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Characteristics of the Animal Kingdom
Transcript of Characteristics of the Animal Kingdom
•All animals are multicellular heterotrophs
•They are diverse in form
–Invertebrates are animal species that lack a backbone
–Vertebrates have a backbone
(about 1% of Kingdom Animalia)
•No cell walls
General Features of Animals
•Symmetrical objects have similar parts that are arranged in a similar manner
•Three types of symmetry
–Asymmetry – no pattern in parts
–Radial Symmetry – when a body is constructed around a central axis
–Bilateral symmetry – is when an animal is constructed with equivalent parts on both sides of a plane, includes a definite head end, known as cephalization
•A key transition in the evolution of the animal body was that of a body cavity.
–All bilaterally symmetrical animals other than solid worms have a cavity within their body
•Important for body design for:
–Circulation – fluids can move within the body cavity, permitting the rapid passage of materials from one part of body to another
–Movement – Fluid in cavity makes animal’s body rigid, making it harder for muscle contractions
–Organ Function – Body organs can function without body being deformed by surrounding muscles
Three basic kinds of body plans found in bilaterally symmetrical animals
Acoelomates – have no body cavity
Pseudocoelomates – have a body cavity called the pseudocoel located between the mesoderm and endoderm develops entirely
Coelomates – has a fluid-filled body cavity not between the endoderm and mesoderm, but rather entirely within the mesoderm, coelom, gut is suspended, along with other organ systems
Group of coelmates that develope their mouth opening first
Group of coelomate animals in which the first embryonic opening is the anus