Shmuel Bentov of Ben-Gurion
University and his colleagues have found that one type of freshwater crayfish (Cherax
quadricarinatus) has an enamel-like
coating over its molars. Right now, I’m imagining Sebastian the crab from
Disney’s The Little Mermaid breaking into a toothy grin. That’s not quite what
the researchers found.
In reality, crayfish look like
this:
They do not have teeth that look
like this:
Digital image created by Sam Fentress 7 June, 2005. |
They do however have mandibles
with a grinding surface that are analogous to our molars.
Teeth have a hard outer surface, a
softer, more pliable center for absorbing shock and tension, and a binding
layer between the two. For vertebrates such as ourselves, the outer layer is
composed of calcium phosphate hydroxyapatite. Invertebrates have employed a
number of minerals to harden their teeth including calcium carbonate, iron
oxide and silica, but crystalline apatite has not been one of them. Apparently,
C. quadricarinatus has not been keeping
up with the literature because its mandibles contain fluorapatite crystals that
are quite similar to the apatite crystals in our teeth.
I wonder what would happen if a crayfish sat in a cup of Energy drink for 15 minutes...
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