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One of a pair of elongated, often segmented appendages usually found near the mouth in invertebrate organisms such as mollusks, crustaceans, and insects, the functions of which include sensation, locomotion, and feeding. Also called palpus.

[French palpe, from New Latin palpus, from Latin, a touching; see pāl- in Indo-European roots.]

pal′pal (păl′pəl) adj.


(pælp) or


n, pl palps or palpi (ˈpælpaɪ)
1. (Zoology) either of a pair of sensory appendages that arise from the mouthparts of crustaceans and insects
2. (Zoology) either of a pair of tactile organs arising from the head or anterior end of certain annelids and molluscs
[C19: from French, from Latin palpus a touching]
ˈpalpal adj


(ˈpæl pəs)

n., pl. -pi (-pī).
an appendage attached to an oral part and serving as an organ of sense in insects, crustaceans, etc.
[1805–15; < New Latin; Latin palpus or palpum palm of the hand]
palp′al, adj.


A segmented organ extending from the mouthparts of arthropods, used for touch or taste.
References in periodicals archive ?
It is widely accepted that the male palp fits specifically into the female epigynum of conspecifics.
The researchers found that removing one palp reduced the spider's body weight by y per cent, and removing both reduced it to nine per cent.
aegypti (12,16,18,20), on the sensory structures present in the antenna, maxillary palp, labial palp, tarsi and ovipositor; whereas information on the studies of sensillary systems in the Asian tiger mosquito, Ae.
The next stage was to contact the local spider recorder; we met at the canal to observe the spider and remove a palp for verification by Peter Merrett (one of the UK's leading arachnologists).
1F) Palp with 2, 1, 1, 2 setae; coxal endite with 6 distal setae; basal endite with 8 distal setae; broad scaphognathite with narrow posterior lobes having long naked setae.
In another trial, a shrew attacked the spider by first seizing the left palp in its jaws and twisting vigorously until the palp became detached.
Janzen had discovered that placing the palp on the dry, depleted land bought for forest restoration efficiently killed stubborn pasture grasses and nourished the soil.
The following data sets were run: (1) all characters included, equal weight; (2) palp and epiginal characters weighted as "2"; somatic and secondary sexual characters weighted as "1"; (3) characters reweighted by the CI (consistency index), RC (rescaled consistency index) and RI (retention index).
Comments: Specimens from Angola are smaller in body size than those from DR Congo, but their palp sizes are the same.