pedipalp


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Related to pedipalp: book lung, Cheliped, Coxal gland, chelicerae

pedipalp

(pĕd′ə-pălp′)
n.
One of the second pair of appendages near the mouth of a chelicerate, such as a spider or horseshoe crab, used for various reproductive, predatory, or sensory functions.

pedipalp

either member of the second pair of head appendages of arachnids, specialized for different functions in different forms. For example, seizing prey in scorpions, locomotion in king crabs, fertilization in male spiders (where the tip becomes a specialized container for sperm transfer), squeezing and chewing food, or for sensory purposes.
References in periodicals archive ?
sisyphoides' evolution, the species probably couldn't afford to reduce pedipalp size too much, says Irschick.
Coefficients of variation for the four spermatophore traits exhibiting the greatest overall population differentiation ranged from only 3% to 8%, compared with values of 12% to 20% for the highly sexually dimorphic traits of the male pedipalp.
abnormipes, lacking obvious borders; pedipalp subcylindrical and well-sclerotized with tarsus usually nearly quadrate in outline with large, obvious clawlets; dorsum with obvious dorsal plates; male genital field as in Polyatax; male fourth walking leg modified with tibia bearing one or two large blunt spines; tarsal claws of walking legs bifid; first walking legs with large setae.
It differs from Phalangium in terms of shorter tarsus of pedipalps, shorter and thicker legs (Banks, 1893; Snegovaya 2012).
Pedipalp pale, with dark lines pro-and retrolaterally.
Caudal segments II to IV with ventral keels that are double in the extremes of the segments and single in the middle, (2) noticeable sexual dimorphism, especially in the pedipalp shape; the chelae in the males are markedly thin and long, (3) number of pectineous teeth (male: 18 in each pecten; female: 18 in the right pecten and 19 in the left one), (4) number of rows of denticles in the movable finger of the right chela (16 in both sexes).
Male and female genital fields similar to those of the subgenus Unionicola; pedipalps thick with tarsus short and not tapered at distal tip; distal end of pedipalp tarsus with two small clawlets and an enlarged clawlet; first walking legs with few setae that are small and not on tubercles; male and female walking legs are similar.
The shape of the pedipalp tibial apophysis is also distinct.
Female pedipalp pale yellow except dark brown spines and tarsal segment, tarsus single clawed.
S = smooth tumbler, B = tumbler with bails, PC = pedipalp claws, PA = pedipalp appendages, DL = distal leg segments, PL = proximal leg segments, M345 = third, fourth and fifth metasomal segments as one unit, M2 = second metasomal segment, M1 = first metasomal segment, Ch = chelicerae, Ca = carapace, and TMS = total mesosomal separation (= total exoskeletal disarticulation).
The movable finger of the pedipalp chela on the adult female is shorter than the carapace and slightly shorter than the fifth metasomal segment; in the holotype it is slightly shorter than the carapace, and longer than segment V of the metasoma.
Pedipalps brown, clothed in long dense brown hairs, mixed with white hairs on the tibia and base of cymbium.