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Female: Body short, stout, 0.36 to 0.56 mm
long.
70 to 80 annules, strongly retrorse.
Head offset, with one small, reduced, basal annule, bearing a very
large, rounded lip region with 6 pseudolips, the lateral pseudolips
larger..
Lip region has six large lips, the two lateral lips with spacious
cavities in their sclerotization and extending beyond it.
Stylet 63 to 90  µm long, flexible.
Body marked by 8 to 28 rows of scales, with a thick basal portion
and thin, elongated, drawn-out posterior region to form a spine.
A very light, delicate "fringe" of cuticle may be
present.
Tail conoid, with the scales more enlarged.
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Male: Three lateral lines.
Spicules
48  µm long.
Caudal
alae small or lacking.
Tail conoid.
Juvenile: Known only for B. serratum.
Head and tail resemble adult female.
Cuticular ornamentation as ten rows of scales at midbody, decreasing
in number anteriorly and posteriorly. Each scale with flat
pentagonal-shaped anterior base, rounded U-shaped posterior part with
three to five fine serrations at tip.
[Raski and Luc, (1987), Geraert (2010)]
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