Arthropods Flashcards
Where are trilobites found?
They’re only found in the ocean =, sediment we find them on was once underwater.
What’s their skeletonal compesition?
They have a calcium carbonate, calcite eyes lenses.
Schizochroal eyes meaning?
Seperated, Large Lenses
Horochroal Eyes Meaning?
That they have tightly packed lenses
What time period did they dominate?
They dominated and were widly diverse in the cambrian period, however they’re extinct today.
What’s special about their legs?
They have two undifferenteiated, appendages which split in to two parts; one used as a walking leg and the other a gillarch - bone supporting the gills.
They’re sectioned in x parts and what are these parts called?
3 parts. The Cephalon - head, the Thorax body and the Pygidium.
What’s ecdysis?
It means to shed skin. Trilabites used to shed their skin.
Taxonomy meaning?
This is the science of classifying organisms.
What are the different polymorphs of CaCO3 and what differentiates them from one another?
This is calcium carbonate. They are two types: Calcite which is found in deeper waters and is more abundant; and Aragonite which is found in shallower waters and is rarer than calcite.
What’s the Burgess Shale and what fossils were found/most abundant here?
The Burgess scale was a deposit in Canada, what makes it special is it highlightes the diversity of life in marine areas and it had a diverse range of soft bodied fossils. Marella splendens was an arthropod that lived during the Cambrian Period. It is the most common fossil in the Burgess Shale.
Where were their stomaches housed?
Inside the Gabella.
