Builds kilometre long belts
cliffs and rocks, the barnacle is among the most important organisms
that filter plankton out of the water. It is often mussels
and barnacles that are the organisms that are mostly seen on wave exposed
beaches in temperate areas around the globe. In many places along the
northern coasts of the Atlantic and the Pacific, the Northern rock barnacle
Has a long penis to reach its neighbour
who is both male and female
Many organisms in the sea release eggs
and sperms into the water and let fertilization take place externally,
but for barnacles to reproduce they have to mate with each other. Because
they are stationary and
attached to the rocks, they have to mate with their closest neighbour.
This is accomplished by having a strong and stretchable penis, and that
all individuals are hermaphrodites, that is, they are both male and female
at the same time.
Barnacles seldom fertilize themselves, because their offspring
would not recieve a combinations of new genes. Because all sexually mature
neighbours have both eggs and sperm, the chances of successful mating
increases amongst the neighbours it can reach with its penis.
The picture above depicts mating northern
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