Body arcuate with hooked tail when relaxed, tapering both ways from near middle. Striae variable, 2.5u near body to excessively fine at extremeties. Lateral field with 4 incisures, the border ones crenate. Deirids prominent, located near latitude of excretory pore. Phasmids not seen. Lip region truncate, striated. Spear 14u-16u long, strongly knobbed, its muscles attached to cuticularized walls of lip region since there is no definite cephalic framework. Median bulb 3/5 neck width with strong refractive valve. Anterior end of intestine frequently crowded by a large glandular body. Anterior ovary outstretched with oocytes in single file. Posterior uterine branch half as long as body diameter. Spicula and gubernaculum tylenchoid. Bursa about 3 times as long as body diameter.
Tylenchus davaini may be immediately recognized by its large size, arcuate body and hooked tails of both sexes.
Habitat: Small numbers about roots of native grasses and shrubs, Brookings and Cottonwood, South Dakota, Devils Lake, North Dakota, Glendive, Montana.
(Description- Thorne and Malek, 1968)
DNA Sequences Obtained
|Haughton Crater 5Bin-15||Haughton Crater Survey|
|RMNP LP2-46||Long's Peak, Rocky Mountain Nat'l Park|