Ligia exotica

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An isopod belonging to the family Ligiidae found on the rocky coasts, jetties, and harbor walls, and commonly called as sea roach or wharf roach


Ligia exotica is a species belonging to the family Ligiidae. It is commonly found inhabiting the rocky coasts and harbor walls. Similar to other isopods, this species has a body that is covered with segmented exoskeleton. It can grow up to 1.6 inches in length. The male is bigger than the female. It also has two pairs of antenna attached on its head. The antennae are longer than the length of its body. Its body is dorsally flattened and dark gray in colour. Its appendages are pale brown. The thorax has seven thoracic segments wherein each segment has a pair of jointed limbs. The abdominal region has six segments. The first five pairs of appendages at the abdominal region have flat membranous gills, which are used for respiration (or gas exchange). The sixth abdominal segment has a pair of forked uropods.

Ligia exotica feed on microalgae and diatoms. They may also scavenge on detritus and plant remains.

Scientific classification:

  • Kingdom: Animalia
  • Phylum: Arthropoda
  • Subphylum: Crustacea
  • Class: Malacostraca
  • Order: Isopoda
  • Family: Ligiidae
  • Genus: Ligia
  • Species: L. exotica

Common name(s):

  • sea roach
  • wharf roach

See also: