pulvillus


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pulvillus

[‚pəl′vil·əs]
(invertebrate zoology)
A small cushion or cushionlike pad, often covered with short hairs, on an insect's foot between the claws of the last segment.
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Generally speaking, each of the first 4 tarsomeres may bear on its ventral surface a single, colorless pad-like enlargement called the tarsal pulvillus, and there is a soft adhesive lobe called the arolium at the apex of the fifth tarsomere.
Does having the tarsal pulvillus present only on the fourth tarsomere of all legs affect the ability of the animals to climb?
Leg: Brown, setation predominantly white; pro, mes, and met coxa apubescent, long white setose; met trochanter setose medially; femur brown, met femur more-or-less cylindrical only slightly wider than pro and mes femur, in distal half macrosetose, 1 anteroventral and 1 posteroventral row of macrosetae, posteroventrally long white, erect setose and setae arranged in distinct row; pro, mes, and met tibia straight, met tibia cylindrical, ventral keel absent, lateroposteriorly long white, erect setose and setae arranged in distinct row; pro and mes tarsomere 1 as long as tarsomere 2, met tarsomere 1 as long as combined length of tarsomeres 2-3; pulvillus well-developed, as long as well-developed claw, and as wide as base of claw; empodium absent.
Horatius Pulvillus appears in the Ad Marciam in a list of fathers who endured the loss of their sons with equanimity.
Length of first segment of the hind tarsus longer than the third, length of the third pulvillus under the first segment almost equal to summation of length of the first and second pulvillus; apices of 3 pulvilli obtuse.
hirsuta are indicative of free-living habits and the Velcro-like processes on the pulvillus are too diminutive to serve any host-gripping function and are probably more conducive to adhering to the rock walls.
Metafemur slender, not thickened; tibia with black or brown spines and with a dark brown or black spot at base of each spine; tarsus long; parempodia setiform, parallel; pulvillus small.
Claws black, shorter than tarsomere 5; empodium yellow (tip missing); pulvillus well-developed (almost as long as claw) (Fig.
Legs: slender, claws of moderate length, rather slender, apex distinctly curved, pulvillus of moderate size, covering a little more than half of ventral surface of claw, parempodia setiform (Figs.