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In this study, we provide a complete morphological description of the first protozoeal stage of the valued deep-sea blue and red shrimp<jats:italic>Aristeus antennatus<\/jats:italic>and of the small mesopelagic shrimp<jats:italic>Gennadas elegans<\/jats:italic>. These two larval morphologies previously posed a risk of misidentification, thus hindering the study of<jats:italic>A. antennatus<\/jats:italic>larval ecology and dynamics in the context of fisheries science. Using specimens caught in the plankton at various locations in the Northwestern Mediterranean Sea and identification confirmed by molecular methods, the larvae of<jats:italic>A. antennatus<\/jats:italic>and<jats:italic>G. elegans<\/jats:italic>are distinguished from each other by the ornamentation of the antennula. A possible confusion in previous descriptions of Aristeidae larvae is addressed and a new key for the identification of Dendrobranchiata larvae provided.<\/jats:p>","DOI":"10.1038\/s41598-020-68044-9","type":"journal-article","created":{"date-parts":[[2020,7,7]],"date-time":"2020-07-07T10:04:08Z","timestamp":1594116248000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Morphological description of the first protozoeal stage of the deep-sea shrimps Aristeus antennatus and Gennadas elegans, with a key"],"prefix":"10.1038","volume":"10","author":[{"given":"Marta","family":"Carreton","sequence":"first","affiliation":[]},{"given":"Antonina","family":"Dos Santos","sequence":"additional","affiliation":[]},{"given":"L\u00edgia Faria","family":"De Sousa","sequence":"additional","affiliation":[]},{"given":"Guiomar","family":"Rotllant","sequence":"additional","affiliation":[]},{"given":"Joan B.","family":"Company","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2020,7,7]]},"reference":[{"issue":"2","key":"68044_CR1","doi-asserted-by":"publisher","first-page":"153","DOI":"10.1577\/1548-8659(1984)113<153:OAETOF>2.0.CO;2","volume":"113","author":"BL Norcross","year":"1984","unstructured":"Norcross, B. 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