9 major animal phyla - weeblymrvolkmann.weebly.com/uploads/8/8/9/7/8897773/9_major_animal_ph… ·...
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9 Major Animal Phyla
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Placozoa
* Porifera (sponges)
* Cnidaria (jellyfish, corals, anenomes)
Ctenophora (comb jellies)
Mesozoa (worm-like)
* Platyhelminthes (flatworms)
Nemertina (ribbon worms)
Gnathostomulida (marine worms)
Gastrotricha (worm-like)
Rotifera
Kinorhyncha (worm-like)
Loricifera
Acanthocephala (spiny-headed worms)
Entoprocta
* Nematoda (roundworms)
Nematomorpha (horsehair worms)
Ectoprocta
Phoronida
Brachiopoda
* Mollusca (bivalves, squid)
Priapulida (marine worms)
Sipuncula (peanut worms)
Echiura (spoon worms)
* Annelida (segmented worms)
Tardigrada
Pentastoma (tongue worms)
Onychophora (velvet worms)
* Arthropoda (arachnids, crustaceans, insects)
Pogonophora (beard worms)
* Echinodermata (starfish, urchins)
Chaetognatha (arrow worms)
Hemichordata
* Chordata (some invertebrates, fish, amphibians, reptiles, birds, mammals)
The 33(?) Phyla of the Animal
Kingdom
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Phylum Porifera
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• all aquatic – mostly marine, some freshwater
• sessile
• asymmetrical
• no true tissues (no mouth, no digestive cavity, no muscles, no nervous system)
• epithelial, collar, and amoeboid cells
• asexual and sexual reproducers
• most are hermaphrodites
• food and shelter for many organisms
• endoskeleton – spicules of CaCO3 or silica
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Phylum Cnidaria
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• radial symmetry
• two layers of tissue – endoderm and ectoderm with a jellylike mesoglea layer inbetween
• specialized nerve, muscle, digestive, and reproductive tissue
• tentacles with nematocysts
• many species considered at risk
• most have 2 life cycle stages – polyp (asexual) and medusa (sexual)
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Phylum Platyhelminthes
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• flattened
• unsegmented
• bilateral symmetry
• hydrostatic skeleton
• three cell layers
• 3 cell layers but acoelomates
• no circulatory or respiratory systems
• degree of cephalization
• mainly parasites
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Phylum Nematoda
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• roundworms
• soil and aquatic
• unsegmented
• deparate mouth and anus
• 3 cell layers but pseudocoelomates
• no circulatory or respiratory systems
• hydrostatic skeleton
• scavengers, parasites
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Phylum Annelida
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• segmented
• terrestrial, marine, freshwater
• 3 cell layers; coelomates
• grow larger than non-segmented worms
• hydrostatic skeleton
• bilateral symmetry
• complete digestive and circulatory system
• some are hermaphrodites
• some have parapodia and/or setae
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Phylum Mollusca
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• most are marine and live freely
• some swim, some creep slowly, some are terrestrial
• body plan contains a foot (muscular, used for motion), mantle (covers gills and secretes shell), and visceral mass (contains organs)
• varying degrees of cephalization
• bilateral symmetry
• 3 cell layers; coelomates
• radula used for scraping and boring
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Phylum Echinodermata
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• spiny-skinned
• larvae are bilaterally symmetrical, adults are radial
• digestive and circulatory systems, but no respiratory or excretory systems
• endoskeleton
• 3 cell layers, coelomates
• sexual reproduction
• move using ‘hydraulics’
• no head no cephalization
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Watch me walk
Watch me eat
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Phylum Arthropoda
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• dominate numbers of individuals and numbers of species; variable shapes and sizes
• segmented body with jointed appendages
• complex sensory systems, some with antennae
• aquatic and terrestrial
• digestive, excretory, and (open) circulatory systems
• 3 cell layers; reduced coelom
• exoskeleton moulting