Emerita analoga (Stimpson, ). Common name(s): Pacific sand crab, sand crab, mole crab. Synonyms: Hippa analoga, 3 cm preserved female. Scientific Name. Emerita analoga. Animal Type. Invertebrates. Diet. plankton, mostly dinoflagellates. Size. females: to 2 inches ( mm); males inches. Pacific Sand Crab (Mole Crab). Emerita analoga. Decapoda: Hippidae. Laguna Beach, Orange County, CA. 06/11/ © Peter J. Bryant. Back to Natural History.
|Published (Last):||13 April 2010|
|PDF File Size:||4.94 Mb|
|ePub File Size:||20.28 Mb|
|Price:||Free* [*Free Regsitration Required]|
Cool Facts If dislodged while feeding, sand crabs—in a manner most unusual for crustaceans—can swim or tread water by beating their back legs.
Emerita analoga – Wikipedia
Its eyes are on long stalks and its antennules are long enough that it can keep them above the surface even after it has burrowed backwards into the sand. The eyes are on long stalks and the antennules are also elongated so as to project above the surface of the sand. In both views the abdomen has been artificially extended.
The sea otter also consumes them. Join us to listen in on their emerta and feel free to interject when the discussion starts to go over your head. She carries them on her abdomen until the eggs hatch—about 30 days emeruta.
The bird maximizes its chance of feeding on sand crabs by scurrying at the edge of the surf. I am most frequently found on tidal sandy stretches of warm and sunny summertime beaches. Domoic acid—a naturally occurring toxin emeita by microscopic algae—causes serious amnesic poisoning in higher animals, including humans. University of California, Irvine.
Week # 5: Pacific Sand Crab, Emerita analoga – Wildcoast
Click Here for a movie of a 1. This Pacific Mole Crab sand crab is female based on the bright orange egg sac pictured here.
Between Pacific Tides 5th ed. How to Distinguish from Similar Species: Those trying to capture me are able to identify my location by looking for subtle clues along the beach. The sand crab is well adapted to life in the sand, which presents an unstable substrate, and its shape is an elongated-dome shape designed for fast burrowing.
The adult is sand-coloured and well camouflaged, and has no claws or spines. The Biology of Soft Shores and Estuaries.
Look carefully next time you are walking down the beach after the crash of a wave moves back to the ocean and you just might catch a glimpse of me while I am capturing food. Dorsal and ventral views of a preserved male, 2. The first 4 pereopods are flattened, not chelateand used for digging. Note that the normal gray color has faded because this is a preserved specimen.
This page was last edited on 10 Decemberat Journal of Plankton Research.
General Notes and Observations: Emerita has a barrel -shaped body. These are passed on to predators when the predators eat the crabs, and if enough worms are ingested, they have been known to kill the predator. The sand crab always analogw backwards when burrowing or crawling. Emerita analoga Stimpson, Common name s: It is found on exposed sandy beaches in the swash region meerita the intertidal zone. This makes it vulnerable to predatory birds such as the sanderling.
Due to the Emerita being the predominant diet of the barred surfperch, surf fisherman use sand crabs as bait.
Note the lack of pleopods on the abdomen. Because the fisheries throw back hard-shelled crabs, sand crab populations analiga been affected by bait fishing. Well camouflaged by its gray shell, a sand crab keeps its balance in the ever-moving sand with the help of a heavily armored, curved body and pointy legs.
Fishes, seabirds and shore birds are the main predators of sand crabs.
Week # 5: Pacific Sand Crab, Emerita analoga
The sand crab has been evaluated as an indicator species for monitoring the level of domoic acid -synthesizing diatoms Pseudo-nitzschia spp. Note how the carapace is egg-shaped and the animal keeps its legs and other appendages folded underneath, maintaining a 3-dimensional egg-like contour.
Emerita analogw a short lifespan, perhaps no more than two to three years, and can reproduce in its first year of life. The antennules form a tube though annaloga water is directed downwards into the gill chambers. It can do this several times per wave.