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Crustacea is our planet we must fight censorship!
> Crustaceans (Crustacea /krʌˈsteɪʃə/) form a very large group of arthropods, usually treated as a subphylum, which includes such familiar animals as crabs, lobsters, crayfish, shrimp, krill and barnacles.
> The 67,000 described species range in size from Stygotantulus stocki at 0.1 mm (0.004 in), to the Japanese spider crab with a leg span of up to 3.8 m (12.5 ft) and a mass of 20 kg (44 lb). Like other arthropods, crustaceans have an exoskeleton, which they moult to grow. They are distinguished from other groups of arthropods, such as insects, myriapods and chelicerates, by the possession of biramous (two-parted) limbs, and by their larval forms, such as the nauplius stage of branchiopods and copepods.
> Crustaceans have a rich and extensive fossil record, which begins with animals such as Canadaspis and Perspicaris from the Middle Cambrian age Burgess Shale.[40][41] Most of the major groups of crustaceans appear in the fossil record before the end of the Cambrian, namely the Branchiopoda, Maxillopoda (including barnacles and tongue worms) and Malacostraca; there is some debate as to whether or not Cambrian animals assigned to Ostracoda are truly ostracods, which would otherwise start in the Ordovician.[42]
> The only classes to appear later are the Cephalocarida,[43] which have no fossil record, and the Remipedia, which were first described from the fossil Tesnusocaris goldichi, but do not appear until the Carboniferous.[44] Most of the early crustaceans are rare, but fossil crustaceans become abundant from the Carboniferous period onwards.[40]
>A heap of small pink lobsters on their sides, with their claws extended forwards towards the camera.
>Norway lobsters on sale at a Spanish market
> Within the Malacostraca, no fossils are known for krill,[45] while both Hoplocarida and Phyllopoda contain important groups that are now extinct as well as extant members (Hoplocarida: mantis shrimp are extant, while Aeschronectida are extinct;[46] Phyllopoda: Canadaspidida are extinct, while Leptostraca are extant[41]). Cumacea and Isopoda are both known from the Carboniferous,[47][48] as are the first true mantis shrimp.[49]
> In the Decapoda, prawns and polychelids appear in the Triassic,[50][51] and shrimp and crabs appear in the Jurassic;[52][53] however, the great radiation of crustaceans occurred in the Cretaceous, particularly in crabs, and may have been driven by the adaptive radiation of their main predators, bony fish.[53] The first true lobsters also appear in the Cretaceous.[54]
> Krill are small crustaceans of the order Euphausiacea, and are found in all the world's oceans. The name krill comes from the Norwegian word krill, meaning "small fry of fish",[1] which is also often attributed to species of fish.
> Krill are considered an important trophic level connection – near the bottom of the food chain – because they feed on phytoplankton and to a lesser extent zooplankton, converting these into a form suitable for many larger animals for whom krill makes up the largest part of their diet. In the Southern Ocean, one species, the Antarctic krill, Euphausia superba, makes up an estimated biomass of around 379,000,000 tonnes,[2] making it among the species with the largest total biomass. Of this, over half is eaten by whales, seals, penguins, squid and fish each year, and is replaced by growth and reproduction. Most krill species display large daily vertical migrations, thus providing food for predators near the surface at night and in deeper waters during the day.
>Krill is also the main prey of baleen whales, including the blue whale.
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>Be wary of surgically enhanced operatives that may look like us but can never be one of us!
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