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Have you ever wondered how all those lovely worms you find in your garden produce more little worms? These fascinating creatures are both male and female (hermaphrodite). They have both eggs(ova) and spermatozoa, although they are not self-fertilizing. An act of copulation is necessary in order that the eggs may become fertile.
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 The clitellum produces a mucous sheath and nutritive material, and as the sheath slides forward, it picks up ova from the earthworm's ovaries then packets of sperm that had been transferred to the worm from another worm during mating. As the clitellum sheath slides off the worm's head, the ends are sealed to form the cocoon.
Young worms hatch from their cocoons in three weeks to five months. The gestation period varies for different species of worms. It also depends on conditions like temperature and soil moisture. Hatching is delayed if conditions are poor, and cocoons may overwinter in soil to hatch in the spring.
Each cocoon holds from one to twenty fertilized ova or eggs-depending on the species and also nutrition of the adults laying them and environmental conditions like soil moisture. Usually only a few to several young worms successfully emerge from each cocoon. Earthworms can produce between 3 and 80 cocoons per year depending on the species. The deeper-dwelling species don't have to produce as many cocoons because they are protected much better from predation. Surface-dwelling species tend to produce many more cocoons. Worms mature in 10 - 55 weeks, depending on the species. Certain species could live 4-8 years. It depends on predators and environmental conditions. There seems to be some debate among worm "experts" on the length of a worm's life. I found other information suggesting worms may live up to 15 years again depending upon environmental conditions and species type.
The head of the worm is always located on the end of the worm closest to the clitellum. Place a worm on a rough piece of paper and observe which direction it travels. Earthworms usually extend their "head" first when crawling. The band closest to the head is the clitellum. This saddle-shaped, swollen area is about 1/3 of the way back on a worm's body. The clitellum secretes mucus to form the cocoon which will hold the worm embryos. The presence of the clitellum is the sign of a sexually mature worm. Here is more interesting information about the common earthworm. Lumbricus terrestris (Nightcrawler, Dew worm) is one of North America's largest earthworm species. It ranges in size from 9-30 cm with a diameter of 6-10 mm. A nightcrawler nearly 30 cm long (stretched out) and weighing 11.2 g was collected in a soybean field in Ontario, Canada. The largest tropical species are up to 120 cm long. The largest in the world are some Australian forms which may reach 300 cm in length. I want me one of those! My compost would be incredible.
Earthworms have bristles or setae in groups around or under their body. The bristles, paired in groups on each segment, can be moved in and out to grip the ground or the walls of a burrow. Worms travel through underground tunnels or move on the soil surface by using their bristles as anchors, and pushing themselves forward or backward using strong stretching and contracting muscles and can move both frontward and backward they tend to travel forward more.
If you cut an earthworm in half,the rear half will always die, and the front half may live to become another whole worm. This is called regeneration. The front part must be long enough to contain the clitellum and at least 10 segments behind the clitellum. This makes up about half the length of the worm. The new posterior segments grown will be slightly smaller in diameter than the original segments and sometimes a bit lighter in color. And they breathe through their skin. They need humid conditions to prevent drying out.
Worms appear slimy because they coat themselves in mucus, which enables dissolved oxygen to pass into their bloodstream. Worm casts are the earthworm's undigested waste (worm poop). Casts are composed of organic matter mixed with soil. They are held together with "gum" produced many active bacteria and mucus. This is why we gardeners love worms so much, they are so good for our soil.
Excerpts from Thomas J. Barrett's Harnessing the Earthworm(Bruce Humphries: Boston, 1947; copyright unrenewed.) and additional excerpts and picture courtesy of Worm World. Credit for the idea for this article goes all the Worm Lovers in the DG Soil and Composting Forum, who triggered a conversation on harvesting worms in the rain and it went downhill from there! Thanks guys!
 | Hubby and I have been doing Organic Gardening off and on for over 25 years. Just finishing the Virginia Master Gardening classes at the end of Nov 07. I love talking and teaching gardening to anybody that will listen. |
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Subject: WORMS
Posted by docgipe (from Montoursville, PA) on February 14, 2008 at 12:55 PM:Great subject good article. Thanks. ... Posted by doccat5 (from Fredericksburg, VA) on February 14, 2008 at 1:05 PM: You are most welcome :) ... Posted by Horseshoe (from Efland, NC) on February 14, 2008 at 6:27 PM: Yay! This article just may help convert more people to the fun life of wormdom!
