1. 
   Acanthostega
   Acanthostega (which means 'spine plate') was an early tetrapod that lived during the Devonian period (roughly 360 million years ago). This aquatic animal was about 60 cm (2 ft) long (includign its long tail). Its front limbs (and perhaps the rear limbs also) had 8 digits; it had internal gills and l...
   Found op http://www.enchantedlearning.com/subjects/dinosaurs/glossary/
   
   
2. 
   Acanthostega
   (from the article `community ecology`) By the Late Devonian the earliest tetrapods had appeared. Forms such as Ichthyostega and Acanthostega (both from eastern Greenland) are the ...
   Found op http://www.britannica.com/eb/a-z/a/9
   
   
3. 
   Acanthostega
   Acanthostega (meaning spiny roof) is an extinct labyrinthodont genus, among the first vertebrate animals to have recognizable limbs. It appeared in the Upper Devonian (Famennian) about 365 million years ago, and was anatomically intermediate between lobe-finned fishes and the first tetrapods fully ...
   Found op http://en.wikipedia.org/wiki/Acanthostega
   
   

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