Thorne, 1974
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Description (from Thorne, 1974)
Bodies practically straight and cylindroid except
anteriorly. Lateral fields 1/3 body width. Lip
region 1/4 width of neck base, generally set off by a partial view
of amphid apertures due to the twisted anterior portion of the body, but
probably rounded if a true lateral view could be secured. Tooth very
acute, cylindroid-deltoid about 20 um long, the basal portion difficult
to determine. Esophagus
slender in anterior 1/3 then gradually expanding until posterior 1/2 fills
body cavity. Musculature so dense that esophageal gland nuclei not
observed. Cardia
obscured by large glands. Intestinal cells packed with dark brown
granules. Vulva
and vagina similar to those of A. aquaticus. Ovaries and uteri
unusually long. Uterine spermatheca 4-5 times as long as body width,
packed with sperms. Prerectum length 4-5 times body width.
Male with the usual thick, slightly arcuate spicula and small furcate lateral
guiding pieces. Four elongate, slightly elevated supplements.
Diagonal copulatory muscles a prominent feature. Aquatides rotundicaudatus
is immediately distinguished by the narrow lip region, short esophagus,
very elongated gonads and elongate hemispheroid tails.
Habitat: Small swamp area, Experiment Station
field, Brookings, South Dakota.
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