Spines

Projections on the cuticle with various Forms , Sizes , Rows(one,two or numerous) , Numbers, Locations

Restricted only to Cephalic region: e.g. Carnoya fimbriata

Tip of the Femail Tail:  Ancylostoma duodenale

Arranged in numerous rows: e.g. Podocnematractis colombiaensis

Existing in different regions of the body:  e.g. Buckleyatractis marinkelli

The points of spines may be Simple ,large and hook-like or divided into more than one pointat the distal tip (e.g. Podocnematractiscolombiaensis)