Chaeta


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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 ?
Parapodia long, cylindrical and truncate, each with one acicula, three bidentate falcigerous chaetae, and one pointed dorsal simple chaeta (serrated near tips on anterior chaetigers).
Maxillary palp simple with 1 basal chaeta and 2 sublobal hairs.
S-chaeta slightly distinguishable from ordinary chaeta, distributed as 11/011/222121 dorsally and 11/000/000100 ventrally (Figs.
Ant IV with bilobed apical vesicle with additional bifurcate chaeta beside it.
Simplified Mc formula (following Jordana & Baquero 2005): 7-1-0-3-2/0-2/2-5/0-2-2/0(2)-2(3)-[1.sub.0]4-2(3)-2 (maximum into brackets; 10, unpaired chaeta).
tergum I with 7-9+7-9 chaetae, chaeta m absent (i2-, Th.
tergum I with 8-9+8-9 chaetae, chaeta m absent on i1(2).
Furcal area with 2+2 chaeta in one row, 2 manubrial rows mm and mp, m-row with 3+3, p-row with 2+2 chaetae--external ones as macrochaetae), chaetae from the ma row displaced on the level of dental microchaetae (Fig.
Furcal area with 2+2 chaeta in one row, two manubrial rows mm and mp m-row with 3+3, prow with 2+2 chaetae--external ones as macrochaetae), chaetae from the ma row displaced on the level of dental microchaetae (Fig.