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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Front femur Type [B.sub.2] or [B.sub.3]; pulvilli present only on fourth tarsomere of all legs, tarsal claws simple, symmetrical, arolia present.
Pulvilli are present .................................................Culex- Pulvilli are not present or simple...................................
Length of the first segment of a hind tarsus longer than the third, pulvilli shallow, individually increasing in length distad, all apices of pulvilli sharp.
Legs: Long and slender, femora slightly curved with distinct trochanters; tibiae straight, protibial comb present; tarsi two-segmented, claws with setiform pulvilli.
Tarsi two-segmented; protarsi and mesotarsi with divisions between tarsomeres obscure; metatarsomeres equal in length, metatarsomere I bearing apical row of four black-tipped spines, with external longest; tarsomeres II of all legs subconical, slightly curved, with pair of black claws and pulvilli apically (Fig.
Claws, pulvilli and empodia well-developed (metathoracic empodia border on being inflated and laterally compressed as seen in Empodiodes Oldroyd, 1972).
Entirely black; ventral surface of fore with few tenant hairs, fore tibia with 2-3 medial ad, slightly longer than body hairs, 1-2 medial pv; mid femur av rows short and thin, hairs-like, with a complete pv row, mid tibia with 1 submedial ad, strong, 2 medial v, 1 submedial p; hind femur with a complete but sparse av row, and a row of strong pv in basal half, ventral surface of basal part with setae, fringe-like, hind tibia with 1 av, 2-3 ad, 2-3 pd; tarsi slightly shorter than tibiae, claw and pulvilli developed, subequal to the length of 5th tarsomere.
The pretarsus is also distinctive, with the distally angulate claws (11-1), greatly expanded lamellate parempodia (12-1), and greatly enlarged pulvilli (13-1).
3-4): claws falciform, untoothed; empodia less than 1/2 length of claws; pulvilli about 1/4 length of claws.
Legs: Dark red-brown to black except for distal tips of femora and proximal ends of tibiae which are narrowly orange-brown, macrosetae brown-red, fine setae whitish; coxae extensively silver pruinose, white setose; claws, pulvilli and empodia moderately well developed.
DISCUSSION: This genus was synonymized with Campylomma by Carvalho (1952), but Schuh (1984) reinstated it as a separate genus distinguished on the basis of enlarged pulvilli that cover nearly the entire ventral surface of the claws, and the distinctive structure of the vesica.