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Author Topic: How do earth worms reproduce?  (Read 15991 times)

Offline realmswalker

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How do earth worms reproduce?
« on: 06/03/2005 22:47:24 »
Ive always wondered this, but im rather hesitant to type "Worm sex" into google so i came here.
Anyone know?


 

Offline neilep

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Re: How do earth worms reproduce?
« Reply #1 on: 06/03/2005 22:57:08 »
try this....it's biased towards kids but at least it's a start  http://www.urbanext.uiuc.edu/worms/anatomy/anatomy11.html

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Offline chimera

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Re: How do earth worms reproduce?
« Reply #2 on: 07/03/2005 02:55:29 »
quote:
Originally posted by realmswalker

 but im rather hesitant to type "Worm sex" into google



You might want to check that in a few days... it's there NOW... :D
 

Offline Ylide

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Re: How do earth worms reproduce?
« Reply #3 on: 08/03/2005 08:39:10 »
Without going into incredicle biological detail (which I will if you request as I've just 2 days ago finished an exhaustive study of annelids) the website Neil posted is pretty much spot on.


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Offline chris

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Re: How do earth worms reproduce?
« Reply #4 on: 08/03/2005 08:43:53 »
Can you go into incredible detail please ?!

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Offline Ylide

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Re: How do earth worms reproduce?
« Reply #5 on: 12/03/2005 22:38:17 »
Ask and ye shall receive:

The standard earthworm used in biological laboratories is Lumbricus terrestris.  It is in the phylum Annelida, class Clitellata, subclass Oligochaeta.  The reproductive method of the earthworm is the same for most of the members of the subclass.  

Oligochaetes are monoecious (i.e. hermaphroditic) and thus contain both testes and ovaries, located in the anteriot septum of certain anterior segments.  The sperm ducts and oviducts contain ciliated cells at their proximal ends to draw gametes into their respective tubes.  

Sperm is stored in three pairs of seminal vesicles prior to release.     Seminal receptacles receive sperm during copulation.  A small pair of ovisacs store eggs prior to release.

During mating, the two worms line up facing in opposite directions, with the ventral surfaces of the anterior ends in contact with each other.  This lines up the clitellum of one worm with the genital segments of the other worm.  The clitellum secretes a mucous sheath that covers the anterior halves of both worms and holds them in place.  Some species may have penile structures and/or genital setae (hairs) that hold them in place during mating.  In Lumbricus the sperm duct releases sperm which travel along the exterior surface of the body in sperm grooves, propelled by muscular contractions towards the seminal receptacle of the other worm.  In other oligochaetes the sperm duct openings and sperm receptacles will line up directly.  In either case, copulation takes several hours during which both worms give and receive sperm.  

Following copulation, the clitellum forms a cocoon for the deposition of eggs and sperm.  The worm backs out of the cocoon (which is mostly mucuous and albumen) and deposits both eggs and sperm inside as it does so.  Fertilization actually takes place in the cocoon, which is deposited in moist soil.  

Freshwater oligochaetes can also reproduce asexually by transverse division.  Basically the worm sheds half its body and both segments regenerate into fully developed worms.  

Any questions?

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Offline neilep

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Re: How do earth worms reproduce?
« Reply #6 on: 12/03/2005 22:57:01 »
warning...worm porn http://www.cco.caltech.edu/%7Ewormlab/movies/Rene_mating_movie.mpg

90 seonds of worm filth !!...(best for broadband users really !!)

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Re: How do earth worms reproduce?
« Reply #6 on: 12/03/2005 22:57:01 »

 

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