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An animal that lacks an internal body cavity (coelom)
In animals, one of the three basic types of tissue formed during gastrulation; gives rise to all other tissues
A type of metamorphosis in which the animal increases in size from one stage to the next, but does not dramatically change its body form. Also called incomplete metamorphosis.
A type of metamorphosis in which the animal completely changes its form. Also called complete metamorphosis.
- A major lineage of protostomes (Liphotrochozoa) that grow by extending the size of their skeletons rather than by molting. Many phyla have a specialized feeding structure (lophophore) and/or cilitated larvae (trochophore).
- 3.Segmented worms
- A major lineage of protostomes (Ecdysozoam) that grow by shedding their external skeletons (molting) and expanding their bodies.
The free-floating stage in the life cycle of some cnidarians
The middle of the three basic cell layers in most animal embryos; gives rise to muscles, bones, blood, and some internal organs (kidney, spleen,etc.).
The outermost of the three basic cell layers in most animal embryos; gives rise to the outer covering and nervous system
Lophtrochozoan: Mollusca. Trioblastic/Bilaterally symmetric Protosomes
Producing eggs that are laid outside the body where they develop and hatch.
Producing eggs that are retained inside the body until they are ready to hatch.
producing live young (instead of eggs) that develop within the body of the mother before birth(Live Bearing)
what defines an animal?
- 2.Move voluntarily
- 4. Respond rapidly to stimuli
are slime molds multicellular?
Only during reproductive phase
animals whose embryo have two types of tissue
Germ layers are only found in?
two groups of animal that are diploblasts
- 2.Ctenophora(comb jellies)
- -filter feeder
- -specialized cells lack neurons
Cnidarians have nerve net?
Yes, cnidarians and ctenophoresmhave have nerve net because they are radially symmetric..need nerves around entire body
at least two planes of symmetry..if were to cut diagonal, would be identical
why was the evolution of a body cavity important?
-coelem:enclosed, fluid-filled cavity, creates a container for the circulation of oxygen and nurtients
Do cnidarians and ctenophores have a coelem?
why was the coelom a critically important innovation during animal evolution?
-because an enclosed, fluid-filed chamber, can act as an efficient hydrostatic skeleton
What did the evolution of the coelom provide for animals?
the evolution of the coelom gave bilaterally symmetric organism the ability to move effeiciently in search of food
"first-Mouth", in which the mouth develops before the anus
"second mouth". in which the anus develops before the mouth
Vast majority of animals are_____and humans are________
vast majority of animal species are protosomeshumans are deuterostomes
Tube within a tube design
-the inner tube is the gut, the outer tube forms the body wall
animals that have long, thin, tubelike bodies that lacks limbs
The closest living relatives of animals
- they are not multicellular because they are not animals
Sponge feeding cells
Which evolved first...bilateral or radial symmetry?
- protostomes that lack coelom
what triggered the diversification of species within each lineage?
the evolution of innovative methods for sensing the environment
which symmetry are sponges mostly?
asymmetrical but some are radial
small groups of adult cells have the capacity to develop into a complete adult organism
how was the evolution of mesoderm associated with the evolution of coelom?
mesoderm made it possible for an enclosed, muscle-lined cavity to develop, creating a coelom
animals with what type of symmetry underwent cephalization?
the evolution of bilateral symmetry provided for_____and triggered______
efficient movement and triggered the development of cephalization
- 1.Jellyfish, corals, anemones
- -cnidocyte:stinging cell
- -radially symmmetry
- -first animal with tissues
- -alternation of generation
- Comb Jellies
- -not radially symmetric
- -Lives in pond water/soil
- -free living flat worms
- -endoparasitic tapeworms
- -no gut,stomach,mouth or digestive tract
- -endo-or ectoprarsitic flukes
- -can have multiple host species
- 1.Segmented worms
- -very diverse
- -most are free living
two forms of annelida
- 2.Clitellata-"no feet"
major lineages of mollusks
- 3. gastropods
- 1.use radula to scrape radula off algae
- 2.Brightly colored shells
- 3.Most primitive in phyla
- 4.Open circulatory system
- both aquatic and terrestrial
- General body plan:
- 1.Foot to glide along
- 2.visceral mass
- sea hare
- -have the biggest nerve cell
- -have closed circulatory system(Only Mollusks)
- -cuticle-live in extremely diverse habitats
- 1.bivalves (clams, oysters)
- 2.gastropods (snails, slugs),
- 4.cephalopods (squid, octopuses).
Mollusk body plan
- Distinguished by a body plan with three
- main parts:
- 1.a muscular foot
- 2.a visceral mass
- 3.a mantle
- 1.Most primitive cephalopods
- 2.eye is basically a hole
- 3.Has siphon:takes water in and uses it to move
- 4.Have chromatophores: have changing pigmentation