Animalia Flashcards
What are the two groups of Animalia?
Vertebrates and Invertebrates (make up 98% of all animals).
What’s Phylum Chordata?
It’s basically the 2% of animals that have a a backbone or a Notochord. They are vertebrates.
All animals share what characteristics?
They are heterotrophic and are multicellular eukaryotes as well as the absence of a cell wall.
What characteristics do only some animals possess?
Some are motile and have differentiated tissue and sexually reproduce w/t the diploid stage at the end of the life cycle.`
What are the three types of body symmetry and what do they mean?
1) Bilateral (two similar halves)
2) Radial (Body parts arranged in a circle with one central point)
3) Asymmetrical (no orderly body plan)
What’s the purpose of a gut?
It enables the creature to eat food outside of it’s cells. If there is no gut, the food is digested inside the cells.
Complex animals hold a body cavity which hold the gut & other organs.
What’s Phylum Porifera?
(Sponges)
They are pore bearing organisms that are asymmetrical and lack tissues or a body cavity. Adults are sessile, larvae are motile.
all possess a canal system through which water is pumped. Nutrients can then diffuse into the sponge cells.
What’s Phylum Cnidaria?
(jellyfish, sea anemones, coral, and hydra)
Have Radial Symmetry and no body cavity. Could be sessile or motile.
have differentiated cells that are organized into two layers of tissues and nerves that form a network.
Most have specialized stinging cells (cnidocytes).
Flatworms?
(Phylum Platyhelminthes)
Are the simplest animals, have bilateral symmetry. Have sac-like gut but no body cavity. Digest via secretion.
think of tapeworms.
Roundworms?
(Phylum Nemotoda)
simplest animals with a complete gut that goes from mouth to anus..
Segmented worms? (earthworms)
(Phylum Annelida)
bodies are divided into different segments.
all show bilateral symmetry and have a true body cavity.
Phylum Mollusca? (Snails)
(Snails, clams, and squids)
mollusks have bilateral symmetry + true body cavity.
usually has foot, gut, mantle, shell.
nervous system can range from simple (clam) to complex (octopus).
Phylum Arthropoda?
Insects, spiders are crustaceans.
Segmented bodies, all possess exoskeletons.
Has head, thorax and abdomen.
Phylum Echinodermata?
Star fish and sea urchins alike.
Radial Symmetry, internal skeleton, spiny skin and body cavity.
Has vascular system.
Difference between Protostomes and Deuterostomes?
Protostomes are Spiral and determinate while the latter is radial and indeterminate.
