A new record of the freshwater jellyfish Craspedacusta sowerbii in northern Chilean Patagonia is reported. The specimens were collected from Laguna Illahuapi, an oligotrophic shallow lake (15 m maximum depth) in early austral autumn, May 2013. This water body is located in the upper zone of the Rio Bueno basin, Province of Ranco, Region de los Ríos, Chile. The region is characterized by a great diversity of freshwater environments with minimal human pressure. This report confirms the presence of C. sowerbii in Chilean Patagonia and represents the southernmost range of distribution of this exotic medusa in South America. This study also contributes additional information on the limnological characterization of this water body.

During two benthic research cruises carried out by AZTI-TECNALIA, two specimens of the spionid Paraprionospio coora Wilson, 1990 were collected. The genus Paraprionospio had not been previously reported from the Bay of Biscay, while the species P. coora is reported for the first time from the Atlantic Ocean. The specimens were found in circalittoral soft bottoms of the continental shelf of Basque coast (SE Bay of Biscay). In this paper, morphological descriptions, photographs, comments on the habitat, and geographical distribution of this species were provided.

The freshwater cladoceran Bosmina coregoni (Baird, 1857), native to Eurasia, has established and spread in the Great Lakes region of North America since the 1960s. Here we report the first detection of B. coregoni on the Pacific coast of North America, in three geographically distinct locations: the Lower Columbia River Estuary (LCRE), Lake Washington in western Washington state, and the Columbia River Basin in south eastern Washington state. Bosmina coregoni was detected on multiple sampling dates in Lake Washington and the LCRE between 2008 and 2012.

The Pacific brown-banded sea-spider Ammothea hilgendorfi has been introduced to Venice (Mediterranean Sea: 1979–1981) and south England (NE-Atlantic: 1978). From the Channel Coast of south England it has spread to the southern North Sea Coast (Blackwater Estuary, Essex). The present paper reports further dispersal across the North Sea to the Atlantic coast of the European continent.

The round goby Neogobius melanostomus (Pallas, 1814), a Ponto-Caspian gobiid species, was recorded for the first time in the Elbe River, Germany in May 2008. Between then and June 2013, 22 records comprising 36 specimens of N. melanostomus have been collected from the Elbe River, mainly in the tidal river section of the city of Hamburg.

The presence of the Iberian barbel Luciobarbus graellsii is recorded for the first time in the Tiber River (Central Italy). Because of its abundance at the sampling site and the presence of different size classes we assume that the species is established. Introduction of the allochthonous species is probably due to illegal release by local anglers. We suggest monitoring the expansion of the species to assess the impact on native species and the risk of hybridization and competition with the endemic Barbus tyberinus.

The invasive, biofouling, Conrad’s false mussel Mytilopsis leucophaeata was first recorded in Sweden during spring 2011 in the cooling water system of the power plant of Forsmark in the southern Bothnian Sea. The cooling water discharge area offers a favourable environment for growth, survival, and reproduction of M. leucophaeata and may provide a stepping stone for further spread. We present three different studies in the area, revealing a rapid increase in mussels in the artificially heated area, with densities of the magnitude of thousands of individuals m-2, as well as mussels living in surrounding waters, indicating an on-going expansion in the region.

A specimen of the swimming crab Scylla serrata, a species native to the tropical Indo-West and South Pacific, is reported from Cartagena Bay, Colombia, in the southern Caribbean. It is the third alien decapod crustacean documented from the Caribbean coast of Colombia. Analyses of genetic sequences points to a northern Indian Ocean origin of this specimen. Presence of this specimen is considered an isolated case, most likely kept alive for human consumption on board ship and discarded in the Bay. .

A specimen of the cepheid scyphozoan Marivagia stellata Galil and Gershwin, 2010, described from the Mediterranean coast of Israel, is here reported from Kerala, on the southwestern coast of India. The present record establishes M. stellata as the fourth scyphozoan species introduced to the Mediterranean through the Suez Canal.

The alien Erythraean jellyfish Rhopilema nomadica was first recorded in Tunisia waters (Gulf of Gabes) in 2008. Subsequently it was sighted in the Bizerte Channel and Gulf of Tunis where it has been regularly observed since 2010 during summer and autumn months.

Between June 2012 and January 2013, nine specimens of the giant tiger shrimp Penaeus monodon Fabricius, 1798 were caught off the Mexican Gulf coast. The average total length of these specimens was 28.1 cm. This is the first record of this invasive shrimp on the Mexican Gulf coast. The appearance of this shrimp species is a concern because of the effects it could produce on the Gulf coast ecosystem.