bio test 3 Flashcards
Oldest type of animal
* Barely multicellular
Three types of cells
Obtain food through filter feeding
Live mainly in ocean, but some freshwater
sponges
Entirely aquatic
* Radial symmetry
* Two growth forms:
– Polyp
– Medusa
Gastrovascular Cavity – incomplete digestive
system
* Nematocyts
Cnidarians
Flatworms
* Entirely aquatic or at least moist soil
* Bilateral symmetry
* Simple sense organs
Some are free-living, many are parasites
Platyhelminthes Characteristics
Segmented worms
* Aquatic or in moist soils
* Most free-living
– Detritovores
– Filter feeders
Some are parasites
* Earthworms, feather duster worms, leeches
Annelida
The second largest phylum
– 90,000 living spp
* Have colonized almost all habitats –
deepest ocean to forests to deserts
Well-developed organ systems
* Includes:
– Snails, Slugs, Clams, Mussels, Oysters,
Squids, Octopuses, and Nautiluses
Mollusca
a tonguelike organ with teeth in mollusks like snails
radula
Eat plankton and detritous
filter feeders
Bivalve
High levels of
intelligence
* Predators
* Found in ocean
only
Cephalopods
Overwhelming majority of phylum
Chordata
64,000 spp. described
– 4% of all described animal spp.
– Jawless fish, jawed vertebrates (including
sharks and rays), and bony fish
The vertebrates
not Jaw =
Agnathans
Jawless fish-like creatures
– Hagfishes
– lampreys
* Oldest group of vertebrates
Largely marine, some freshwater
* Scavengers or parasites
Agnathans
vertebrates with jaws
Gnathostomes
cartilage fish =
Chondrichthyes
Jawed fishes with cartilaginous skeleton
* Mainly marine, few freshwater
* Many are predatory, some filter feeders
3 main groups: chimeras, skates/rays,
sharks
Chondrichthyes
having rays and fin
Actinopterygii
Fishes with bony skeleton and flimsy ray
fins
* Most diverse group of vertebrates
* Most predators, but herbivores, frugivores,
filter-feeders
* Found in nearly every aquatic habitat
Actinopterygii
Most spp spawn eggs
– Fertilized externally
– Male insemination after female lays eggs
– Eggs desiccate under dry conditions
Bony Fish Reproduction
Lobe-finned fishes
* Only 8 spp living
* Fins attached to body via bone
Lungs and Gills
* Large, fleshy pectoral fins
Sarcopterygii
Which of these terms does NOT go with the kingdom Animalia
Unicellular
Pizza! what kind of symmetry does this pizza have
radial symmetry
Which of these groups are called flatworms
Platyhelminthes
Which of these groups has far and away more species than the others?
Insects
Vertebrate animals like salamanders make up a majority of all animal species
False
Which of these is the oldest group of vertebrate animals
lampreys and hagfishes
Which of these characters does NOT apply to the chondrichthyes?
Bony skeleton
What are the fleshy, lobed fins of sarcopterygians an adaption for
Navigating through shallow weedy waters
Fish (Actinopterygii) eggs are fertilized internally, meaning that the sperm fertilizes the egg inside the female’s body.
False
