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Les cahiers naturalistes de l'Observatoire Marin_EN

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New occurence of Centroceras clavulatum (Agardh) Montagne on the coast of Brittany

Le Duff M., Le Garrec V. & Ar Gall E.

The presence of Centroceras clavulatum is reported for the first time in the Western Channel, off Bréhat island. We hypothesize and discuss that its presence is linked with the oyster farming activities.

Keywords: Centroceras clavulatum; northern Brittany; oyster farming


First record of the non-indigenous species Neomysis americana (Crustacea: Mysidacea) in the Seine estuary (Normandy, France)

Massé C., Chouquet B., Dubut S., Durand F., Gouillieux B. & Dancie C.

The mysid Neomysis americana (S.I. Smith, 1873), native from the East coast of North America, was recorded for the first time in European waters in The Netherlands 8 years ago. This species was observed for the first time on the French coast in the Seine estuary (Normandy) in 2017. As for The Netherlands, this species has probably been introduced on the French coast by shipping in ballast waters.

Keywords: mysidae; non-indigenous species; Seine estuary


First record of the non-native species Grandidierella japonica Stephensen, 1938 (Crustacea: Amphipoda: Aoridae) along the French Basque coast

Foulquier C., Bogun, F., Gouillieux B, Lavesque N. & Blanchet H.

The non-native species Grandidierella japonica Stephensen, 1938 is reported for the first time along the French Basque Country. Specimens were collected in 2015, 2016 and 2017 from the Figuier Bay and the Nivelle and Adour estuaries. This amphipod, native to the Sea of Japan, may have been introduced along the French Basque Country with recreational boats from Hossegor lagoon or Arcachon Bay and/or with international shipping.

Keywords: Adour estuary; amphipod; Aorid; exotic species; Figuier Bay; French Basque country; Grandidierella japonica; international shipping; Nivelle estuary; recreational boats


First record of the gastropod Gibbula albida (Gmelin, 1791) on the Finistère coasts (western Brittany)

Le Duff M., Le Garrec V. & Ar Gall E.

The first record of the non-indigenous species Gibbula albida in Finistère coastal waters (west Brittany) is reported. Two specimens together with seven empty shells were found within a muddy-sand-gravel habitat at mid-level of the intertidal area, in the western part of the bay of Morlaix. This is the first record of G. albida in Finistère waters as the species originating from the eastern Mediterranean, has been known from many years to live in the gulf of Morbihan (south Brittany) as well as from north Brittany shores (Bay of Saint-Brieuc).

Keywords: Finistère; Gibbula albida; northern Brittany


First record of the aeolid nudibranch Trinchesia genovae (O'Donoghue, 1926) in Brittany (France)

Droual G.

Described in Italy and considered as a Mediterranean species, the aeolid nudibranch Trinchesia genovae (O'Donoghue, 1926) is reported for the first time in Brittany (north-west coast of France) in a maerl sample. This record confirms the occurrence of this species between Ireland and the Bay of Arcachon (France), where T. genovae has been previously identified, filling an important biogeographical gap in the Atlantic waters.

Keywords: aeolid; Brittany (north-west coast of France); new record; Nudibranch; Trinchesia genovae