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Pediculosis pubis (also known as "crabs" and "pubic lice") is an infestation by the pubic louse, Pthirus pubis, a wingless insect which feeds on blood and lays its eggs (nits) on mainly pubic hair. Less commonly, hair near the anus, armpit, beard, eyebrows, moustache, and eyelashes may be involved.
Emerita is adept at burrowing, and is capable of burying itself completely in 1.5 seconds. [6] Unlike mud shrimp, Emerita burrows tail-first into the sand, using the pereiopods to scrape the sand from underneath its body. [12] During this action, the carapace is pressed into the sand as anchorage for the digging limbs. [12]
The shared use of burrows has enabled the evolution of symbiotic relationships between bioturbators and the many species that utilize their burrows. [23] [24] For example, gobies, scale-worms, and crabs live in the burrows made by innkeeper worms. [25] Social interactions provide evidence of co-evolution between hosts and their burrow symbionts.
Some of these areas always teem with crabs. Scientists count thousands. But in 2021, thousands dwindled to hundreds. "The survey last year was a huge red flag for me," she told Mashable.The ...
The carapace width of mature Dungeness crabs may reach 25 cm (9.8 in) in some areas off the coast of Washington, but are typically under 20 cm (7.9 in). [22] They are a popular delicacy , and are the most commercially important crab in the Pacific Northwest , as well as the western states generally. [ 23 ]
The sand crabs with soft shells that have just moulted are kept for bait, while the hard-shelled crabs are thrown back into the sea. [ 6 ] The sand crab has been evaluated as an indicator species for monitoring the level of domoic acid -synthesizing diatoms ( Pseudo-nitzschia spp.) which sometimes cause toxic blooms off the coast of California.
Fiddler crabs generally have very simple 10–40 cm “J-shaped” burrows, [29] while sesarmid crabs that burrow often create complex, branching burrows that can reach over 100 cm in depth. [27] Both types of crab significantly increase the surface area of the sediment and water/air interface to similar extents when scaled for relative ...
However, some do not travel to the water line as males remain to forage/ defend the burrows and females remain to select potential mates or to prepare their burrows for eggs. [11] As high tide returns, the crabs that traveled to the water line return to the high intertidal zone and either excavate burrows or improve on existing burrows.