Define Features of male and female ascaris lumbricoides?
i) Ascaris lumbricoides is commonly called round worm.
ii) Body is elongated, cylindrical, tapering at both ends.
iii) Body surface is marked with four longitudinal lilies, one mid-dorsa!, one midventral and two lateral lines.
iv) Mouth is provided with three lips (i) a median dorsal lip and (ii) a pair of symmetrical sub medial ventral lips.
v) Sexes are separate and sexual dimorphism is well marked.
vi) Male is smaller than female and measures 15 to 31cm in length with posterior end curved ventrally.
vii) Female is large, measuring a length of 20 to 35 cm with posterior end straight arid blunt.
viii) Male has single testis and seminal vesicle. Seminal vesicle leads to the exterior via an ejaculdtory duct located alongside the anus. It is also provided at the posterior end with a pair of curved spicules know as penial setae which are the copulatory organs. Males also possess pre- and post-anal papillae, which are lacking in female.
ix) The female has 2 ovaries, 2 oviducts and 2 uteri joining at a single vagina and opening through a gonopore also called genital aperture which lies at a distance of about one-third of the length of the body from the anterior end.
x) Excretory pore is small and lies on the ventral side about 2 mm away from [lie anterior end.
xi) Life cycle is simple and monogenetic. No secondary host is involved.