Welcome Guest [Log In] [Register]
<div style="background-color: none transparent;"><a href="http://www.rsspump.com/?web_widget/rss_ticker/news_widget" title="News Widget">News Widget</a></div>
Hello, we here at Speculative Evolution have noticed a recent increase in the number of guests visiting our community. While being a guest does allow you to browse the forum at a basic level, it does not give you access to everything. There are many things that guests cannot see, and therefore we urge you to join our us so that you may contribute to our community and the projects we are undertaking. If you would like to register, please click the link below. If you are already a member, please ignore this message and log in. Thank you for your cooperation.


Join our community!

Username:   Password:
Add Reply
Anapsid, Synapsid, Diapsid?; just a quick question
Topic Started: Mar 8 2012, 11:00 PM (687 Views)
Bimasena009
Zygote
 *
Well, reptiles are classified by how many opening they had behind their eye socket, right? Say, if a reptile don't have holes beside their eyes and nostril, they are anapsid. One hole (on each side), then its a Synapsid (or Euryapsid). The Diapsid is even more confusing because modern examples has lost one or both holes (lizards and snake, respectively). The question is: aside from lightening the skull, what does the holes do? And why is it so important about it that they abandoned the Anapsid skull structure?

While we're on the topic, how do you differentiate between reptiles and parareptiles?
Offline Profile Quote Post Goto Top
 
JohnFaa
Member Avatar
Adveho in mihi Lucifer
 *  *  *  *  *  *  *  *  *  *  *
This idea is sorta of no longer considered valid; many "anapsids" might actually be diapsids that secondarily lost their frenestrae, for instance.
Edited by JohnFaa, Mar 19 2012, 05:38 PM.
Offline Profile Quote Post Goto Top
 
Spugpow
Member Avatar
Prime Specimen
 *  *  *  *  *  *  *
From here: http://rainbow.ldeo.columbia.edu/courses/v1001/8.html

"Fenestrae are thought to serve several possible purposes.
Most often they are to increase the area and improve the alignment or the attachment of major muscles.
They also serve to allow an area that expands outward for muscles that would otherwise be in a confined space.

They lighten the skull without compromising strength.

They occasionally have a gland in them, although this is unusual."
Offline Profile Quote Post Goto Top
 
Tartarus
Member Avatar
Adult
 *  *  *  *  *  *
JohnFaa
Mar 19 2012, 05:37 PM
This idea is sorta of no longer considered valid; many "anapsids" might actually be diapsids that secondarily lost their frenestrae, for instance.
If so, I suppose I may need to a rethink some of my views on amniote taxonomy.
Offline Profile Quote Post Goto Top
 
1 user reading this topic (1 Guest and 0 Anonymous)
« Previous Topic · Science Central · Next Topic »
Add Reply