Filenchus ditissimus
(Breski,1963) Siddiqi, 1986
-according to Raski & Gereart, 1986
Syn: Tylenchus parvissimus
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
