Kingdom Animalia Flashcards
What types of symmetry are animals classified by?
Radial
Bilateral
Asymmetrical
What is the organism that it is believed all animals are derived from?
Choanoflagellates
What are the three germ layers and what do they develop into?
Ectoderm –> body covering and nervous system
Endoderm –> gut lining and digestive organs
Mesoderm –> muscle
What does diploblastic mean?
An animal with 2 germ layers, the ectoderm and endoderm
What does triploblastic mean?
An animal with three germ layers, ectoderm, endoderm, mesoderm
What is an acoelomate? Give an example
Animals with no coelom. Eg flatworms
What is a pseudocoelomate?
They have a body cavity however it is not completely surrounded by mesoderm.
What is a coelomate?
An animal with a body cavity surrounded by mesoderm.
What are the defining characteristics of a protostomes?
Spiral cleavage
Blastopore –> mouth
Schizocoelous
What are the defining characteristics of deuterostomes?
Radial cleavage
Blastopore –> anus
Enterocoelous
Give two classes which are protostomes
Molluscs and arthropods
