Cephalobidae, Acrobelinae. Body length between 0.3 and 1.1 mm.
Cuticle single, often ornamented with minute dots, annules simple or, rarely,
divided into blocks by longitudinal striae. Lateral field simple,
with two or three incisures, of which the marginal ones straight or slightly
crenate. Head with two kinds of appendages: labial probolae long,
bifurcate, fringed with thin and acute tines and terminated in fine spurs.
Cephalic prolobae more or less triangular, also with fringes. Amphids
circular, well visible. Stoma consisting of the usual five elements
(rhabdions); cheilorhabdions refractive. Oesophageal procorpus generally
cylindrical, terminal bulb strong. Location of excretory pore varying
between 1/4 and more than 3/4 of oesophagus length. Ovary anterior
with two flexures: postvulval uterine sac present. Males generally
with eight pairs of genital papillae. Tail in both sexes conoid,
acute, with distinct phasmids.
Type Species: Acrobeles
ciliatus Linstow, 1877.
Soil-inhabiting species occurring in every continent except the Antarctica.
DNA Sequences Obtained