Chaetae (singular chaeta) are bristles or seta found on annelid worms such as the earthworm. They are also often spelled chetae (or cheta for the singular). A seta is a stiff hair, wierd, culy, things bristle, or bristle-like process or part of an organism. ... Classes and subclasses Class Polychaeta (paraphyletic?) Class Clitellata Oligochaeta- (Earthworms, etc. ... Families Suborder Haplotaxina Haplotaxidae Suborder Moniligastrina Moniligastridae Suborder Lumbricina Alluroididae Eudrilidae Glossoscolecidae Lumbricidae Sparganophilidae Acanthodrilidae Octochaetidae Exxidae Megascolecidae Microchaetidae Eudrilidae Suborder Tubificina Dorydrilidae Enchytraeidae Naididae Opistocystidae Phreodrilidae Tubificidae Earthworm is the common name for the larger members of the Oligochaeta (which is either a class or subclass depending on the...
In the polychaeta they are located on the parapodia. They consist of two sets in Hediste diversicolor (=Nereis diversicolor), one below the dorsalcirrus on the notopodium and another above the ventral cirrus on the neuropodium. Orders Amphinomida Capitellida Chaetopterida Cirratulida Cossurida Ctenodrillidae Eunicida Flabelligerida Magelonida Myzostomida Nerillida Opheliida Orbiniida Orweniida Phyllodocida Pisionidae Polygordiida Protodrilida Psammodrilidae Sabellida Spionida Spintheridae Sternaspida Terebellida The Polychaeta or Polychaetes are a class of annelid worms, generally marine, with a pair of fleshy protrusions on each body segment called parapodia that... The word dorsal can refer to many different things. ... Cirrus can refer to: a type of cloud, cirrus cloud a car produced by DaimlerChrysler, Chrysler Cirrus a German rocket, cirrus (rocket) a trance music group, Cirrus (music group) an interbank network (ATM network) by MasterCard, Cirrus (interbank network) a British aircraft engine company, Cirrus Engine an aircraft company, Cirrus... In zootomy, several terms are used to describe the location of organs and other structures in the body of bilateral animals. ...
Chaetae are present on every segment, except the first and last, and are embedded in chaetigerous sacs, which are ingrowths of the epidermis, each chaeta being secreted by a single cell at the base of the sac.
Chaetae are involved in the locomotion of the worm and this can be illustrated by allowing a worm to move over a piece of rough paper and then a sheet of glass.
The ordinary chaetae are elongated bright yellow objects, rather fusiform in shape with the thickest portion in the middle.
Chaetae are small chitinous bristles emerging from pores in the integument on the ventral half of the worm.
The chaetae are used as anchors when burrowing to hold parts of the worm against so that elongation of the animal results in controlled, usually forward, motion.
The chaetae are retractile and they may be withdrawn in some, or even all, of the segments of the worm.
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