biodiversity of animals Flashcards
what is the kingdom of animalia divided into
-invertebrates: no vertebral column
-vertebrates: has a vertebral column
what are the six phyla of invertebrates and vertebrates
-phylum porifera: sponges
-phylum cnidaria: jelly fish
-phylum platyhelminths: tapeworms
-phylum annelida: earth worms
-phylum arthropoda: crab, spider
-phylum chordata: mammals
what are the three types of symmetry
-asymmetry: no symmetry
-radial symmetry: cut through more than one vertical plane to obtain two equal halves
-bilateral symmetry: identical left and right side
what is cephalisation
when the sense organs, feeding appendages and the brain are near to the anterior part of the body
what are the tissue layers
-germ layers: differentiate into different organs:
ectoderm (outer), endoderm (inner) mesoderm (layer between)
what are diploblastic animals
-have both ectoderm and endoderm germ layers
what are triploblastic animals
-has all three germ layers
what is a coelom
-internal fluid-filled cavity that develops in the mesoderm on triploblastic animals
what is an acoelomate
-animals without a coelom
what is a pseudocoelomate
-some triploblastic organisms have a body cavity that is NOT surrounded by a mesoderm
what is a coelomate
-animals have a body cavity or true coelom in their mesodermal tissue layer
describe the phylum: symmetry, tissue layers, gut type, coelom if any and mode of life: porifera
-asymmetrical (no cephalisation)
-no tissue layers
-no openings to guy
-acoelomate with no blood system
-aquatic, sessile
describe the phylum: symmetry, tissue layers, gut type, coelom if any and mode of life: cnidaria
-radial symmetry with no cephalisation
-diploblastic
-one opening that acts as mouth and anus
-acoelomate (no blood system)
-aquatic
describe the phylum: symmetry, tissue layers, gut type, coelom if any and mode of life: platyhelminthes
-bilateral (with cephalisation)
-triploblastic
-one opening
-acoelomate with no blood system
-parasitic, aquatic
describe the phylum: symmetry, tissue layers, gut type, coelom if any and mode of life: annelida
-bilateral (w cephalisation)
-triploblastic
-through gut
-closed blood system as blood is restricted to blood vessels
-aquatic or terrestrial
