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.
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The crabs are hosts to the intermediate stages of various parasitic worms. Natural History of Orange County, California. Retrieved from ” https: Fishes, seabirds and shore birds are the main predators of sand crabs. The sand crab has been evaluated as an indicator species for monitoring the level of domoic acid -synthesizing diatoms Pseudo-nitzschia spp.
From Wikipedia, the free encyclopedia. After the wave retreats, the antennae are quickly coiled and retracted into the body.
Other birds that eat sand crabs include willetsgodwitssurf scotersblackbellied ploversand emreita. Authors and Editors of Page: Photos by Dave Cowles.
Week # 5: Pacific Sand Crab, Emerita analoga
Emerita has a barrel -shaped emerjta. The genus as a whole has a broad distribution in tropical and subtropical regions. The fifth pereopod is slender and chelateand is used for cleaning the gills rather than for digging.
The Old World species had been widely thought to form a monophyletic groupas did the New World species. A female may produce as many as 45, emedita. This page was last edited on 10 Decemberat The abdomen with its elongated telson photo is generally held reflexed underneath the thoraxbut is extended for rapid digging into the sand movie.
Why should humans care about me? 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 anwloga and pointy legs.
The barred surfperch Amphistichus argenteusfound off the coast of California, consumes a large number of sand crabs.
Week # 5: Pacific Sand Crab, Emerita analoga – Wildcoast
The Biology of Soft Shores and Estuaries. This female is carrying eggs see photo below. Emerita analogathe Pacific sand crab or Pacific mole crabis a species of small, sand-burrowing decapod crustacean found living in the sand along the temperate western coasts of North and South America. The panel with then work together to find a more accessible way to explain the subject matter.
Conservation Fishes, seabirds and shore birds are the main predators of sand crabs. Within a wave or two it will again pop up and ride the wave to a new spot; thus remaining in the swash zone as the tide advances and retreats along the beach. The female lays batches of up to 45, eggs each month and carries them about beneath her abdomen tucked emmerita her telson. A closeup view of the head of the 3 cm carapace length preserved female.
Emerita analoga Stimpson, Common name s: As each wave retreats, it extends its antennae and catches floating organisms. It has a tough exoskeleton and can hold its appendages close analooga the body, allowing it to roll in the tidal currents and waves. Emerita anloga adept at burrowing, and is capable of burying itself completely in 1. Domoic ana,oga naturally occurring toxin produced by microscopic algae—causes serious amnesic poisoning in higher animals, including humans.
Sand crab, Beaches & Dunes, Invertebrates, Emerita analoga at the Monterey Bay Aquarium
How to Distinguish from Similar Species: Sand crabs feed in the swash zone—an area of breaking waves. Bulletin of Zoological Nomenclature. Males are typically smaller than emeeita, and in some species, such as Emerita rathbunaethe minute males live attached to the legs of the female.
Natural History No bigger than a thumb, a sand crab spends most of its time buried in shifting sand. It differs from the spiny mole crab, Blepharipoda occidentalis analooga, which has spines on its carapace and pereopods and typically lives lower in the swash zone in California. Alaska but rarely north of Oregon to Chile; Argentina. On any particular beach, the distribution of sand crabs from one part to another can vary greatly for reasons not properly understood.
As a receding wave flows over them, the sand crabs uncoil a second pair of featherlike antennae and sweep them through the water to filter out tiny plankton. Its legs and uropods have hairy margins for rapid digging analiga the sand, for filtering food and transferring it to the mouth. It appears temporarily on Washington beaches mainly after warm events such as El Nino years.
Hippa analoga Stimpson, It can do this several times per wave. Algal blooms, which will be covered in a future Get to Know Your Neighbor Segmentare linked with the runoff of fertilizers used by humans.
Because the fisheries throw back hard-shelled crabs, sand crab populations haven’t been affected by bait fishing. The zoeal stages last up to days. In some znaloga, sand crabs are eaten as a popular snack, such as in Thailand and parts of India.
This movement happens very quickly, allowing the crabs to gather food several times in one receding wave. Inhabit the swash zone where the waves sweep up the beach and then retreat again.
Here only one is being retracted. While most crabs move in any direction—forward, backward and sideways—a sand crab moves only backward.
To feed, the crabs burrow backward into the sand and face seaward, with only their eyes and first antennae showing.