Filenchus thornei
(Andrássy, 1954)Andrássy, 1963


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

Photo Galleries-

George Washington Memorial Parkway
Konza Prairie

Photo Gallery- Nine-mile Prairie

L = 0.7 mm; a = 40; b = 7.2; c = 3.6;  V = 59
Body slender-fusiform. Tail almost twice as long as vulva-anus distance. Neck tapering 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 distance.

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
Specimen: Collected:
KonzaIV AB-140 Konza Prairie, First survey
KonzaIV AC-100 Konza Prairie, First survey