PALEOZOO

PALEOZOO
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Trilobites had remarkable compound eyes made up of thousands of hexagonal calcite cells. These cells acted as individual lenses and were very durable with some even able to polarize light. It is presumed that many trilobites had excellent vision. There are indications that a few trilobite species even developed forward depth of vision which has added to the speculation that some trilobites evolved into agile hunters that swam in search of prey.

Trilobites had remarkable compound eyes made up of thousands of hexagonal calcite cells. These cells acted as individual lenses and were very durable with some even able to polarize light. It is presumed that many trilobites had excellent vision. There are indications that a few trilobite species even developed forward depth of vision which has added to the speculation that some trilobites evolved into agile hunters that swam in search of prey.

There have been over 20,000 different species of trilobite discovered. They exhibit numerous anatomical adaptations that helped them survive in almost every niche of the marine environment. Because of their wide variety and distribution over such an extensive period of time, trilobites have become the most important index fossil for evolutionary biologists.

There have been over 20,000 different species of trilobite discovered. They exhibit numerous anatomical adaptations that helped them survive in almost every niche of the marine environment. Because of their wide variety and distribution over such an extensive period of time, trilobites have become the most important index fossil for evolutionary biologists.

An extinct marine arthropod of the class Trilobita from the Paleozoic Era with a flattened oval body and a segmented exoskeleton divided into three parts.Trilobites were one of the most successful class of animal in the history of the planet existing for over 300 million years, spanning almost the entire Paleozoic Age. Though predominantly found in the shallower margins, trilobites were abundant throughout the oceans of the world and their fossil remains have been found on every continent.

An extinct marine arthropod of the class Trilobita from the Paleozoic Era with a flattened oval body and a segmented exoskeleton divided into three parts.Trilobites were one of the most successful class of animal in the history of the planet existing for over 300 million years, spanning almost the entire Paleozoic Age. Though predominantly found in the shallower margins, trilobites were abundant throughout the oceans of the world and their fossil remains have been found on every continent.

Eurypterus was multi-segmented and would have been quite flexible with a sharply spined tail (telson). Its distinctive broad hind legs may have allowed for some limited crawling or upward leverage motion but they would have been much more useful as swimming appendages enabling the Eurypteridae to row or aquaplane through the water column.

Eurypterus was multi-segmented and would have been quite flexible with a sharply spined tail (telson). Its distinctive broad hind legs may have allowed for some limited crawling or upward leverage motion but they would have been much more useful as swimming appendages enabling the Eurypteridae to row or aquaplane through the water column.

With their semicircular head shields and broad paddle-like hind legs, Eurypteridae were some of the most distinctive creatures to roam the ancient shallow seas and they are presumed to have been predacious.    Like other arthropods before it Eurypterus had excellent sight with large crescent shaped compound eyes that would have given it a wide field of vision.

With their semicircular head shields and broad paddle-like hind legs, Eurypteridae were some of the most distinctive creatures to roam the ancient shallow seas and they are presumed to have been predacious. Like other arthropods before it Eurypterus had excellent sight with large crescent shaped compound eyes that would have given it a wide field of vision.

The Silurian Period (444 - 416 mya) was the time of the great sea scorpion arthropods.  Other marine arthropods such as trilobites had existed right across the globe in huge numbers for millions of years, with some possibly even moving up onto dry land, but now the Eurypteridae would become the dominant lifeform.

The Silurian Period (444 - 416 mya) was the time of the great sea scorpion arthropods. Other marine arthropods such as trilobites had existed right across the globe in huge numbers for millions of years, with some possibly even moving up onto dry land, but now the Eurypteridae would become the dominant lifeform.

Remarkably intact fossil specimens of the Gogo Fish, along with other placodermi, have been discovered in the Gogo formation of Western Australia. Fossil remains are typically flattened in form due to geological pressure over time but the Gogo remains were uniquely encased within limestone nodules.  After careful dissolving of the surrounding limestone fully intact specimens have emerged.  This has allowed for a much greater understanding of the anatomical structure of placodermi.

Remarkably intact fossil specimens of the Gogo Fish, along with other placodermi, have been discovered in the Gogo formation of Western Australia. Fossil remains are typically flattened in form due to geological pressure over time but the Gogo remains were uniquely encased within limestone nodules. After careful dissolving of the surrounding limestone fully intact specimens have emerged. This has allowed for a much greater understanding of the anatomical structure of placodermi.

It has been speculated that the armoured bite of the more predatory placoderms evolved as an effective means of cracking through the shelled defences of the plentiful arthropods. It has been noted that at around the same evolutionary time trilobites began to appear with a profusion of spines, possibly as a counter defence to the predatory placoderms.

It has been speculated that the armoured bite of the more predatory placoderms evolved as an effective means of cracking through the shelled defences of the plentiful arthropods. It has been noted that at around the same evolutionary time trilobites began to appear with a profusion of spines, possibly as a counter defence to the predatory placoderms.

A placoderm of the Middle to Late Devonian that inhabited the ancient reef system of north Western Australia.   With its large eyes, articulated jaw and razored dentition plates the Gogo Fish (Mcnamaraspis Kaprios) would have been a formidable predator. Gogo Fish is a member of the order Arthrodira, meaning ‘jointed neck’ and like others in that order it would have been able to attack and eat creatures that were not very much smaller than itself.

A placoderm of the Middle to Late Devonian that inhabited the ancient reef system of north Western Australia. With its large eyes, articulated jaw and razored dentition plates the Gogo Fish (Mcnamaraspis Kaprios) would have been a formidable predator. Gogo Fish is a member of the order Arthrodira, meaning ‘jointed neck’ and like others in that order it would have been able to attack and eat creatures that were not very much smaller than itself.

A number of massive head and thorax fossils of Dunkleosteus have been found around the world but to date no trace of the soft body parts has been uncovered. This means that much about the overall anatomy of these creatures is still speculative and largely based on associations with other placoderms.

A number of massive head and thorax fossils of Dunkleosteus have been found around the world but to date no trace of the soft body parts has been uncovered. This means that much about the overall anatomy of these creatures is still speculative and largely based on associations with other placoderms.


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