Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada

Clickable Guide

Interactive image map to choose major taxa 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

Calendar

Upcoming Events

National Moth Week was July 19-27, and the Summer 2025 gathering in Louisiana, July 19-27

Photos of insects and people from the 2024 BugGuide gathering in Idaho July 24-27

Moth submissions from National Moth Week 2024

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


Species Armases cinereum - Squareback Marsh Crab

Representative Images

Mangrove Tree Crab - Armases cinereum Mangrove Tree Crab - Armases cinereum Mangrove Tree Crab - Armases cinereum Squareback marsh crab? - Armases cinereum Square-backed Marsh Crab? - Armases cinereum Square-backed Marsh Crab? - Armases cinereum Squareback Marsh Crab - Armases cinereum Squareback Marsh Crab - Armases cinereum

Classification

Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Crustacea (Crustaceans)
Class Malacostraca (Malacostracans)
Superorder Eucarida (Eucarida (Crabs, Crayfish, Shrimp, etc.))
Order Decapoda (Crabs, Crayfishes, Lobsters, Prawns, and Shrimp)
Infraorder Brachyura (True Crabs)
Family Sesarmidae
Genus Armases
Species cinereum (Squareback Marsh Crab)

Other Common Names

Wharf Crab

Synonyms and other taxonomic changes

Sesarma cinereum

Explanation of Names

Author: Bosc, 1802