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How do penial setae help in copulation in roundworms??

How do penial setae help in copulation in roundworms??

Grade:12th pass

2 Answers

25763 Points
one year ago
The cloacal opening is associated with a pair of curved chitinoid spicules called penial setae, each of which is provided with a muscular penial sac. The spicules are cuticular structures which serve to open the female genital pore during copulation and help in the transference of sperms.
Vikas TU
14149 Points
one year ago
Dear student 
The male repro­ductive organs are unpaired, monodelphic and lie in the posterior half of the body. The testis is a long and single thread like structure occupying the anterior part of pseudocoel. Presence of a single testis produces a condition known as Monorchic
Male is smaller
The posterior aperture is cloacal aperture into which digestive and genital tubes open. A pair of curved chitinoid rods or copulatory spicules or pineal spicules protrude beyond the cloacal aperture.
The tail-end is curved ventrally in the form of a hook with a conical tip.
No vulval aperture in the mid-ventral line, one third from the anterior end.

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