Filenchus ditissimus
(Breski,1963) Siddiqi, 1986
-according to Raski & Gereart, 1986
Syn: Tylenchus parvissimus
Photo Gallery- Konza Prairie
Photo Gallery- Nine-mile Prairie

0.33 mm; a = 26; b = 4.5; c = 4.5-5.6; V = 65
0.33 mm; a = 36; b = 4.0; c = 5.5; T = 41
  Body somewhat fusiform, tapering from near middle to extremities. Striae excessively fine.  Lateral field a bright band with occasional traces of two minute incisures. Lip region rounded, not set off in any manner.Spear about 9u long, strongly knobbed, its muscles attached to basal plate of cephalic framework. Median bulbs strongly developed. Basal bulb pyriform, the large dorsal gland nucleus located well back in the bulb. Cardia discoid. Intestine with fine granules. Vulva a deep slit, vagina extending in and forward less than halfway across body. Ovary with only 8-10 oocytes arranged in single file except for a short section adjacent to cap cell.  Vulva-anus distanceslightly less than tail length. Tail conoid to a minute rounded terminus.
Male more cylindroid than female, body bent at anal area. Bursa narrow, about 15u long. Spicula arcuate, 11u long. Gubernaculum slightly arcuate, trough-shaped. Tail uniformly conoid to minutely rounded terminus.

Tylenchus parvissimus is distinctive among the tiny species by its well developed spear, strong median bulb, pyriform basal bulb and uniformly tapering tails, that of the female being slightly longer than the vulva-anus distance.

Habitat:  Pasture, Minden, Nebraska, and native sod east of Baker, Montana

DNA Sequences Obtained
Specimen: Collected:
KonzaIV DD-145 Konza Prairie, First survey