1. 
   Synapsida
   [n] - extinct reptiles of the Permian to Jurassic considered ancestral to mammals
   Found op http://www.webdictionary.co.uk/definition.php?query=Synapsida
   
   
2. 
   Synapsida
   subclass Synapsida noun extinct reptiles of the Permian to Jurassic considered ancestral to mammals
   Found op http://wordnetweb.princeton.edu/perl/webwn?s=Synapsida
   
   
3. 
   Synapsida
   (from the article `vertebrate`) ...temporal openings high up on skull; fishlike; spindle-shaped body; high tail fin; triangular dorsal fin; paddlelike legs; marine.Subclass ... ...tail (i.e., with the lower lobe longer than the upper). Limbs paddle-like; snout often elongated and beaklike.†Subc...
   Found op http://www.britannica.com/eb/a-z/s/199
   
   
4. 
   Synapsida
   The synapsida are a subclass of mammal-like reptiles now extinct.
   Found op http://www.probertencyclopaedia.com/browse/BSB.HTM
   
   
5. 
   synapsida
   1) Class 2) Subclass synapsida 3) Synapsida
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/synapsida/1
   
   

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