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Description of a new pseudocryptic species of Elysia Risso, 1818 (Heterobranchia, Sacoglossa) in the Mediterranean Sea

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A new sacoglossan species of the genus Elysia Risso, 1818 from southern Italy is described based on its external morphology, color pattern, radular teeth, and reproductive system. Specimens of this new species were previously attributed to Elysia viridis (Montagu, 1804) because of morphological similarity, but maximum-likelihood and Bayesian analyses based on four genes (mitochondrial cytochrome c oxidase subunit I, 16S rRNA, nuclear 28S rRNA, Histone 3), including 28 additional species of Elysia from the Atlantic, showed that they are distinct. In addition, to determine the identity of these specimens, different species delimitation analyses [Automatic Barcode Gap Discovery (ABGD), General Mixed Yule Coalescent (GMYC), Bayesian Poisson Tree Processes, (bPTP)] were carried out. The molecular results support the validity of this new species of Elysia from the Mediterranean Sea, named Elysia rubeni sp. nov. This new species is characterized by a bright light greenish surface color due to the abundance of kleptoplasts. It can be distinguished by its bright blue specks and minute sparkling yellow dots scattered along the body, as well as its smooth and greyish rhinophores.
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Document Type: Research Article

Affiliations: 1: Departamento de Biología, Facultad de Ciencias del Mar y Ambientales, Campus de Excelencia Internacional del Mar (CEIMAR), Universidad de Cádiz, Avenida República Saharaui s/n, Apdo. 40, 11510 Puerto Real (Cádiz), Spain; Instituto Universitario de Investigación Marina (INMAR), Campus de Excelencia Internacional del Mar (CEIMAR), Universidad de Cádiz, Avenida República Saharaui s/n, Apdo. 40, 11510 Puerto Real (Cádiz), Spain;, Email: [email protected] 2: Instituto Universitario de Investigación Marina (INMAR), Campus de Excelencia Internacional del Mar (CEIMAR), Universidad de Cádiz, Avenida República Saharaui s/n, Apdo. 40, 11510 Puerto Real (Cádiz), Spain 3: Zoological Museum, Natural History Museum of Denmark, Universitetsparken 15, DK-2100 Copenhagen Ø, Denmark 4: Cooperativa Hydra Viale Ugo Foscolo, 30 73100 Lecce, Italy; Associazione Salento Sommerso, Via G. Doria, 31 – 73100 Lecce, Italy 5: Associazione Salento Sommerso, Via G. Doria, 31 – 73100 Lecce, Italy; Museo di Storia Naturale del Salento, 73021 Calimera (Lecce); Via Giuseppe Doria, 31 – 73100 Lecce, Italy 6: Departamento de Biología, Facultad de Ciencias del Mar y Ambientales, Campus de Excelencia Internacional del Mar (CEIMAR), Universidad de Cádiz, Avenida República Saharaui s/n, Apdo. 40, 11510 Puerto Real (Cádiz), Spain; Instituto Universitario de Investigación Marina (INMAR), Campus de Excelencia Internacional del Mar (CEIMAR), Universidad de Cádiz, Avenida República Saharaui s/n, Apdo. 40, 11510 Puerto Real (Cádiz), Spain

Publication date: January 1, 2020

This article was made available online on September 19, 2019 as a Fast Track article with title: "Description of a new pseudocryptic species of Elysia Risso, 1818 (Heterobranchia, Sacoglossa) in the Mediterranean Sea".

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  • The Bulletin of Marine Science is dedicated to the dissemination of high quality research from the world's oceans. All aspects of marine science are treated by the Bulletin of Marine Science, including papers in marine biology, biological oceanography, fisheries, marine affairs, applied marine physics, marine geology and geophysics, marine and atmospheric chemistry, and meteorology and physical oceanography.
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