Macroposthonia xenoplax
(Raski, 1952) De Grisse & Loof, 1965
syn.
 Criconemoides xenoplax Raski, 1952
Criconemella xenoplax (Raski) Luc & Raski, 1981
Mesocriconema xenoplax (Raski) Loof & De Grisse, 1989
Photo Gallery- Plattsmouth, NE
Photo Gallery- Konza Prairie
Photo Gallery- UC Davis
Photo Gallery- Kalsow Prairie, Iowa
0.58 mm; a = 22; b = 4.8; c = ?; V = 95
Body cylindroid except extremities.  Annules without anastomosis except in rare instances.  Sublateral labial lobes conspicuous.  Perioral disc rounded.  First cephalic annule indented, not circular, somewhat cupped; second slightly wider, definantly set off by constriction.  Remaining body annules rounded, slightly retrorse, numbering about 112.  Spear massive, 55u long, its muscles somewhat sclerotized in in basal third.  Median bulb massive, tapering to a broad isthmus.  A minute cardia present.  Excretory pore and hemizonid not observed.  Vulva usually on 6th or 7th annule from terminus.  Ovary outstretched, oocytes in single file except for a short region of multiplication.  Anus not definantly seen.
Habitat:  Numerous females and young from Medicine Butte, S. Dakota and one female from Fairmont, Nebraska.

This species included in the Criconematid Project

DNA Sequences Obtained
Specimen: Collected:
Fresno 6 from UC Davis
UCD-22 from UC Davis