The Unstartled Steppes of Dream
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I am Ashley.
This is my personal blog. If you want just marine biology, go here.
I love the world; I really don't like people.
I balance all this animosity towards the human race with being an almost always kind and gentle being to all creatures.
I'm highly introverted and nature is my primary escape from people.
Creepy-crawly-slimy things are my favorites. Dinosaurs are fantastic.
Future marine biologist; presently an amateur entomologist, ichthyologist, artist, biologist, and writer.
Literature, video game, and music connoisseur.
I'm so full of passion for the world that it hurts.
I think a lot, I laugh a lot, I love a lot.
Almost none of the photos are mine and only some of the drawings are mine.
Listen in.

During Triassic, Jurassic, and Cretaceous times, evolution of reptiles, similar to that of the dinosaurs on land, occurred in the oceans. Between 252 and 227 million years ago, three groups appeared—turtlelike placodonts, lizardlike nothosaurs, and dolphinlike ichthyosaurs. Of these, only ichthyosaurs survived until the Jurassic.
The Jurassic ocean teemed with life. Modern fish groups were well represented, as were ammonites, mollusks, squid, and modern corals. A variety of ichthyosaurs evolved, some giant forms reaching 9 meters in length, but they soon died out and were replaced by modern sharks.
The gap left by the extinction of the placodonts and nothosaurs was filled by long-necked plesiosaurs. Those with a short body and tail and a small head lived in shallow water, while larger forms, called pliosaurs, probably lived in deep water. 

(Source: amnh.org)

— 10 months ago with 19 notes
#marine reptile  #triassic  #jurassic  #cretaceous  #reptile  #dinosaurs  #ichthyosaur  #plesiosaur  #fish  #ocean  #sea  #life  #nature  #marine biology  #biology  #evolution 
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