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.

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.

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Median and terminal apophysis of male palpus strongly sclerotized and acute at apex (Figs.
It has a small pair of dorsal antennae and a pair of maxillary palpus in ventral position, each palpus shows two sensillae.
Palpus dark brown; third segment cylindrical with subapical sensory pit; fifth segment as long as third; palpal ratio 3.
Cardo reduced; stipes prominent; galea finger-like and elongate, approximately half the length of palpomere (MP) 1; palpus length, excluding palpifer.
These ratios are as follows: A/CP: the sum of the lengths of palpus, leg I, and leg IV divided by the sum of length of chelicera and propeltidium indicating length of appendages in relation to body size.
Head and mesosoma mainly black except for the following yellow parts: maxillary palpus, hypostomal area, labrum, and mandible, except for red brown apex; clypeus, supraclypeal and lower paraocular areas as in Fig.
The genus Acerentuloides is characterized by 2 pairs of A-setae on the mesonotum and metanotum; 3 setae on the 2nd and 3rd pair of abdominal legs, of which the apical median seta is minute; well developed labial palpus with terminal tuft of setae and broadened sensillum; maxillary gland with small, smooth, globular vesicle or granulated appendix on the calyx and with several small globules in distal part; some setae modified as short, thickened sensilla (sd5 on head; [beta]1 and [delta]4 on foretarsus; setae P4 on metanotum, M2 on prosternum, and A2 on thoracic sterna; and accessory setae on tergites and sternites I--VI); 6 setae on sternite VIII; anterior position of seta P3 on abdominal tergites II--VI; developed striate band with clearly visible parallel-sided striae.