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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Shape: Head round, antennae slender without scales, gradually clavate but without a distinct club-shaped, eyes large, maxillary palpi well developed, slightly compressed, proboscis long and highly coiled; thorax, fore wings simple, terminal margins never dentate or caudate, hind wings with terminal margin never dentate, cell closed, with patches of modified scales around the cell; legs with tibia as long as the femur with long hairs, in females wide and club-shaped, with four segments, all firmly joined together; abdomen slender.
Short conical palpi, II palpal segment projects laterally extending beyond the basis capituli, about twice as broad as long, eyes absent .
All the Colombian specimens studied have three labial palpi segments.
Palpi, sensitive appendages attached to the oral part of a cockroach enabling it to pre-taste food
They also extend palpi for firm anchorage, the family physician explained.
The former species is characterized by hooked bristles on the labial palpi of the female lacking in the latter and by a mostly black female clypeus (lower part of the face) that is completely yellow colored in the other species.
Australentulus also has a well-developed striate band, but differs in possessing reduced labial palpi and 4 setae on sternite VIII.
They search oviposition sites by their maxillary palpi, antennae and ovipositor valves.
Los caracteres diagnosticos para la identificacion de las ninfas del genero son: 1) Cuerpo elongado; 2) Femures anteriores con largas setas y con cortas espinas en el margen anterior; 3) Pterotecas posteriores presentes; 4) Branquia subtriangular con 2 cristas elevadas; 5) Formula branquial 4/5/4-5/4/2, lobulos subtriangulares, 6) Femur anterior con una hilera transversal de largas setas: 7) Femur II y III con una hilera transversal de setas dorsales hasta la base; 8) Palpi maxilar pequeno, bisegmentado con seta apical; (DOMINGUEZ et al.