carcinoscorpius rotundicauda crab laying upside down

animal aquatic arthropod arthropods background beach biology brackish brown carcinoscorpius chelicerate closeup crab crawl creature crustacean dishes food fossil gigas horseshoe lay limuldae mangrove marine nature ocean rotundicauda round-tailed rountundicauda sand sandy sea seashore seaside shell shellfish spines spiny tachypleus tail tropical underwater upsidedown water white wild wildlife xiphosura life