Studied by 2 people
Animals
Multicellular
Eukaryotic
Heterotrophic
Two types of tissues that are only found in animals:
Nervous system tissue
Muscle tissue
Most reproduce sexually
Most are mobile
Classifying Animals
Since animals share so many common characteristics, we classify them based on other homologies (similar traits)
Animals are characterized based on body plan (the layout of their body structures)
Symmetry
Organization of body tissues
Other physiological modifications of body parts
Bilateral vs Radial Symmetry
Radial is symmetrical along any plane through central axis wheres as Bilateral is single line of symmetry with left/right sides
Chordata (vertebrates) Include:
jawless fish ex lamprey, Cartilaginous fish ex. Shark and bony fish ex tuna
Vertebrates
Backbone supports a delicate central nerve cord and anterior brain
Internal Skeleton
Can grow bigger than arthropods
Can move in more complex ways
Anterior skull contains and protects brain
Extends past the anus to tail
Internal Skeleton (2)
Gills (aquatic) or lungs (terrestrial)
Ventral heart
Closed circulatory system
Cell specialization germ layers
Germ Layers – layers of cells in a developing embryo that give rise to specialized tissues
Ectoderm
Mesoderm
Endoderm
Coelom – body cavity
Present in some animals
Contains the organs Develops from mesoderm
examples
sea stars, sea urchins, earthworms, sponges, jellyfish, lobsters, crabs, insects, spiders, snails, clams, and squid.J
Classes Chordata
Craniata (fish, amphibians, reptiles, birds, and mammals); Tunicata or Urochordata (sea squirts, salps); and Cephalochordata (which includes lancelets).
Phylum Chordata
fish, amphibians, reptiles, birds, and mammals.
