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McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



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.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
To test whether mesh size affects the detection of earthworm chaetae in faecal analysis, we ran a Generalised Linear Mixed Model (GLMM), with the presence/absence of chaetae in each fraction as dependent variable, and mesh size as fixed effect (categorical with three levels: 0.21, 0.54 and 1.00 mm).
First chaetiger with annulated cirrus, equal in length or longer than antennae, and 2-3 simple chaetae. Segments 2-9 with biramous parapodia, with 5-12 simple chaetae per rami, and filiform and smooth interramal cirri.
Spermathecal chaetae trivial (nib-shaped, distal portion with parallel edges, not twisted).
Comparison: New material mostly corresponding with original description and paratype examined (Day 1957); in the paratype the last 12 chaetigers are abranchiate, falling within the range observed in the new material, posterior inferior companion chaetae are not mentioned in the description but are present in both the new material and the paratype, although they are present on fewer chaetigers in the latter.
On the other hand, the higher frequency of stiff hairs in faeces may be an overestimate, chaetae could have been intercepted into an epithelium of a digestive system and might therefore be repeatedly released into faecal samples during digestion, or they could come from the digestive system of other hoopoe prey such as predatory beetles (Z.
IV with globular apex; basolateral ms above the 2nd proximal row of chaetae (Fig.
Juveniles removed from tubes 1-2 days after metamorphosis were about 350 [micro]m in length, with six chaetigers (the anterior three bearing capillary chaetae and the posterior three hooded hooks: Fig.
First three parapodia reduced, with two or three spinigerous chaetae and no cirri (Fig.
It is considerably larger there: 12-18 mm long, consisting of (35)50-58 segments, and with (1-3)4-8 chaetae, measuring 70-110 [micro]m, per bundle (Timm 1999).
Burrowing by polydorids was initially believed to be carried out mechanically by the chaetae, in particular the modified chaetae of the filth chaetiger (Blake & Evans 1973).