Ligiidae
The Ligiidae are a family of isopods, crustaceans that are adapted to living on land. Though they are often found near the sea, these isopods breathe through their gills and must retain moisture. They are more closely related to aquatic isopods than terrestrial isopods in the family Oniscidae. Ligiidae are found around the world, primarily on rocky coasts.
Common Names
Ligiidae are commonly known as "sea slaters" or "rock slaters." Other names include "beach slaters," "tide pool isopods," and "coastal isopods."
Characteristics
Ligiidae are typically elongated and flattened, with a segmented body. They range in size from a few millimeters to several centimeters long. They have seven pairs of legs, the first pair of which are modified into mouthparts.
Their most defining characteristic is their ability to curl up into a ball when threatened, protecting their vulnerable underside. This is a common defense mechanism among isopods.
Ligiidae have seven pairs of legs and two pairs of antennae. They are also distinguished by the presence of a "pleotelson," a terminal segment that projects beyond the last pair of legs.
Environments
Ligiidae are primarily found on rocky shores and in the intertidal zone, but can also be found further inland in damp environments.
They are often found under rocks, seaweed, and other debris, where they feed on decaying organic matter, algae, and small invertebrates.
Ligiidae are adapted to survive the harsh conditions of the intertidal zone, including fluctuating salinity, temperature changes, and periods of desiccation.