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Posted

I just came back after seeing footage of baby aligators being born, and what did I see dragged along behind the baby gators when they left the eggs? A placenta.

 

I didn't even know such a thing was possible. Are those really placentas attached to the baby aligators?

Posted

Some reptiles are vivparous, and have allantoplacentae - primitive placental organs. These are interesting from an evo-devo perspective in how vertebrates evolved from an egg laying state to a live bearing state.

 

http://onlinelibrary.wiley.com/doi/10.1002/jez.1402660508/abstract

http://www.ncbi.nlm.nih.gov/pubmed/16850472

 

An oviparous egg does not have a placenta in the traditional sense however, so what you saw would not have been aligator placentas: i.e.


amnioticegg.gif

Posted

I just came back after seeing footage of baby aligators being born, and what did I see dragged along behind the baby gators when they left the eggs? A placenta.

 

I didn't even know such a thing was possible. Are those really placentas attached to the baby aligators?

 

 

probably the remains of the yolk sac, not a placenta, the placenta is the connection between the mother and the baby, since alligators lay eggs it could not have been a placenta.

 

many non mammals have placenta like organs, some fish and sharks come to mind...

Posted

I've seen a similar piece of material hanging off other reptiles just after they hatched, i used to raise turtles and snakes, both lay eggs and have what appears to be placenta like material hanging off newly hatched individuals...

  • 4 weeks later...
Posted

While we're on the subject of childbirth in reptiles, here's another thing I need to know.

 

Do any of you know the gestation (if that terms is still applicable to reptiles) period for green iguanas?

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