Phylum
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| 5000 species | Porifera
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| Asymmetric bodies and lack distinct tissues, often classified from other animals | Porifera
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| Immobile except in early stages | Porifera
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| Collect food particles by sweeping flagellated cells | Porifera
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| Flagellated cells | Choanocytes
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| 10,000 species | Cnidaria
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| Also Called coelenterate | Cnidaria
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| Develop from two layered embryo and have two separate tissue layers and radial symmetry | Cnidaria
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| Diploblastic | two-layered
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| Two live stages, mobile usually medusa and the sessile polyp | Cnidaria
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| Nematocysts | Stinging cells
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| Hydras, Sea anemones, Corals, Jellyfish, portugese man o war | Cnidaria
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| 15, 000 species | Platyhelminthes and Nematoda
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| Flatworms are most primitive phylum to develop this | Triploblastic (3 layered embryo).
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| Bilateral body symmetry, and are acoelomate (lack body cavity) | Platyhelminthes
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| Space between digestive tract and body wall is filled with tissue | Platyhelminthes
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| Have true head and brain, but digestive system has one opening that functions as both mouth and anus | Platyhelmintheez
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| Most are flatworms and hermaphroditic | Platyhelminthees
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| Parasites like tapeworms, flukes, and free living organism like planarians | Platyhelmintheez
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| Roundworms | Nematoda
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| Unsugmented worms that live in many habitats | Nematoda
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| Pseudocoelomate | Nematoda
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| 3 tissue layers that are concentric, but the body cavity is not lined with tissue from the mesoderm | Nematoda
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| Mesoderm | middle embryonic layer
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| Like platyhelmintheez are parasitic and freeliving | Nematoda
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| Hookworms and things that cause elephantiasis, trichinosis, and river blindness | Nematoda
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| Soil ones are pests, but others kill plant pests | Nematoda
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| The nematode species that is common subject in genetics labs - Caenorhabdis elegans |
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| 11,500 species | Annelida
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| Segmented worms represent first lineage of truly eucoelomate animals | Annelida
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| Eucoelomate | having a body cavity lined with mesoderm tissue)
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| Body cavities are lined with tissue derived from embryonic mesoderm | Annelida
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| Polychareta and terrestrial Oligochaeta classes and leeches | Annelida
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| Earthworms | Annelida
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| Have kidney structure, blood vessels, and sometimes hermphroditism | Annelids
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| 800,000 species | Arthropoda
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| Most diverse and duccessful phylum on earth with about 75% of all species | Arthropoda
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| Characterized by joited legs and a chitinous exoskeleton | Arthropoda
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| Segmented but segments are usually fused into larger body parts with special function | Arthropoda
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| Insects, centipedes, millipedes | Uniramia
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| Arachnids, sea spiders, horseshoe crabs | Chelicerata
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| Shrimps, lobsters, crabs, crayfish, barnacles, pillbugs | Crustacea
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| Trilobites (now extinct) | Trilobitomorpha
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| Only 1 specie | Cycliophora
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| Symbion Pandora | cycliophora
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| Tiny invertebrate first identified in 1995 when Danish biologist foujnd species in mouth of Norweigan lobster | Symbion Pandora
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| Closely related to marine phyla Entoprocta and Ectoprocta | Cycliophora
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| 50,000 species | Mollusca
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| Second most diverse phylum | Mollusca
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| Soft body covered by a thin mantle, with a muscular foot and an internal visceral mass | mollusca
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| Two fluid filled body cavities derived from mesodermal tissue | Mollusca
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| Small coelom and large hemocoel that functions as open circulatory system | Mollusca
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| Shell composed of calcium carbonate and protein, secreted by mantle | Mollusca
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| Gastropoda (Slug, Snail), Bivalvia (clams, oysters, scallops), Cephalopoda (nautilus, squids, octopi) | Mollusca
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| 6,500 species | Echinodermata
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| Endoskeleton composed of many ossicles of calcium magnesium carbonate | - Echinodermata
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| Water Vascular system, ring canal around esophagus, locomotion by tube feet connected by WVS | Echinodermata
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| Five fold radial symmetry | Echinodermata
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| Sea stars, sea urchins, sea lilies, sea cucumber | Echinodermata
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| Hae varying degree of bilateral symmetry | Sea cucumbers
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| True head is absent, oral and aboral are used to describe body orientations | echinodermata
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| Particle feeding through WVS, everting stomach to engulf prey, and scraping device | Echinodermata
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| Scraping device on sea urchins | Aristotle’s lantern
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| 44, 000 species | Chordata
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| Home phylum to us | Chordata
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| Sea squirts | Urochordata
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| Lancelets | Cephalochordata
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| true vertebrates and most diverse subphylum. | Vertebrata
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| Pharyngeal gill slits, notochord, post-anal tail, dorsal hollow never cord | Chordata
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| often used as a demonstration organism in biology labs | Amphioxus
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