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PetrosTrilobite

Ok, i know that barnacles are arthropods. But, i can understand the anatomy. It is a shell that the animal make for "home" and the animal is free from this, or the shell is part of the body? Can an adult barnacle moved?

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Tidgy's Dad

Barnacles (cirripedes) are free-swimming as larvae, After a few stages of growth they become anchored to the substrate and are from then on sessile, they can't move about as they are cemented to a hard substrate by a stalk or by their foreheads. The 'shell' is equivalent to the carapace of other crustaceans. usually this is fused to the body, but in some species held together by muscles. If you rip off their shells they will die.

Darwin was an expert on barnacles and spent eight  years studying them and reclassifying them in four volumes. He is reputed to have said, " I hate a Barnacle as no man ever did before, not even a sailor on a slow-sailing ship."  

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Ludwigia

Why don't you just google?

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PetrosTrilobite
Posted (edited)

Thank you @Tidgy's Dad. Now i understand!

@Ludwigia I search it in google but i don't find any good article, may because my english are not excellent.

 

Tomorrow i will go to find barnacles in a Pliocene formation in Greece (Rafina, nearly Athens). Some of these fossils can be very large, over 10 cm.

Edited by PetrosTrilobite
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Tidgy's Dad

I have barnacles from there! 

Concavus concavus

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20201213_004542-1.thumb.jpg.24fec73079d72b12e9815257bc1b2889.jpg

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Ludwigia
59 minutes ago, Tidgy's Dad said:

I have barnacles from there! 

Me too :D

 

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PetrosTrilobite

Nice! I found one large (7-8 cm/3 inch) and some small (1.5 - 2 cm/0.6 - 0.8 inch), and one partial.

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Ludwigia
1 hour ago, PetrosTrilobite said:

Nice! I found one large (7-8 cm/3 inch) and some small (1.5 - 2 cm/0.6 - 0.8 inch), and one partial.

Way to go! Want to show us them?

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PetrosTrilobite

 

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PetrosTrilobite

Forgot that the large barnacle is on a shell that have the same wide. With a so large barnacle, it was impossible for the clam to survive.

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