Body annuli retrorse, smooth with occasional anastomoses. Lip region with three annuli, first annulus thinner and more rounded than succeeding annuli; four submedian lobes present, rounded, prominent and close to each other ventrally and dorsally; labial disc at about same level as submedian lobes, with slit-like oral opening and amphidial aperture appearing as two oval slits on outer margins; labial plates not projecting behind labial disc, variable in appearance. Stylet relatively short, robust; knobs 7-10 um wide, variable in shape, generally rounded with anteriorly directed processes. Excretory pore 1-7 annuli posterior to base of pharynx. Spermatheca usually filled with sperm. Vulva open; lips conspicuous, rounded, differentiated from adjacent annuli; in ventral view anterior lip rounded at surface with central bulge to the inside, sometimes described as anterior lip with two small teeth. Tail bluntly rounded, terminus convoluted, forming two to four lobes.
Male not found.
Juvenile not found.
Mesocriconema onoense is very close to M. palustre. In M. palustre the two dorsal and the two ventral submedian lobes are connected and in M. onoense they are separate.
Described from Ivory Coast, redescribed from Ivory Coast and Guinea (Luc, 1970), Venezuela (Loof, 1964; Raski & Golden, 1965), Peru (Raski & Golden, 1965), Pakistan (Maqbool, 1982), Brazil (Rashid et al., 1987), India (Muthukrishnan, 1987; Rahman, 1990); Papua New Guinea (Decraemer & Geraert, 1991) and China (Ye et al., 1997).
(Description- Geraert, 2010)