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Phylum Characteristics

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wucoceyu's version from 2016-12-02 20:13

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Poriferasponges are sessile, have only few different types of cells, no nervous system, flagellated, if broken apart, can form new sponges, saclike structure, cells lining cavity capture food
Cnidaria(hydra, sea anemone, jellies) Radial symmetry, tentacles around simple gut opening, gut has 1 opening; food and waste pass, have endoderm and ectoderm, no respiratory or circulatory system, simple nerve net to respond, nematocysts: have toxins to capture prey, sexual and asexual reproduction
Platyhelminthyes(flatworms) bilateral symmetry, all 3 layers, no circulatory or respiratory system, simple light detecting nervous system, digestive system is cavity with single opening, no coelom (body cavity between intestinal canal and the body wall), use cilia to move
Nematoda(roundworms), 3 cell layers, complete digestive tract w/ 2 openings, mouth & anus, body cavity called pseudocoelom around gut, movement (wiggling) no circulatory & respiratory system (direct gas exchange)
Annelida(segmented worms), coelom body cavity, hydrostatic skeleton, movement thru nervous system, Each segment is controlled by ganglion of nerves and has a twin set of excretory organs called nephridia, direct gas exchange via skin, closed circulatory system w/ 5 pairs of hearts
Arthropoda(insects, crustaceans, arachnids). joint appendages, chitin exoskeletons that prevent gas exchange thru skin, evolved respiratory system, book lungs, complex nervous system, sensory organs, compound eyes, open circulatory system, coelom less important to movement, 1st winged organisms on earth & now most abundant and varied
Echinodermata(sea stars, and urchins), radial symmetry, spiny, water vascular system (network of vessels that carry H2O to tube feet- small sucker like extensions) capacity for regeneration, have chordates, tube feet allow them to adhere to surfaces, hard internal skeletons- helps them w' protection and moving
Mollusca(calms, squid, snail), muscular foot, mantle that secretes hard protective shell, rasping tongue called radula, use gills for respiration, feeding and moving (with cilia)
Chordatastiff, sold dorsal rod called notochord, paired gill slits dorsal hollow nerve cords, tails that extend beyond anus, ventral heart, these adaptations paved the way for evolution of vertebrates
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