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Family Talitridae - Beach Hoppers

jumping crustacean thing found under some soggy leaves on a redwood deck.   - Arcitalitrus sylvaticus Amphipod - Americorchestia longicornis Americorchestia longicornis Americorchestia longicornis Beach Hopper Megalorchestia - Megalorchestia californiana large beach hoppers - Americorchestia Cal Poly Pamona, Kellog West hotel, dozens on the bathroom floor...all were dead.  About 5mm long. - Arcitalitrus sylvaticus
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Crustacea (Crustaceans)
Class Malacostraca (Malacostracans)
Superorder Peracarida (Peracarida (Amphipods and Isopods))
Order Amphipoda (Amphipods)
Suborder Senticaudata
Family Talitridae (Beach Hoppers)
Other Common Names
Sand hoppers, sand fleas, lawn shrimp, land hoppers
Habitat
They live near or above the high water mark. During the day they mostly shelter in burrows in the sand or under seaweed washed ashore but at night they hop around in search of detritus (comment here).
Remarks
Males have a large second gnathopod.