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Objectives
• Describe characteristics common to animals
• Describe the characteristics of major animal phyla
• Identify on sight members of major animal phyla
• Define animal, chordate, vertebrate, invertebrate
Characteristics of animals
• Multicellular• Eukaryotic• Heterotrophic• Sexual reproduction with some hermaphrodites• No cell wall• Motile at some stage• Rapid response to environment
– Nerve cells
– Muscle cells
– Both
Taxonomy
Taxonomy
Classification• 27 Phyla – discuss major ones • Grouped as:
– Invertebrates: NO backbone/vertebral column– Vertebrates: backbone/vertebral column– What is a backbone and what is a chordate?
• Backbone: supportative bone structure• Chordate: has nerve chord
• We will cover:– 6 phyla
• 5 invertebrate phyla• 8 classes within the chordate phyla
Classification
Domain Kingdom PhylumEukarya Animalia Sponges
CnidariansFlatwormsRoundworms
Segmented worms
Molluscs Arthropods Echinoderms Chordates
Classification: Invertebrate(no backbone)
Domain Kingdom PhylumEukarya Animalia Sponges
CnidariansFlatwormsRoundworms
Segmented worms
Molluscs Arthropods Echinoderms Chordates
Classification
Domain Kingdom PhylumEukarya Animalia Sponges
CnidariansFlatwormsRoundworms
Segmented worms
Molluscs Arthropods Echinoderms Chordates
Sponges
(b)
• Sac-like body • Cellular level of
organization• 2 cell layers• Filter feeder• Rudimentary nervous
system• CAN regenerate
Sponges(Porifera)
Includes all types of sponges.
Essential life functions are performed at the level of cells
Water flows through sponge serving as respiratory, excretory, and internal transport system at same timeBudding serves as asexual reproduction.
Classification
Domain Kingdom PhylumEukarya Animalia Sponges
CnidariansFlatwormsRoundworms
Segmented worms
Molluscs Arthropods Echinoderms Chordates
Cnidaria (Coelenterata)
• Marine
• Radial symmetry
• Two cell layers with differentiation; one body opening
• Alternating body forms (polyp & medusa)
• Stinging cells
Cnidaria Examples
Includes jellyfish, sea anemones, hydras and coral.
Soft-bodied animals with stinging tentacles arranged in circles around their mouth.
Life cycles contain sessile flowerlike polyp and the motile bell-shaped medusa
Lack centralized nervous system and general brain.
Classification
Domain Kingdom PhylumEukarya Animalia Sponges
CnidariansFlatwormsRoundworms
Segmented worms
Molluscs Arthropods Echinoderms Chordates
Flatworms (Platyhelminthes)
• 3 cell layers
• Acoelomate
• Many parasitic and/or pathogenic
• One way digestive system
Includes flatworms, flukes, and planarians.
Simplest animals with bilateral symmetry.
Perform life functions at the level of organ systems.
Aquatic and free living parasites.
Lack usual circulatory and respiratory systems.
Classification
Domain Kingdom PhylumEukarya Animalia Sponges
CnidariansFlatwormsRoundworms
Segmented worms
Molluscs Arthropods Echinoderms Chordates
Roundworms (Nematoda)
• Moist environments
• Most free-living; many parasitic
• Pseudocoelomate
• Tube-like digestive system
• Well-developed senses in free-living
Includes all roundworms.
Simplest animals to have a digestive system with two openings-mouth and anus.
Most numerous of all multicellular animals.
Free living-found in virtually all parts of the Earth.
Have simple nervous systems and reproduce sexually.
Classification
Domain Kingdom PhylumEukarya Animalia Sponges
CnidariansFlatwormsRoundworms
Segmented worms
Molluscs Arthropods Echinoderms Chordates
Annelids• Segmented
• Coelomate
• Hydrostatic skeleton
• Brain + solid nerve cord
• Three main types– Marine Worms
• 1 Clam worms (predators)
• 2 Fan worms (prey)
– Earthworms– Leeches
Annelids
Includes sandworms and bloodworms.
Characterized by paired paddlelike appendages on body segments.
Appendages are tipped with bristles that give this class its name.
Live in cracks in coral reefs, sand, mud, piles of rocks, and open water.
Classification
Domain Kingdom PhylumEukarya Animalia Sponges
CnidariansFlatwormsRoundworms
Segmented worms
Mollusks Arthropods Echinoderms Chordates
Molluscs (Mollusca)
• Soft bodied with protective shells
• Aquatic/Marine
• Often mucus feeders
• Body parts– Visceral mass– Foot– Mantle (secretes shell)
Includes clams, mussels, squids, octopi, slugs, and snails.
Soft-bodied animals with external or internal shell.
Body consists of: foot, mantle, shell,+ visceral mass.Utilizes both open and closed circulatory systems.
Use nephridia to remove ammonia from blood.
Mollusks
Class including slugs and snails.
Move by means of large foot on ventral side.
Most have one-piece shell for protection.
Defenses from predators include: bad-taste, poison, stinging, nocturnality, and quickness.
Bright colors are warnings of danger.
