Aphelenchus avenae
Bastian, 1865

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George Washington Memorial Parkway
Konza Prairie

Female, length 1/20", breadth 1/454".
External Characters. Body white, tapering very slightly at either extremity, both of which are rounded.  Head having no setae or papillae.  Caudal sucker none.  Integumental striae transverse, 1/10000" apart, easily visible.
Dart 1/1666" long, simple, not knobbed at the base.  Oesophagus 1/14th only of total length, having a globular and distinctly muscular terminal swelling, 1/1000" broad.  Intestine, portion next oesophagus very indistinct; granules scattered, rather coarse and colourless. Anus 1/666" from posterior extremity.  Vulva posterior to commencement of hinder third of body, 1/77" from posterior extremity. Excretory duct opening slightly posterior to commencement of intestine.
Male not seen.
Hab. Between the lower sheaths of leaves of oats from stubble-field, Broadmoor, Berks.
(Description- Bastian, 1865)

0.7-1.0 mm; a = 24; b = 5.1; c = 34; V = 76
Body almost straight when relaxed. Lateral fields marked by 10-12 incisures, decreasing in number toward the extremities. Lip region rounded, continuous with head contour. Cephalic framework well sclerotized, cheilorhabdions very refractive. Spear 25u-28u long, without basal knobs, its musculature of an unusual type. Cephalids outstanding with ducts leading to tissues lying beside corpus of esophagus and probably terminating in the nerve ring.  Esophageal lobe dorso-submedian, 2 to 3 times as long as body width. Ovary outstretched, variable in length, sometimes reaching almost to esophagus, with oocytes arranged in single file. Eggs 2-3 times as long as body width. Neither spermatheca nor spermagonium observed. Posterior uterine branch collapsed, 2-3 times as long as body width. Phasmids terminal, best seen from a dorsal or ventral view. Males not observed in Great Plains collections.

Habitat: Widely distributed throughout the region in both virgin and cultivated soils.
(Description- Thorne & Malek, 1968)

DNA Sequences Obtained
Specimen: Collected:
KonzaI BC-117 Konza Prairie, First survey