Acrocanthosaurus means 'high-spined lizard' and it was a large theropod that lived in the Early Cretaceous period in the USA and Canada. Acrocanthosaurus was known for its high neural spines on its neck, back and tail. It is believed the spikes may have formed a low sail or supported muscle and flesh. Hand-painted dinosaur toy. Designed by experts, CollectA dinosaur models are factually accurate and true to life.