trichobothrium

trichobothrium

[¦trik·ə′bäth·rē·əm]
(invertebrate zoology)
An erect, bristlelike sensory hair found on certain arthropods, insects, and other invertebrates.
References in periodicals archive ?
Trichobothrial pattern neobothriotaxic major Type C, with one accessory trichobothrium in V series of chela; femur with 3 trichobothria (d, i, e), one macroseta (M1) associated with d and i, e situated slightly proximal to Ml; patella, with 19 trichobothria (2 d, i, 3 et, est, 2 em, 2 esb, 5 eb, 3 V); chela with 27 trichobothria (Dt, Db, 5 Et, Est, Esb, 3 Eb, dt, dst, dsb, db, et, est, esb, eb, ib, it, 5 V), [V.sub.2] displaced externally with respect to the line of V trichobothria; Esb forming a triangle with [Eb.sub.2] and [Eb.sub.3].
4) with proximal half strongly sclerotized, sensory fields circular, with ten trichobothria on basal rosettes, and a marginal trichobothrium without basal rosette, distal half also sclerotized, bearing a long mesal prong.
Spiracle and trichobothrium on the 6th abdominal segment.
7) almost elliptic, setose; sensory fields with eight trichobothria on basal rosettes and one marginal trichobothrium, without basal rosette.
Trichobothrium (0) Absent; Mesovelia furcata and most of the sensillum nepomorphans (1) Present; Curicta granulosa, Borborophyes mayri, Laccotrephes japonensis, and Nepa cinerea K12.
Paraprocts of two pieces, the proximal one joining the clunium, sensory fields with 14 trichobothria on basal rosettes, and one marginal trichobothrium without basal rosette; distal piece with a small sclerotized prong, distally truncate (Figs.
The protonymphs of both species have short, narrow chelae with three trichobothria on the fixed finger (et, ist, and eb) and one trichobothrium (t) on the movable finger (Figures 3(e) and 10(a)).
The following abbreviations are used: asl, attenuate solenidion; bsl, blunt ended solenidion; sts, simple tactile setae; T, trichobothrium.
The slender trichobothrium (Tr) arises vertically from a prominent socket; the stronger tactile hair (T) emerges obliquely from a less-developed socket.
The only other character used to distinguish between these two subfamilies is a difference in the position of the trichobothrium ist, on the prolateral surface of the fixed finger of the pedipalp chelae.
In our specimen has been imposible to determine the position of the second trichobothrium because the absence of the chaetae and the similarity of the sockets.
(2) The second group includes mechanosensitive sensilla of different shapes (squamiform, trichobothrium, paddle-like, clubbed-like, ribbon-like, chaetic with bisected tip, fingerlike, freniale-like, peg, cupola, basiconica, star-like, multi-lobated); they are usually characteristic of individual taxa (species, subfamilies, or families).