Chaeta

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Related to chaetae: setae

chaeta

[′kēd·ə]
(biology)

Chaeta

 

one of numerous movable hairlike pectinate or hooked protuberances of the cuticle in invertebrates. Chaetae have many purposes. In some invertebrates they help support the body during digging (Echiuroidae, many annelid worms, Pogonophora) or crawling (annelid worms). In other invertebrates it serves a protective function (certain polychaetes and brachiopods), and in still others it is used in capturing prey (chaetognaths). In polychaetes, the chaetae are part of the primitive extremities—parapodia. Each chaeta consists of a single cell on the floor of a cutaneous invagination. The chaetae of arthropods are hairlike or feathery protuberances of the chitinous cuticle; they are sense organs (mainly of touch) and sometimes help protect the body, especially the wings, from excessive wetness. Some ticks and mites still preserve primitive metamerism in the arrangement of their chaetae.

References in periodicals archive ?
The mvo consists of modified chaetae (the modifications are sometimes very considerable) and it is situated on different abdominal sterna: Abd.
The presence of modified chaetae in mature males is not a common phenomenon for the genus Protaphorura.
3A; lobes orientated posteriorly to show short notochaetae), neuropodial lobe small, inconspicuous, tuft of unilimbate neurochaetae; chaetigers 2-4, notochaetae arranged in three tiers, first row short, slightly bent and unilimbate, second row slightly longer than first row and spear-shaped, third row long and lanceolate; chaetigers 6-10 as on anterior chaetigers, but chaetae of first row more sharply bent; in subsequent chaetigers short chaetae fewer, with longer chaetae increasing in number; no modified posterior notochaetae.
5x length of preceding and succeeding chaetigers; five modified spines alternating with bilimbate companion chaetae (Fig.
Group of Number of Types of Names of chaetae chaetae chaetae chaetae Cl 4 M F me G Af 11 M B me A, D, E, C, O Oc 3 M Ocm me Ocp mi Oca Di 2 M Dil mi Di2 De 2 M De1 mi De2 D1 6 M D11, D15 me D12-4, D16 (L+S0) 10 M L1, L4 So1 me So4-6, L2-3 b) Chaetotaxy of antennae.
Almost the whole population sampled in April-September was immature, with traces of reproductive system (presence of spermathecal pores, lack of chaetae in XII, rudiments of testes and ovaries) in a few individuals only.
Doubt raised by Mari-Mutt in 1984 about the position of the Abd IV tricobothria remains, as in our specimen the chaetae are absent, so it is impossible to identify with certainty the position for the tricobothria, at the same level or one in front of the other, as is habitual in the other genera of the family.
Central prelabral chaetae slightly ciliated, external ones smooth.
IV with 2 distinct thickened S-chaetae, subapical organelle with globular apex; basolateral ms at about 14 length from base, above the proximal row of chaetae (Fig.
Coxae of legs I, II, and III with 3, 9, and 12 chaetae, respectively, trochanters with 9 chaetae each, and femora with 15 chaetae each.
The western species with hair chaetae (mostly accompanied by pectinates) in dorsal bundles
Sensory chaetae s not especially distinct, their formula per half tergum 2/022/222121.