General features of roundworms are
(i) The body is cylindrical and tapering at both ends.
(ii) No segmentation.
(iii) Bilateral symmetry.
(iv) They have organ system level of organisation.
(v) The anterior end does not form a distinct head.
(vi) There are no locomotory appendages in roundworms.
(vii) The body wall consists of firm, non-living, resistant
cuticle, epidermis and muscle layer.
(viii) These are pseudocoelomates.
(ix) Hydroskeleton is present.
(x) Digestive tract is complete. Respiration occurs bv
body surface.
(xi) Circulatory system is undeveloped. Excretion
through gland cells.
(xii) Sexes are separate. Sexual dimorphism is present’
Fertilisation is internal. There is no asexual
reproduction.
(xiii) Development is direct.