Early Paleozoic Flashcards
What are some significant signs during Precambrian transfer to Cambrian?
Microbial mats decrease, bioturbation increases
Early Cambrian is the time during ____
542-509 million years ago
The Cambrian marks the transition from ______ covered sea floor to ________ seafloor.
Microbial mats, bioturbation
Life on earth can be divided into groups, each more exclusive than the preceding group. Please name all groups in order
Kingdom, phylum, class, order, family, genus, species
What is the name of the system classify animals?
Taxonomy
What animals emerged during Cambrian explosion?
Sponges, mollusks, anthropoids, echinoderms
Over the course of the Phanerozoic eon, there have been recognized three ____
Evolutionary faunas
What are three evolutionary faunas?
Cambrian, Paleozoic, modern
What are some animals emerged during Cambrian?
Echinoderms, eocrinoids, helicoplacoids, edrioasteroids
Echinoderms were ______
Sedimentary stickers
What is the difference between eocrinoids and modern crinoids?
Instead of holdfast(root), eocrinoids had a blunt stem
Helicoplacoids also lived as _____ with their_____ stuck into the seafloor
Sedimentary sticker, blunt stem
What is the first arthropods of the Cambrian?
Trilobites
The name trilobite came from_____
The fact that their body contains three lobes
What are the three parts of trilobite?
Cephalon, thorax, pygidium
