After the cambrian-ordovician extinction. we now entered the ordovician period about 485-443.3 mya.
This period saw the diversity of trilobites that survive the extinction & emergence of various cephalopods like the cameroceras, arthropods like eurypterids and early jawless fish like aransaspis
As we can see. 2 arandaspis swims in the ordovician ocean near a huge 10 meter long cameroceras which likely fed on smaller arthropods.
It found...A young juvenile megalograptus
These arthropods are 75 cm long eurypterids but are actually predatory.
Megalograptus was also a bit distinctable from other sea scorpions. it's carapace which is a head plate was vaugely quadrastic in shape and flattened, lacking a marginal rim which was found in most eurypterids.
The cameroceras is about to strike, using it's appendages to attack & wound the megalograptus. it used it's pinchers/claws to fight back but it didn't let it go.
The cameroceras bit the megalograptus & crunch it into bits. the cameroceras finished it's prey & moves on...
Some Arandaspis are seen feeding on single-celled organisms
Arandaspis are about 15 cm long with a streamlined body covered in rows of knobbly armourex scutes. the front of the body & the head is protectef by hard plates with openings of eyes, nostrils and gills.and have no fins
But...443 mya is where the orbovician extinction takes place...
Global cooling and reduced sea levels triggered the ordovician-silurian mass extinction killing 85% of species that lived during this time period. it's also theorized that gamma ray burst may haved also triggered this event.
It was the 2nd largest mass extinction followed by 1st being the permian...
