title: Cuticle Ultrastructure of Hemicycliophora arenaria, Aphelenchus avenae, Hirschmanniella gracilis and Hirschmanniella belli.
abstract: Ultrathin sections of all parasitic stages of Hemicycliophora arenaria revealed two major divisions in the body covering. The outermost was a seven-layered sheath and the innermost a five-layered cuticle comprising three zones; an outer trilaminate cortex, a fibrillar matrix and a striated basal layer. The body covering of the nonparasitic males also exhibited two major divisions: the outer, a relatively thin four-layered sheath and the inner, a six-layered cuticle consisting of three zones; an outer trilaminate cortex, a two-layered matrix and a striated basal layer. The cuticles of all stages of Aphelenchus avenae were similar, consisting of five layers divisible into three zones; an outer trilaminate cortex, a fibrillar matrix and a striated basal layer. Hirschmanniella gracilis and H. belli cuticles were also similar in all stages examined, consisting of six layers divisible into three zones; an outer trilaminate cortex, a two-layered matrix and a striated basal layer.
authors.forename: P W
authors.initials: PW
authors.lastname: Johnson
authors.forename: S D
authors.initials: SD
authors.lastname: Van Gundy
authors.forename: W W
authors.initials: WW
authors.lastname: Thomson