MONSTERS WITHOUT SPINE

TERRYFING INVERTEBRATES

Throw out the history of our planet we see thousands of terrible vertebrates but in this article we will do a trip in the world of terrible invertebrates.Invertebrates are the animals that haven’t spine.We will do it by time periods.Our first station is the Cambrian period,and the invertebrate that we will see is the king of those seas,Anomalacaris Earth’s first super predator,this 2m long monster owe his success to a remarkable evolutionary land mark,eyes,they may look bizarre but there aren’t unique,many predators in the Cambrian seas have also evolved eyes,and saw their prey.Anomalacaris was disappeared 500 million years ago by mysterious reason.The next station in this formidable  navigation is the next time period,the Ordovician.Here there are 2 killers,Orthocone  and Eurypterds.Eurypterids are arthropods in the family of scorpions.But they haven’t get on land already,they lived in the water and they haven’t big sting and small pincers,they have the opposite.They killed by claws in their pincers,they have 4 couples of legs to walk and flippers for swimming,a curly sting for fighting,a very small mouth to eat and powerful pincers.The claws in their pincers are also used as a spade to find their favourite food,hiding Trilobites.The other predator is a 11m long squid,the G.Orthocone.It catch it’s favourite food,Eurypterids [that are just 1m in length] by their giant tentacles,catch and then travel them in a sharp mouth to by eaten by this beast,but the biggest weapon that they used is a muscular tube that control the gases and water inside their cone,so they can go deep or sallow,fast or slow.Next invertebrate is from the Silurian period,Pterygotus is the titan of sea scorpions,3m long and at the size of an alligator,it’s the king of this seas.It’s a Eurypterid so he have the shame weapons with a Eurypterid and hunting tactics but with a change,they haven’t stings,suddenly they disappeared 410 million years ago with a mass extinction that ends the Silurian era.Next is the Devonian era but in this period there aren’t killer bugs so we go to the golden age of arthropods ,the Carboniferous era.But why is this the best period of arthropods?It’s because the oxygen levels were much higher than today’s.Today in our atmosphere is 21% oxygen,but in the Carboniferous era were 35%.Mesothelea spider is at the size of a human head,it’s an ambush predator,hiding on her underground burrow and then strike it’s prey,small lizards,our ancestors in this arthropod kingdom.The last invertebrate is the biggest arthropod ever,the Arhtropleura  hunted at the forest floor,it covered it’s body with trees and strike when it sense movement strike in spiders,dragonflies,reptiles and even amphibians.Arthropleura was 4m long and 250kg in weight.The deadliest invertebrates were only at the past but if the Oxygen levels start to go up and the arthropods be giants again, what will happened?