Palpus


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palpus

[′pal·pəs]
(invertebrate zoology)
A process on a mouthpart of an arthropod that has a tactile or gustatory function.
Any similar process on other invertebrates.
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 It might be outdated or ideologically biased.

Palpus

 

a segmented appendage of the jaws (mandibles and first and second maxillae) in crustaceans, myriapods, and insects, equipped with various sense organs (tactile organs and chemore-ceptors). The palpi are well developed and completely represented in crustaceans; in myriapods and insects there are no palpi on the mandibles. In many insects, especially those with a sucking-type mouth apparatus, the palpi are reduced.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
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Mouthparts well developed, maxillary palpus and labial palpus covered with light brown scales.
Colour: Head orange, except for black palpus and swollen part of frontal vitta; notum and upper pleuron brick-red; foreleg black, except tarsus; tarsomeres 1-3 white, distal tarsomeres dark; mid femur black with orange apex, mid femur orange at base and apex; abdomen black, except for extreme base and white fasciae across pleuron on segments 2 and 3 (Fig.
Median and terminal apophysis of male palpus strongly sclerotized and acute at apex (Figs.
Ontogeny and homology in the male palpus of orb weaving spiders and their potential outgroups, with comments on phylogeny (Araneoclada, Araneoidea, Deinopoidea).
Left palpus in prolateral view (A, G), left palpus in ventral view (B, H), left palpus in retrolateral view (C, I), habitus dorsal (D, J), habitus ventral (E, K) and habitus lateral (F, L).
Mouthparts: labellum triangular in frontal view, with microsetae; palpus 3-segmented (Fig.
Labrum long-attenuate with two pairs of ventral setae; labella hemispherical, each with some lateral setae and two pairs of short setae; palpus with four segments: 1st segment shortest, globose as long as wide, 2nd-4th segments cylindrical, 2nd segment widest, 1.5 as long as wide; 3rd segment 3 times as long as wide, 4th segment longest, 3.5 times as long as wide, all with widely scattered setae and scales.
The members of the tribe Bulaeini were also differentiated from the other tribes of the subfamily Coccinellinae by having clypeus with broad anterolateral emerginations; gena never extending on to eye; mandible large with bifid apex; maxillary palpus with terminal segment with dosrsal margin strongly produced anteriorly weakly securiform; pronotum convex anteriorly never excavated anterolaterally.
Palpus with slight apical dilation, no more than twice the palpal base width (Fig.