Mr.B.Bug's TRILOBITE WORLD

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Trilobites are extinct sea creatures that were one of the first forms of life on earth.They ruled the world before the time of the dinosaurs during the Paleozoic Era, from the Cambrian Period to the Permian Period (between 545 and 251 million years ago).Trilobites are Arthropods(invertebrate animals having jointed bodies and legs),and were related to the lobster and crab.Their closest living relative today is the Horseshoe crab.
The name Trilobite refers to the creature's three lobes,or body sections,
consisting of a central axial lobe,and a pleural lobe on either side.
The three main parts of it's body are called the Cephalon,(head) the Thorax (body),and the Pygidium(tail).
There are 10 main orders of trilobites(Agnostida,Asaphida,Corynexochida,Harpetida,Lichida, Odontopleurida,Phacopida,Proetida,Ptychopariida,and Redlichiida).According to the latest literature,there are 20,541 valid species.Some trilobites crawled along the bottom of the sea in search of food,others were good swimmers,while the Agnostid trilobites are believed to have floated thru the water like plankton.Trilobites ranged in size from 1/4 of an inch,and smaller, to over 2 feet long.
Trilobites were also one of the first creatures to develop eyes and sensory organs.


TRILOBITE ANATOMY



STUDY QUESTIONS:
(See how many you can answer)
Answers are at the bottom of this page,
DON'T PEEK!

1.What are the three main parts of a trilobite's body called?
2.What kind of trilobites may have floated thru the water like plankton?
3.In what Era did trilobites live?
4.What is the closest living reative to the trilobite?

**BONUS QUESTION**
This is a tough one,but if you can answer it,you can be proud that you learned something very important in the study of trilobites:
(Question:)Name the ten main orders of trilobites.
(HINT:The easiest way to remember them is in alphabetical order.)



"The World's Biggest Trilobite" is a new species of Isotelus,which has been named Isotelus rex,and measures a whopping700 mm.long (or approximately 28 inches), while the world's smallest trilobite is a Bynumina lirae and measures only 1mm.long
(which is approximately the size of the head of a pin)

Isotelus rex

Photo Copyright© The Manitoba Museum


Bynumina lirae




ANSWERS:
1.Cephalon ,Thorax,Pygidium
2.Agnostids
3.Paleozoic Era
4.The Horseshoe Crab

BONUS QUESTION ANSWERS:
Agnostida,Asaphida,Corynexochida,Harpetida,Lichida,
Odontopleurida Phacopida,Proetida,Ptychopariida,and Redlichiida


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