Tylenchus (Aglenchus) thornei Andrássy 1954
Tylenchus angusticephalus Thorne & Malek, 1968
F. japonicus Mizukubo & Minagawa, 1986
Malenchus japonicus (Mizukubo & Minagawa, 1986) Sultan, Singh & Sakhuja, 1991
Syn: Tylenchus angusticephalus
L = 0.7 mm; a = 40; b = 7.2; c = 3.6; V = 59
twice as long as vulva-anus distance. Neck
slightly to an abruptly narrowed lip
region. Cuticle and subcuticle both striated, the striae being aout
1u apart. Lateral
field 1/5 body width with minutely crenate borders and two fine incisures.
Cephalic framework moderately sclerotized. Cephalids conspicuous from a
lateral view. Spear10u
long with well developed knobs, its muscles attached to a broad, heavily
cuticularized band of subcuticle. Dorsal esophageal gland outlet adjacent
to spear base. Median
bulb slightly elongate with strong oval valve. Nerve ring encircling
isthmus near middle. Basal
bulb elongate pyriform.Excretory
pore, hemizonid, and deirid about opposite anteroir end of bulb.
Cardia irregularly discoid. Spermatheca as long as body width, filled with
sperms. Posterior ovary half as long as body width. A portion
of the excessively filamentous tail
frequently may be broken off. Males not collected, but sperms in spermatheca
indicate that they are present.
Tylenchus angusticephalus is immediately recognized by the abruptly
narrowed lip region, attachment of spear muscles, pyriform basal bulb and
exceedingly filamentous tail which is about twice as long as vulva-anus
Habitat: Field soil near Avon, South Dakota, collected by F.
E. Caveness, 1958, and pasture soil, Minden, Nebraska.
Andrassy, 1963, described Aglenchus machadoi for which he illustrated
lateral vulvar membranes. This species obviously is related to Tylenchus
platycephalus and T. angusticephalus but lateral membranes are
not present on these species.
DNA Sequences Obtained