Sturgeon lips

Short one today.
Sturgeons don’t have teeth. The mouth is an extensible tube below the back of the skull that extends to probe the muddy bottom searching for prey.

Figure 1. Skull of Pseudoscaphorhynchus. Note the mouth is created by the lacrimal and surangular, not the maxilla and dentary, which are tooth-bearing bones in more derived fish.

Figure 1. Skull of Pseudoscaphorhynchus. Note the mouth is created by the lacrimal and surangular, not the maxilla and dentary, which are tooth-bearing bones in more derived fish.

Note the mouth is created
by the lacrimal and surangular, not the maxilla and dentary, which are tooth-bearing bones in more derived fish. The quadrate is attached to the articular, but not attached to the lacrimal and surangular.

 

 

 

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