Thanks!
Shoe ... Posted by doccat5 (from Fredericksburg, VA) on February 14, 2008 at 6:41 PM: Thanks, shoe. It's either that or I'm gonna get hauled in by the worm police for blabbing! LOL ... Posted by darius (from Appalachian Mtns, VA) on February 14, 2008 at 6:56 PM: A bit risque? LOL. Certainly educational, Thanks! ... Posted by jschweizer (from Fredericksburg, VA) on February 14, 2008 at 8:19 PM: Very interesting article.........Thanks! ... Posted by Zanymuse (from Fortuna, CA) on February 14, 2008 at 10:55 PM: I still think you should have titled this one "As the Worm Turns" ;~) ... Posted by rachel211 (from Springdale, PA) on February 19, 2008 at 8:39 AM: great informative article ... Posted by Hyblaean (from Niles, IL) on March 5, 2008 at 9:45 PM: Very neat article!! ...
Subject: oooh!
Posted by carrielamont (from Milton, MA) on February 14, 2008 at 9:36 AM:I always wanted to know that part about cutting a worm in half.... yuck, poor critter. Good job on "all the details, here." Thank you, Cathy.
xx, Carrie ... Posted by dryad57 (from Indianapolis, IN) on February 14, 2008 at 11:31 AM: YAY! I've been waiting for this article - excellent information Doc!! One question - would we know one of those cocoons if we saw it? Now that I know they're there - I don't want to inadvertently destroy it and lessen the potential worm population in my garden! ... Posted by doccat5 (from Fredericksburg, VA) on February 14, 2008 at 11:32 AM: You would know...worm mom's don't go far and their vicious, so watch out! LOL ... Posted by critterologist (from Frederick, MD) on February 14, 2008 at 11:07 PM: LOL
I did a quick search and found this page... [HYPERLINK@napi.ca]
Scroll down, and you'll find descriptions & photos of worm capsules/cocoons.
:-)
So... when worms come out after a rain and I rescue them from the sidewalk... are they escaping flooded burrows, or am I interrupting lovers' trysts? ... Posted by dryad57 (from Indianapolis, IN) on February 14, 2008 at 11:22 PM: Now for THAT answer, you must go here :)
[HYPERLINK@davesgarden.com] ... Posted by tcs1366 (from Itasca, IL) on February 14, 2008 at 11:30 PM: Critter -- i too am constantly picking them up off of my driveway... I just can't stand the thought of them getting squished.
docc -- oh, that was way more than i needed to know. Great article. ... Posted by nanny_56 (from Putnam County, IN) on February 14, 2008 at 11:34 PM: Well, I learned something new tonight!! lol ... Posted by doccat5 (from Fredericksburg, VA) on February 15, 2008 at 8:47 AM: Nanny, trust me you have NO idea.............LOL ... Posted by Bittybelly (from Hayes, VA) on February 18, 2008 at 7:24 PM: Great article...I really enjoyed this. Thanks !! ... Posted by doccat5 (from Fredericksburg, VA) on February 18, 2008 at 8:02 PM: YAVW....Bitty :) Worm porn on Dave's is hot stuff, LOL ... Posted by carrielamont (from Milton, MA) on February 18, 2008 at 10:02 PM: The only way we'll ever get porn on DG. (We must be really lame!) x. Carrie ... Posted by Bittybelly (from Hayes, VA) on March 29, 2008 at 9:31 PM: Porn....what porn???? Sorry looks like I started something! Did I start this or did
doccat5!! Bitty ...
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