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How Does Asexual Reproduction Work?

Recently, a weird story about a worm that has sex with it’s own head made headlines. What is asexual reproduction, and how does it work?

Read More:
Hermaphrodite Worm Has Sex With Its Head
http://news.discovery.com/animals/hermaphrodite-worm-injects-sperm-into-its-head-150630.htm
“One of the most unusual methods of reproduction has just been observed in a flatworm that uses its needle-like penis to stab itself in the head, which leads to egg fertilization.”

Ocellaris clownfish
https://en.wikipedia.org/wiki/Ocellaris_clownfish
“The ocellaris clownfish (Amphiprion ocellaris), also known as the false percula clownfish or common clownfish, is a marine fish belonging to the family Pomacentridae which includes clownfishes and damselfishes.”

Sequential hermaphroditism
https://en.wikipedia.org/wiki/Sequential_hermaphroditism
“Sequential hermaphroditism (called dichogamy in botany) is a type of hermaphroditism that occurs in many fish, gastropoda and plants.”

Special Starfish
https://en.wikipedia.org/wiki/Nepanthia_belcheri
“Nepanthia belcheri is a species of starfish in the family Asterinidae. It is found in shallow water in Southeast Asia and northeastern Australia.”

Starfish reproduction
https://en.wikipedia.org/wiki/Asexual_reproduction_in_starfish
“Asexual reproduction in starfish takes place by fission or through autotomy of arms. In fission, the central disc breaks into two pieces and each portion then regenerates the missing parts.”

Chopping up crown of thorns
http://www.advancedaquarist.com/blog/this-is-why-the-crown-of-thorns-starfish-are-so-nasty
“Divers attempting to eradicate them simply cannot cut them in half and expect them to die. Research confirms they can regenerate from fragments, similar to other starfish species.”
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