FREE PORN VIDEO'S

by **admin_pornrev** » Wed Dec 25, 2013 2:47 am

Sea Slug Has Disposable Penis

FROM: http://news.discovery.com/animals/sea-s ... 130211.htm

Feb 13, 2013 07:00 PM ET // by Jennifer Viegas

Stephen Childs/Flickr
Related Links
Two-Thirds Marine Species Remain Unknown
World's Best Marine Reserve: Cabo Pulmo: Photos

A sea slug's unusual mating behavior -- it discards its penis after copulation, grows a new one, and has sex the next day -- is reported in the latest issue of Biology Letters.
The sea slug, Chromodoris reticulata, is a type of soft-bodied marine mollusk, and its disposable penis is very rare in the animal kingdom.

As for what happens after sex ... "The penis just falls off," lead author Ayami Sekizawa told Discovery News.

: a sea slug 2.jpg (180.57 KiB) Viewed 11457 times

PHOTOS: Small World Under the Sea

Sekizawa, a researcher at Osaka City University, and colleagues made the discovery after studying C. reticulata individuals that they collected during scuba diving trips in shallow coral reef areas near Okinawa, Japan.

The researchers set up an experiment tank and watched as the sea slugs copulated 31 times.

These animals are "simultaneous hermaphrodites," meaning each performs both the "male role" of donating sperm to a mating partner and the "female role" of receiving sperm from the partner simultaneously during copulation.

A typical mating episode involves two individuals touching each other with their genital orifices. They then "project" their penises and each insert them into the other’s vagina and start copulation. After a short time, one removes its penis from the partner. Later, the other mate removes its penis too.

Both individuals then crawl away, with their elongated penises still dangling. The sexual organs, which feature backward-pointed spines for possibly trapping rival sperm, would then suddenly sever from their bodies and float away.

"The sea slug sheds 1/3 of the internal penis length after each copulation," Sekizawa said. "The sea slug is able to grow the penis gradually to its original length."

PHOTOS: Bizarre Deep-Sea Reef Creatures Discovered

The loss and regrowth doesn’t seem to hamper the sea slug’s active sex life.

"In one case," the researchers wrote, "we observed three successive copulations each separated by approximately 24 hours."

Sekizawa said that "we have no idea about the evolutional conditions for this unique mating behavior."

Only a few other animals have been found to "dispose" of their penis, or male reproductive appendages.

One other is Argonauta, a type of octopus. Some orb-weaving spiders will also shed organs used for mating.

Earlier studies on the periwinkle, a type of edible sea snail, found that they shed their penises after the reproductive season "probably to save the cost of maintenance," Sekizawa and his colleagues believe.

That tactic, however, may not apply to the sea slug, since it has to keep regrowing its penis.

Janet Leonard, a research associate at the University of California at Santa Cruz Institute of Marine Sciences, told Discovery News that she agrees with the new paper’s conclusions and that "similar phenomena (occur) in other species."

"Little is known about mating behavior in simultaneously hermaphroditic animals," Sekizawa said. "The disposable penis in our nudibranch (sea slug) study is merely one case of peculiar mating behavior" in these animals."

Recommended for you

Article
WhatDoesHorseMeatTasteLike?

Gallery
FacesofOurAncestors

Article
HowBirdsGotTheirUVVision

Article
GooLetsTurtleMomsPauseEggs'Growth

Top12MostAmazingSnakes

Article
MurderousGreatTits

Article
AsteroidKilledtheDinosaurs:NewEvidence

Post a Comment

Login

John Doeson2 hours ago
Wow - talk about "blowing your load".
Reply
0

Ads by Google
China's Boom Set To Bust? Shocking Truth about China's Boom.Get a Free Copy of the Report Now!
http://www.MoneyMorning.com.au
Need Merchant Account ? Online payments, Easy Integration,Global Coverage,All-In-One.Ask Now!
SafeCharge.com
Sarah Blasko Live Introducing: Live at The House. Anew live music series.Subscribe now
youtube.com/liveatthehouse
D News Video

DNews: Sex in Space: How It's Done

DNews: Could SpaceX Save the Dreamliner?

DNews: Dung Beetles Use Milky Way as Compass

DNews: The Weird History Behind Groundhog Day
The Must Reads

10 Most Intriguing Popes

The World's 'Eight-Thousander' Mountains: Photos

Eyewitnesses to Snowstorm Nemo's Wrath

Latin a Dead Language? Not Really

Get to Know Your Banned Substances: Photos
The Mind Blowers

Why Coffee Doesn't Go in Your Butt

Woman Drank Herself to Death with Coca-Cola

How Birds Got Their UV Vision

Top 12 Most Amazing Snakes

People in the US Still Die from Black Death
the // radar

DNews Stormtracker

Benedict XVI Not the First Pope to Resign
Although it has been very rare, popes have stepped down -- whether under duress or deficiency of strength. ->

Is Apple Developing a Smart Watch?
Inside sources confirm that Apple is working on an iWatch made of curved glass. ->
Ads by Google
Watch Full Episodes
Turn Your Computer into a TV!Watch Full TV Episodes w Free App
http://www.TelevisionFanatic.com
Brain Training Games
Improve memory with scientificallydesigned brain exercises.
http://www.lumosity.com
Buy Ink & Toner Australia
Australia Wide - Sales On Now @Fast Overnight Delivery Save 76%
http://www.InkStation.com.au/Cartridge
Our Sites
• Animal Planet
• Curiosity
• Discovery Channel
• Discovery Kids
• Discovery Fit & Health
• Military Channel
• Investigation Discovery
• Oprah Winfrey Network
• Destination America
• Science Channel
• TLC
• Velocity
• Discovery News
• HowStuffWorks
• Consumer Guide Auto
• Petfinder
• Revision3
• TreeHugger
• Discovery Education
• Student Competitions
• Discovery Access
• Discovery Retreats
• Discovery Music Source
Video
• Discovery News Video
Shop
• Discovery Store
• DVDs & Books
• Custom Gear
• Toys & Games
• Gift Sets
• Sale
• Discovery Adventures
• Student Adventures
• Discovery Times Square
• Discovery Corporate Sales
Stay Connected
• Email Newsletters
• RSS
• Twitter
• Facebook
Corporate
• Discovery Communications, LLC
• Viewer Relations
• Advertising
• Careers @ Discovery
• Privacy Policy
• Visitor Agreement
Copyright © 2013 Discovery Communications, LLC. The number-one nonfiction media company.

FREE PORN VIDEO'S

Sea Slug Has Disposable Penis

Sea Slug Has Disposable Penis

Who is online