex. Eumida mackiei sp. nov. can be distinguished from E. notata and E. maia by the larger distance between the eyes and differences in morphometric proportions mainly in the dorsal and ventral cirri as well as in the prostomial appendages. E. sanguinea sensu stricto failed to produce a cluster of its own in the morphometric analysis, probably due to juvenile bias. Integrative taxonomy provided strong evidence to formally describe a new cryptic species that can now be used in biomonitoring or other relevant ecological research

FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESP

2017/06167-5

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