Thorne, 1974
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Description (from Thorne, 1974)
Body cylindroid, slightly arcuate. Lip region 1/3 width of neck
base. Lateral fields 1/4 body width containing large cells obscured
by dense granules. Lip
region set off by deep constriction with rounded lips. Spear
about
as wide as adjacent cuticle, 18 um long, the aperture 2/5 its length.
Guiding ring double but usually collapsed until appearing single, refractive,
about 1/3 head width. Esophagus
at
first 1/3 then 1/6 as wide as neck, expanding gradually until 1/2 body
width. Cardia
discoid,
then conoid, about 1/2 as long as body width. Intestine packed with
dense yellowish granules. Prerectum length 3 times body width.
Vulva longitudinal. Ovaries reflexed 1/2 way back to vulva.
Uterus serving as a spermatheca and an additional spherical spermatheca
at entrance to each oviduct.
Male more arcuate posteriorly with 21-28 supplements
extending as far forward as the prerectum. Supplements sometimes
closely approximated, or slightly spaced as illustrated. Spicula
with strong ventral angle, lateral guiding pieces simple.
Labronema rapax is immediately distinguished
by the low, rounded, set off lip region, short, massive spear, spheroid
spermatheca, supplement numbers and arrangement and bluntly subdigitate
tails.
Habitat: Small numbers from cultivated and
virgin soil Milbank, Waubay Preserve and Black Hills, South Dakota; Tagus
and Rugby, North Dakota; Downer, Minnesota; Baker, Montana; Hadashville,
Manitoba, and Moosomin, Saskatchewan, Canada.
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