Ditylenchus microdens
Thorne & Malek, 1968
Photo Gallery- Konza Prairie
Photo Gallery- Nine-mile Prairie

L = 0.7 mm; a = 33; b = 4.3; c = 15;V = 82
L = 0.6 mm; a = 38; b = 5.3; c = 14; T = 65
Cuticle with annules about 1.3u wide at midbody. Lateral fields obscure, about 1/4 body width, marked by 4 fine lines. Lip region low, flat. Spear only 8u long with moderate sized knobs, its muscles attached to basal plate of cephalic armature.  Median bulb elongate fusiform with strong refractive valve near center.  Isthmus about 3 times neck width with nerve ring slightly anterior to middle. Basal bulb elongate pyriform with 3 large nuclei.  Excretory pore and hemizonid well anterior to bulb.  Anterior intestinal cells hyaline, attached to bulb by obscure valvular apparatus.  Intestinal lumen narrow, tenuous.  Vagina extending 1/3 across body.  Ovary outstretched, oocytes in single file.  Poterior uterine branch as long as body width. Tail 3/4 as long as vulva-anus distance. Tails of both sexes arcuate to pointed terminus. Male more slender than female with wide bursa extending to near middle of tail, where it is attached to a ventral elevation.

Ditylenchus microdens is distinctive because of the small spear, tail shorter than vulva-anus distance, broad bursa extending to near middle of tail and pointed terminus in both sexes.

Habitat: Cultivated fields near Avon, Gary, Huron, Presho and Brookings, South Dakota.  Also from fields near Holbrook and Fairmont, Nebraska.

DNA Sequences Obtained
Specimen: Collected:
KonzaIV DD-71 Konza Prairie, First survey
KonzaIV DD-61 Konza Prairie, First survey