Collected from British Columbia (Canada) central coast in August. Preserved in ethanol. Need ID to genus, but not sure if that is possible via photos. Thanks in advance.
I know that maybe is too late, but it is a talitrid close to genus orchestia, as David said maybe is from the genus Americorchestia, Hyalella is more a freshwater amphipod, and antenna 1 is longer than peduncle.