Tylenchus davainei
Bastian, 1865
Photo Gallery- Long's Peak

L = 0.9 mm; a = 30; b = 6.1; c = 6.2V = 63;
L = 0.8 mm; a = 35; b = 5.8; c = 6.1; T = 42

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
Specimen: Collected:
Haughton Crater 5Bin-15 Haughton Crater Survey
RMNP LP2-46 Long's Peak, Rocky Mountain Nat'l Park