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Les cahiers naturalistes de l'Observatoire Marin_EN

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First record of the annelid Boccardia proboscidea Hartman, 1940 in Brittany (south-western channel, France)

Gully F. & Cochu M.

The annelid Boccardia proboscidea was observed repeatedly on the shore of northern Brittany (Trégor, Côtes-d'Armor, France), between November 2018 and March 2019. This species, considered as originating from the coasts of the Pacific Ocean, seems to have taken advantage of international maritime shipping to spread worldwide. The dispersal of the Breton sites where we observed the species, its locally high abundance together with the presence of eggs suggest that the species is steadily established in Brittany.

Keywords: Boccardia proboscidea; Côtes-d'Armor; introduced species; Northern Brittany; Spionidae

First online: 17th July 2019


First record of the non-indigenous Isopoda Synidotea laticauda Benedict, 1897 in the Seine Estuary (Normandy, France)

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

The northeastern Pacific isopod Synidotea laticauda Benedict, 1897 is reported for the first time in the French part of the English Channel. Specimens have been found in 2017 in a pebble habitat of the Seine Estuary (Normandy, France). Its occurrence in the Seine Estuary is probably related to international maritime traffic, which is important around the major seaports of the Seine Estuary: Le Havre and Rouen.

Keywords: isopod; non-indigenous species; Seine Estuary

First online: 25th May 2019


Occurrence of Ammothea hilgendorfi (Böhm, 1879) a pycnogonid from the north Pacific, in Étel river

Le Roux A., Gélinaud G., Le Bail Y., Monnat J.-Y., Morel J.-Y., Paraire O. & Ros J.

The pycnogonid Ammothea hilgendorfi from the north Pacific was introduced accidentaly to Europe where it is known from Southern England, Netherlands and the Venice lagoon. It was collected in rivière d'Étel, South Brittany (47°40'N 3°11'W) where it forms a locally dense population. This species was actively reproducing in late September and mid November. It is carnivorous, may be a scavenger and manifests a gregarious behaviour at least at low tide. It is likely to have a significant impact on its host environment due to its high density population. Its probable further spreading deserves to be monitored.

Keywords: alien species; Ammothea hilgendorfi; Étel river; pycnogonids

First online: 3rd November 2020

Assessment of the presence of Gracilipurpura rostrata (Gastropoda: Fasciolariidae) along the northern coasts of Brittany (France)

Le Garrec V.

One specimen of Gracilipurpura rostrata (Olivi, 1792) was found in Penvénan (Northern Brittany), an intermediate site between two bays where this mediterranean introduced species had been already recorded. We precise here the ecology of the species, and discuss the primary and secondary vectors of the spread of the species along the coasts of northern Brittany.

Keywords: Fasciolariidae; introduced species; northern Brittany

First online: 6th March 2020


One-step beyond: northernmost record of Berghia verrucicornis (Costa, 1867)

Droual G. & Bridier G.

The nudibranch Berghia verrucicornis (Costa, 1867) was sampled during a citizen science survey along the Brittany coast as part of a macrofaunal species monitoring in the intertidal area. This note reports for the first time the occurrence of B. verrucicornis in Brittany. In addition, it is also the northernmost record for this species. Its distributional range is thereby increased by 200 km to the north.

Keywords: Berghia verrucicornis; Brittany; citizen science; new record; nudibranch

First online: 12th August 2020