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· DOC#003162
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grosse gurke said:
Serrasalmus do, it is one of the things that differentiate them from pygocentrus. They are palatine teeth.
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didnt frank say some weres that those werent really teeth but were more of a bone

and it really hard to find em on larger older fish , i hope im not mixing up fish here

 

· DOC#003162
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i had to go a look it up


These ectopterygoid teeth while useful for identification of species, can be worn with age and sometimes non-existent in older specimens like S. rhombeus. The lower jaw is actually two pieces held together at the center by tissue which acts like a glue. Only the genera Pygocentrus and Pygopristis lack these ectopterygoid teeth at all ages. The characins are the most heterodont fish group, that is, a group with very different teeth from one taxon to the other.
out of here for anyone who wants more
 

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yes and no: serras have palintine teeth, whih are really not teeth in the sense, but function as teeth. However these do not replinsh or grow, and are vrey worn down, if not compleetly missing in older fish. The pacu a close relative of the piranha however does have 2 rows of teeth.
 
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