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A chaeta or cheta (from Ancient Greek χαίτη (khaítē) 'crest, mane, flowing hair'; pl. chaetae) is a chitinous bristle or seta found on annelid worms, although the term is also frequently used to describe similar structures in other invertebrates such as arthropods.
Polychaeta (/ ˌ p ɒ l ɪ ˈ k iː t ə /) is a paraphyletic [1] class of generally marine annelid worms, commonly called bristle worms or polychaetes (/ ˈ p ɒ l ɪ ˌ k iː t s /).Each body segment has a pair of fleshy protrusions called parapodia that bear many bristles, called chaetae, which are made of chitin.
Crustaceans have mechano- and chemosensory setae. [3] Setae are especially present on the mouthparts of crustaceans [3] and can also be found on grooming limbs. [4] In some cases, setae are modified into scale like structures. [4] Setae on the legs of krill and other small crustaceans help them to gather phytoplankton. It captures them and ...
Bacteriastrum is a widely distributed marine, planktonic genus. This genus is often associated with Chaetoceros but differs in radial symmetry and fenestration of setae. The colonies tend to lie in girdle view, and the cells are separated by the curvature of the basal part of the setae, leaving a small gap between the cells.
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Two distinguishing features are the opercular whorl and the chaetae forming a collar. [3] The tube is white and chalky, about fifty milliimetres long and two millimetres wide. It is thin walled with many curved growth lines on the sides. The surface is smooth and often has distinct growth rings. The tube meanders irregularly over the substrate. [4]
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