Kingdom Animalia
Phylum Arthropoda
Class Crustacea
Order Isopoda
Family Oniscidae
Genus Ligia
Species italica
Classification Fabricius, 1798
Common name roach

Geographic Range it lives well on Mediterranean and eastern-Atlantic coasts.
Physical Characteristics oval body, flattened on the back and on the belly; it is about 12 millimeters long. It is a crustacean lacking of the calcareous carapace. It bears two big and sessile eyes, two pairs of long articulated antennas, one longer than the other, which reach one third of the total length of the body and five mouth processes. The first segment of the thorax is joined to the head. The thorax bears six abdominal processes: the first pair is transformed into jaws, while the others are used for walking. The abdomen bears processes or pleopods: the first 5 pairs work as gills, while the sixth bears two long symmetrical uropods. The telson is at the end of the abdomen. The ligia is dark brown with grey or greenish spots.
Notes it is common in the supralittoral zone of the sandy and rocky coasts; it always remains over the sea level. It is characterised mainly by diurnal activity; it moves on rocks and swims in the water, although it doesn't easily tolerates plunging. Breathing is branchial. Sexes are separated: eggs are incubated in a hollow formed from plates located on the thorax processes of the female. The larvae come out from the eggs which, after several moults, turn into adults.
Habitat it lives on the rocks and in the gorges of the supralittoral zone. It leaves that zone in order to look for food.
Food habits it is detrivorous; it feeds mainly on vegetable remains or on any other kind of organic material.

References Consejeria de Educación, Cultura y Deportes - Gobierno de Canarias
Web References http://www.educa.rcanaria.es/

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