ventral tube

ventral tube

an appendage of the first abdominal segment of COLLEMBOLANS formed by the fusion of paired limbs. It may be associated with attachment or water uptake and the name Collembola (glue bar) is based on this structure.
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Histological sections showed that these tissue layers occupied about 24% and 59%, respectively, of the wall of the ventral tube foot of A.
The group name Collembola was chosen to indicate the presence of this ventral tube. This name is derived from two Greek words: kolla, meaning glue, and embolos, meaning a peg or wedge, because the tube emits a viscous fluid that glues the animal to a smooth surface.
Ventral tube with 4 + 4 setae, 2 anterior distal setae subequal in size, 2 posterior setae different, 1 larger.
Ventral tube with 5-6+5-6 distal chaetae and 2+2(1) basal chaetae, without anterior chaetae.
Ventral tube with 5-6+5-6 distal chaetae, without anterior or basal chaetae (Fig.
I (on ventral tube), II, II-III, II-IV and VI (anal valves) depending on the species.
Ventral tube with 6+6 chaetae and without basal chaetae.
Ventral tube with 4+4 distal, 4+4 anterior and 4+4 posterior setae.
Ventral tube with 6+6 lateral paired setae (4+4 in distal and 2+2 in basal position) and 1 unpaired posterior seta (Fig.
General morphology: Abd., abdominal segment; Ant., antennal segment; Cx., coxa; Fe., femur; Scx2, subcoxa 2; Ti, tibiotarsus; Th., thoracic segment; Tr., trochanter; VT, ventral tube.