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The body of a crustacean is composed of segments, which are grouped into three regions: the cephalon or head, [5] the pereon or thorax, [6] and the pleon or abdomen. [7] The head and thorax may be fused together to form a cephalothorax , [ 8 ] which may be covered by a single large carapace . [ 9 ]
This is an accepted version of this page This is the latest accepted revision, reviewed on 25 January 2025. Organisms living in water or air that are drifters on the current or wind This article is about the marine organisms. For other uses, see Plankton (disambiguation). Marine microplankton and mesoplankton Part of the contents of one dip of a hand net. The image contains diverse planktonic ...
Microfauna (from Ancient Greek mikros 'small' and from Latin fauna 'animal') are microscopic animals and organisms that exhibit animal-like qualities and have body sizes that are usually <0.1mm. [1] [2] Microfauna are represented in the animal kingdom (e.g. nematodes, small arthropods) and the protist kingdom (i.e. protozoans). A large amount ...
[Note 1] The term is also occasionally extended to colloquial names for freshwater or marine crustaceans (e.g., Balmain bug, Moreton Bay bug, mudbug) and used by physicians and bacteriologists for disease-causing germs (e.g., superbugs), [30] but entomologists reserve this term for a narrow category of "true bugs", insects of the order Hemiptera.
The silverfish is a nocturnal insect typically 13–25 mm (0.5–1.0 in) long. [3] Its abdomen tapers at the end, giving it a fish-like appearance. [4] The newly hatched are whitish, but develop a greyish hue and metallic sheen as they get older. [5]
In their larval stage, they attach to various animals, including humans, and feed on skin, often causing itching. These relatives of ticks are nearly microscopic, measuring 400 μm (1/60 of an inch) and have a chrome-orange hue. [9] [10] There is a marked constriction in the front part of the body in the nymph and adult stages.
A tiny, curious-looking, bug-eyed orange fish has popped up at several locales this summer at the Jersey Shore, begging many to take to social media to ask what it is.
Microscopic adult marine crustaceans include some copepods, cladocera and tardigrades (water bears). Some marine nematodes and rotifers are also too small to be recognised with the naked eye, as are many loricifera , including the recently discovered anaerobic species that spend their lives in an anoxic environment.