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42 Cards in this Set
- Front
- Back
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Mutlicelled heterotrophic eukaryotes, require oxygen for aerobic respiration, motile at some stage, form a blastula during development, no cell walls, cells secrete extracellular matrix.
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Animals characteristics
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No true tissues
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Parazoa
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True tissues
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Eumetazoa
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Types of symmetry
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Radial and Bilateral
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Body parts arranged around their main axis
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Radial
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Equivalent right and left halves
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Bilateral
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Increase in cell size and number
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Growth
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Cell specialization
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Differentitaion
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Body parts forming
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Morphogenisis
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Fertilized eggs
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First stage is the zygote
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Embryonic development
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Growth
Differentiation Morphogenisis First stage is the zygote |
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Numerous mitotic divisions without growth, occurs until the morula stage is reached
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Cleavage
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Hollow ball of cells, inner fluid filled cavity.
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Blastula
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Invagination begins, forms two or three germ layers
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Gastrula
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Germ layers
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Ectoderm
Endoderm Mesoderm |
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Outer layer, epidermis and nervous system
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Ectoderm
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Inner layer, the gut
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Endoderm
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Most internal organs
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Mesoderm
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Blastopore becomes your mouth
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Protostome
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Blastopore becomes your anus
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Deuterostome
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Region where food is digested and then absorbed. Saclike.
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the gut
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Marine and fresh water
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Habitat
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Trap food from water flowing through pores in its walls
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Phagocytic collar cells
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Nerve cells threading through tissue layer, controls contractile filaments, contraction causes changes in shape that move the body, hydrostatic skeleton
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The nerve net
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Jellyfish
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Scyphozoans
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Sea anemones and corals
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Anthozoans
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Bilateral, unsegmented, complete digestive system, free-living or parasitic, hydrostatic skeleton
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Roundworms
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bilateral, soft bodied, muscular foot, radula
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Mollusks
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Twisting of body parts during larval development
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Gastropods
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Streamlined, active swimmers, all move by jet propulsions
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Cephalopods
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Bilateral, segmented, complete digestive system, setae, hydrostatic skeleton,
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Annelids
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Most are marine, bristles extend from paired, fleshy parapods on each segment, head end is specialized
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Polychaetes
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Predators and parasites, less obvious body segmentation, Most have sharp jaws
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Leeches
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Most diverse phylum
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Anthropods
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Horseshoe crabs and sea spiders
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Aquatic
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most are marine, some freshwater, a few terrestrial
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crustaceans
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Segmented bodies with many legs
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Centipedes or millipedes
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Most diverse groups of animals
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Insects
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only winged invertebrates
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insects
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Decentralized nervous system. No concentration of nerve cells in a brain. allows them to detect and respond to food, danger, and mates in any direction.
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Echinoderm Nervous system
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Unique to echinoderms, tube feet connected to canals, controlled water flow extends feet in a coordinated way
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The water-vascular system
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Unique to echinoderms, tube feet connected to canals, controlled water flow extends feet in a coordinated way
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The water-vascular system
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