Chapter 33 Flashcards
(46 cards)
What is an invertabrete?
An animal without a backbone. Makes up 95% of animal species.
What is the Porifera Phylum?
Animals in the phylum are informally called sponges. Sponges are sessile animals lacking real tissue.
How do Porifera feed?
They live as suspension feeders, trapping particles that pass through the internal channels of their body.
What is the Cnidaria Phylum?
Cnidarians include corals, jellies, and hydras.
What is the body plan of the Cnidaria’s?
These animals have a diploblastic, radially symmetrical body plan that includes a gastrovascular cavity with a single opening that serves as both mouth and anus.
Which of the following statements about bilateral animals is false?
All bilateral are triploblastic (have three germ layers).
All bilateral have bilateral symmetry.
Most bilateral have tissues but some do not.
Many bilateral are invertebrates but some are not.
Most bilateral have tissues but some do not.
What are psuedocoeomates?
Animals with a functional body cavity lined by tissues derived from mesoderm and endoderm.
What is the primary species in the phylum Proifera?
Sponges.
What are filter feeders?
Animals that feed using a filter mechanism to strain small organism of food particles from the surrondings.
What type of feeders are sponges?
Filter feeders. They filter out particles suspended in the water and draw it into their body.
Water is drawn through the pores into a central cavity, the ______, and then flows out of the sponge through a larger opening called the ________.
Spongocoel
Osculum
What is the spongeocel?
Central cavity of a sponge.
What is the spongeocel?
Central cavity of a sponge.
What is the osculum?
A large opening in a sponge that connects the spongeocoelto the enviornment.
What is a choanocyte?
A flagellated feeding cell found in sponges. A.K.A. a collar cell, it has a collar like ring that traps food particles around the base of the flagellum.
Define invertebrate and identify approximately what percentage of known animal species they represent.
Animals that lack a backbone.
Account for more than 95% of known animals species.
Identify the trait that separates Eumetazoa from the sponges.
Lack true tissues and organs.
What is a placozoan?
A basal phylum of marine free-living (non-parasitic) multicellular organism called placozoans.
Why is a placazoan an animal?
They have a large number of genes 85% are coding for proteins that are also found in animals.
Where do we find placozoans?
In the sea.
Where do we place placozoans on the phylogenetic tree?
Start of Metazoa.
What is a trait that separates eumentazoa from sponges?
Lack true tissue and organs.
What is the body plan of a poriferian?
One large internal chamber, called a spongocoel, that is lined with water-filtering choanocyte cells.
Filter feeders
How do you sponges feed?
Capture food particles suspended in water that passes through body.
