Gastropods have coiled shells often known as snails, today they live on land freshwater, and in the sea.
Gastropods get food from plants, filtering the water, and some are carnivores which eat other animals.
Some gastropods are scavengers, feeding on dead plant or animal matter; others are predators; some are herbivores, feeding on algae or plant material; and a few species are external or internal parasites of other invertebrates.
The jawless fish internal skeleton is not bony but cartilaginous
The jaw-less fish was one of the most widespread fish of the Silurian.
Instead of a jaw it has an unhinged circular mouth
What Silurian life looked under the water
- Cooksonia had stems but no leaves.
- Some had special tissues that carried water and nutrients upwards to the branching parts of the plant. Though vascular tissue in plants is common today, it was a first of that time.