Idotea balthica, is a marine isopod which lives on seaweed

Seaweed

Seaweed is a loose, colloquial term encompassing macroscopic, multicellular, benthic marine algae. The term includes some members of the red, brown and green algae...

 on rocky shores along the European

Europe

Europe is, by convention, one of the world's seven continents. Comprising the westernmost peninsula of Eurasia, Europe is generally 'divided' from Asia to its east by the watershed divides of the Ural and Caucasus Mountains, the Ural River, the Caspian and Black Seas, and the waterways connecting...

 coastlines. You can find it in subtidal zone, feeding on algae

Algae

Algae are a large and diverse group of simple, typically autotrophic organisms, ranging from unicellular to multicellular forms, such as the giant kelps that grow to 65 meters in length. They are photosynthetic like plants, and "simple" because their tissues are not organized into the many...

.

Distribution

Belgian Exclusive Economic Zone, Great Britain

Great Britain

Great Britain or Britain is an island situated to the northwest of Continental Europe. It is the ninth largest island in the world, and the largest European island, as well as the largest of the British Isles...

, Cobscook Bay

Cobscook Bay

Cobscook Bay is located in Washington County in the state of Maine. It opens into the Bay of Fundy immediately south of the city of Eastport and adjacent to Passamaquoddy Bay...

, Dutch Exclusive Economic Zone, European

Europe

Europe is, by convention, one of the world's seven continents. Comprising the westernmost peninsula of Eurasia, Europe is generally 'divided' from Asia to its east by the watershed divides of the Ural and Caucasus Mountains, the Ural River, the Caspian and Black Seas, and the waterways connecting...

 waters, Greek

Greece

Greece , officially the Hellenic Republic , and historically Hellas or the Republic of Greece in English, is a country in southeastern Europe....

 Exclusive Economic Zone, Gulf of Maine

Gulf of Maine

The Gulf of Maine is a large gulf of the Atlantic Ocean on the east coast of North America.It is delineated by Cape Cod at the eastern tip of Massachusetts in the southwest and Cape Sable at the southern tip of Nova Scotia in the northeast. It includes the entire coastlines of the U.S...

, Knokke

Knokke

Knokke is one of a group of communities that are all grouped in the administrative community Knokke-Heist, in the province of West Flanders in Flanders, Belgium. Knokke itself has 15,653 inhabitants .Knokke-Heist has 33,818 inhabitants ....

, North West Atlantic, Red Sea

Red Sea

The Red Sea is a seawater inlet of the Indian Ocean, lying between Africa and Asia. The connection to the ocean is in the south through the Bab el Mandeb strait and the Gulf of Aden. In the north, there is the Sinai Peninsula, the Gulf of Aqaba, and the Gulf of Suez...

, Voordelta

Voordelta

The Voordelta is the coastal area in the North Sea, protected under under Natura-2000. It is located to the west of the South Holland and Zeeuws Islands, around the deltas of Haringvliet, Grevelingen, and Oosterschelde. The total area of Voordelta is about 900 km².-Sourse:*...

, West Coast of Norway

Norway

Norway , officially the Kingdom of Norway, is a Nordic unitary constitutional monarchy whose territory comprises the western portion of the Scandinavian Peninsula, Jan Mayen, and the Arctic archipelago of Svalbard and Bouvet Island. Norway has a total area of and a population of about 4.9 million...

, Wimereux

Wimereux

Wimereux is a commune in the Pas-de-Calais department in the Nord-Pas-de-Calais region of France.-Geography:Wimereux is a coastal town situated some north of Boulogne, at the junction of the D233 and the D940 roads, on the banks of the river Wimereux. The river Slack forms the northern boundary of...

, Black Sea.

Characteristics

The male

Male

Male refers to the biological sex of an organism, or part of an organism, which produces small mobile gametes, called spermatozoa. Each spermatozoon can fuse with a larger female gamete or ovum, in the process of fertilization...

 is larger than female

Female

Female is the sex of an organism, or a part of an organism, which produces non-mobile ova .- Defining characteristics :The ova are defined as the larger gametes in a heterogamous reproduction system, while the smaller, usually motile gamete, the spermatozoon, is produced by the male...

, reach 4 cm long. The color of the carapax is yellow, brown or green with small white spots; female

Female

Female is the sex of an organism, or a part of an organism, which produces non-mobile ova .- Defining characteristics :The ova are defined as the larger gametes in a heterogamous reproduction system, while the smaller, usually motile gamete, the spermatozoon, is produced by the male...

 usually darker. The species can be distinguished from other idoteids

Idoteidae

Idoteidae is a family of isopod crustaceans. It includes the following genera:*Austridotea Poore, 2001*Batedotea Poore & Lew Ton, 1993*Cleantiella Richardson, 1912*Colidotea Richardson, 1899*Crabyzos Bate, 1863...

 by the shape of the telson

Telson

The telson is the last division of the body of a crustacean. It is not considered a true segment because it does not arise in the embryo from teloblast areas as do real segments. It never carries any appendages, but a forked "tail" called the caudal furca is often present. Together with the...

. The telson

Telson

The telson is the last division of the body of a crustacean. It is not considered a true segment because it does not arise in the embryo from teloblast areas as do real segments. It never carries any appendages, but a forked "tail" called the caudal furca is often present. Together with the...

dorsally keeled with straight sides; has the distinct spine of the ends.

Sourse

• Baltic Isopod
• Idotea balthica in WoRMS
• Idotea balthica