Filenchus neonanus
Raski and Geraert, 1986
Photo Gallery- Konza Prairie

Holotype female:  L = 0.483 mm; a = 39; b = 5.4; c = 4.8; V = 63

Female: body nearly straight curving only slightly ventrally after killing, fixing and mounting.  Body shape almost cylindrical from vulva to oesophagus then narrows gradually to rounded anterior end.  Cephalic region continuous with body contour, not set off, bears four to five annuli up to labial plate; low, rounded.  Labial plate squarish with rounded corners dominated by large, oval, concave oral disc which is set off by deep incisure.
     Six labial innervations seen present on oral disc but indistinctly.  Amphid aperatures large tear-drop shaped oriented dorso-ventrally occupying most of space between oral disc and edge of labial plate; borders of amphids simple rounded, not protruding.  Next succeeding four to five annuli hexaradiate in shape.  Cephalic sclerotization delicate; stylet delicate, cone about 1/3 total length, knobs well-developed, backwardly directed.  Isthmus very slender, posterior bulbar region pyriform; oesophageal/intestinal valve rounded.  Excretory pore immediately posterior to hemizonid, canal heavily sclerotized, prominent.
     Gonad single, outstretched, quite prominent.  Spermatheca not distinct, cells forming wall swollen, not distinct lumen, small, probably in-line, lacking sperm.  Uterus short, quadricolumellar.  Posterior sac present but usually collapsed.  Vagina short, thin-walled, perpendicular to ventral body line.  Vulva simple slip-like, lips rounded.  Body narrows gradually from vulva to terminus; last 15-20 um of tail slightly sinuous, often curls near tip.

Type habitat and locality:  moist soil on creek bank about roots of mosses and forest trees on Ben Taylor trail #606, west of Shawnee, Colorado, U.S.A. at about 2800 m elevation.

-Raski and Geraert, 1986