Class includes squids and octopi, cuttlefish, and nautiluses.Eight flexible tentacles are equipped suction cups for grabbing fish.
Lack protective shell but have developed form of jet propulsion for defense.
Able to squirt dark, foul-tasting ink into water and octopi can change colors to those of its surroundings.
Classification
Domain Kingdom PhylumEukarya Animalia Sponges
CnidariansFlatwormsRoundworms
Segmented worms
Molluscs Arthropods Echinoderms Chordates
Arthropods• 3 types:
– 1 Crustaceans
– 2 Insects
– 3 Arachnids
• Major characteristics:– 1 Exoskeleton (chitin)
• Protection
• Attachment for muscles
• Movement
• Prevent drying out
– 2 Segmented bodies Head, thorax, abdomen, w/ jointed appendages
– 3 Well developed brains and nervous systems
Arthropods: Crustaceans
Arthropods: Insects
Arthropods: Arachnids
Classification
Domain Kingdom PhylumEukarya Animalia Sponges
CnidariansFlatwormsRoundworms
Segmented worms
Molluscs Arthropods Echinoderms Chordates
Echinoderms
• Marine animals
• Internal skeleton
• Spiny skin
• Radially symmetrical
Echinoderms
Classification
Domain Kingdom Phylum
Eukarya Animalia Sponges
Segmented worms
Molluscs
Arthropods
Echinoderms
Chordates
Phylum Chordata
Chordates have during some time in their development:
• 1 notochord
• 2 hollow nerve cord in the back
• 3 pharyngeal pouches (embryonic structures)
• 4 tail
ClassificationDomain Kingdom Phylum ClassEukarya Animalia Sponges
Segmented worms Molluscs Arthropods Echinoderms Chordates Lancets
TunicatesJawless FishCartilaginous
FishBony FishAmphibiansReptilesBirdsMammals
Lancets (invertebrate)
Tunicates (invertebrate)
ClassificationDomain Kingdom Phylum ClassEukarya Animalia Sponges
Segmented worms Molluscs Arthropods Echinoderms Chordates Lancets
TunicatesJawless FishCartilaginous
FishVertebrates Bony Fish
AmphibiansReptilesBirdsMammals
Vertebrates• 1 living internal skeleton
• 2 closed circulation
• 3 paired appendages
• 4 efficient breathing and excretion
• 5 highly developed brains
Jawless Fishes-Agnatha (lampreys)
Cartilaginous Fishes-Chondrichthyes
• 3 Types – Sharks
– Rays
– Skates
• 3 Well developed senses– electrical
– pressure
– smell
Bony Fishes-Osteichthyes• Claim to fame: (most numerous
vertebrate)• 3 Types
– Perch– Trout– Salmon
• 3 Traits– Bony skeleton– Scales– Jaws
Amphibia• 4 types
– Frogs
– Toads
– Newts
– Salamanders
• 3 traits– Usually 4 legs
– Usually metamorphose
– Smooth, moist skin
Amphibian Metamorphosis
Reptilia• 4 types:
– Turtles
– Alligators
– Snakes
– Lizards
• 3 traits– Usually 4 legs
– Egg with a shell
– Dry, scaly skin
Aves• Traits:
– Feathers
– Hard-shelled egg
– Usually wings for flying
• Classification– Beak type
– Foot type
Birds• Adaptations for flying
– Wings
– Hollow, light bones
– Feathers
– Sternum
– Well-developed heart
– Well-developed lungs
Mammalia
• 4 traits– Mammary glands
– Body hair
– Warm-blooded
– Infant dependency
• 3 types:– 1 Monotremes
– 2 Marsupials
– 3 Placental
Mammals: Monotremes
• 2 types– 1 spiny anteater
– 2 duckbilled platypus
• Reproduction:– Eggs
Mammals: Marsupials• Location: Australia, • 4 types:
– 1 opossum (here)– 2 koala– 3 kangaroo– 4 Tasmanian wolf
• Reproduction:– Born very early– Crawl into a pouch– Attach to a mammary
gland
Mammals: Placental Mammals
Order: Primates
• Traits:– 1 opposable thumb
– 2 learned behavior
– 3 big brain
• Family: Hominidae• Genus: Homo• Species: Homo sapiens
Ardipithecusramidus
Australopithecusafarensis
H. heidel-bergensis
A. boisei
A. africanus
A. robustus
H.habilis
H.sapiens
H. erectus
Homo ergaster
H. neanderthalensis
Hominids
Neanderthals vs. Cro-Magnons
New member of Homo genus repo
• Homo florensiensis• Small island in Indonesia:
Florens• Short stature• Grapefruit sized skull• Island evolution
– Isolation– Inbreeding– Reduced resources– Limited competition– Get smaller
• Co-existed with modern humans until 18,000 years ago.
http://www.nature.com/news/specials/flores/index.html
Who are you?• Domain: Eukarya Eukaryote
• Kingdom: Animalia Animal
• Phylum: Chordata Chordate
• Class: Mammalia Mammal
• Order: Primata Primate
• Family: Hominidae Hominid
• Genus: Homo Human
• Species: sapiens modern