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Tardigrades (/ ˈ t ɑːr d ɪ ɡ r eɪ d z / ⓘ), [1] known colloquially as water bears or moss piglets, [2] are a phylum of eight-legged segmented micro-animals. They were first described by the German zoologist Johann August Ephraim Goeze in 1773, who called them Kleiner Wasserbär ' little water bear ' .
The smallest penguin species is the little blue penguin (Eudyptula minor), which stands around 30–33 cm (12–13 in) tall and weighs 1.2–1.3 kg (2.6–2.9 lb). [74] The smallest bird of prey is the Black-thighed falconet (Microhierax fringillarius), with a wingspan of 27–32 centimetres (11–13 in), roughly the size of a sparrow. [75]
Symbion is a genus of commensal aquatic animals, less than 0.5 mm wide, found living attached to the mouthparts of cold-water lobsters. They have sac-like bodies, and three distinctly different forms in different parts of their two-stage life-cycle.
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The type species of the genus Mini, which are extremely small (8–15 mm (0.3–0.6 in)) frogs endemic to Madagascar, among the smallest vertebrates known to science. Mus bufo (Thomas, 1906) - family Muridae. The toad mouse, found in Burundi, Democratic Republic of the Congo, Rwanda, and Uganda.
Myxozoa (etymology: Greek: μύξα myxa "slime" or "mucus" [2] + thematic vowel o + ζῷον zoon "animal" [3]) is a subphylum of aquatic cnidarian animals – all obligate parasites. It contains the smallest animals ever known to have lived.
' flat animals ') [3] is a phylum of free-living (non-parasitic) marine invertebrates. [4] [5] They are blob-like animals composed of aggregations of cells. Moving in water by ciliary motion, eating food by engulfment, reproducing by fission or budding, placozoans are described as "the simplest animals on Earth."
Cyclops has a cosmopolitan distribution in fresh water, but is less frequent in brackish water. It lives along the plant-covered banks of stagnant and slow-flowing bodies of water, where it feeds on small fragments of plant material, animals (such as nematodes), or carrion. It swims with characteristic jerky movements.