Sacculina carcini is a species of barnacles in the family Sacculinidae. They are native to the Palearctic and Atlantic Ocean. They are carnivores. Individuals can grow to 26 mm. They are sessile animals.
Definition: overall repetitive or reflective pattern in the body of one individual of this taxon. eg: bilateral symmetry, rotational symmetry, radial symmetry
Definition: A group of species that exploit the same food resources, and/or use the same feeding or foraging methods. http://en.wikipedia.org/wiki/Guild_(ecology)