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 Female: Head somewhat flattened dorso-ventrally,
with four prominent lobes (2 subdorsal, 2 subventral) which have a
continuous outline in face view and are not separated from each other
by deep clefts.
Stylet flexible, bends with body.
Esophageal lumen folded in procorpus
when stylet retracted.
Median bulb
well-developed.
Excretory pore at level of posterior region of isthmus.
Basal esophageal bulb elongate-pyriform with 3 nuclei,
one larger dorsal nucleus situated about half-way along bulb, and 2
smaller subventral nuclei at the same level or posterior to
it. Not overlapping intestine. 
Vulva a transverse slit with a pair of opposing
sclerotized pieces in lateral view. 
Ovaries paired, outstretched, spermathecae
present.
Intestine extending beyond rectum to form a sac.
Anterior part of tail rounded or
conoid
merging into
the conoid spike of the posterior part.
Male: Similar to female, except for
sexual dimorphism.
Spicules
slightly arcuate, distal end of gubernaculum
protruding from body.
Males have unique caudal alae,
well-developed.
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