Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada
Clickable Guide
Moths Butterflies Flies Caterpillars Flies Dragonflies Flies Mantids Cockroaches Bees and Wasps Walkingsticks Earwigs Ants Termites Hoppers and Kin Hoppers and Kin Beetles True Bugs Fleas Grasshoppers and Kin Ticks Spiders Scorpions Centipedes Millipedes

Upcoming Events

See Moth submissions from National Moth Week 2023

Photos of insects and people from the 2022 BugGuide gathering in New Mexico, July 20-24

Photos of insects and people from the Spring 2021 gathering in Louisiana, April 28-May 2

Photos of insects and people from the 2019 gathering in Louisiana, July 25-27

Photos of insects and people from the 2018 gathering in Virginia, July 27-29

Photos of insects and people from the 2015 gathering in Wisconsin, July 10-12

Previous events


Species Ligia oceanica - European Seaslater

Oniscidea - Ligia oceanica
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Crustacea (Crustaceans)
Class Malacostraca (Malacostracans)
Superorder Peracarida (Marsupial Crustaceans)
Order Isopoda (Isopods)
No Taxon (Scutocoxifera)
Suborder Oniscidea (Woodlice)
Infraorder Diplocheta
Family Ligiidae (Seaslaters and Rockslaters)
Genus Ligia (Seaslaters)
Species oceanica (European Seaslater)
Other Common Names
Common Sea Slater
Explanation of Names
Author of species is Linnaeus 1767
up to 30 mm
Oval shaped, dorso-ventrally flattened body that is twice as long as broad. The antennae are approximately two thirds the length of the body; at least 10 segments on antennal flagellum. Seven externally visible thoracic segments. Seven pairs of walking legs. Two large uropods project from the posterior margin of the telson, each with two long processes or rami. Very large and obvious black eyes. Body color is gray to olive.
native to w. Europe, adventive in NA (ne. US: ME-MA)(1)
rocky coasts under stones and in crevices
Life Cycle
Mature by one year of age, but in most cases breeding will not begin until the sea slater is at least two years old. Breeding takes place in spring and summer. Most individuals only breed once, and have a life span of around two and a half to three years.
Internet References
Fact sheets (from UK): ARKive, MarLIN
Works Cited
1.Checklist of the terrestrial isopods of the New World (Crustacea, Isopoda, Oniscidea)
Leistikow A., Wägele J.W. 1999. Rev. Bras. Zool. 16: 1‒72.