BIOLOGY. An Introduction to Invertebrates CAMPBELL. Reece Urry Cain Wasserman Minorsky Jackson
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1 CAMPBELL BIOLOGY TENTH EDITION Reece Urry Cain Wasserman Minorsky Jackson 33 An Introduction to Invertebrates Lecture Presentation by Nicole Tunbridge and Kathleen Fitzpatrick
2 Figure 33.UN08 Metazoa Eumetazoa Bilateria Lophotrochozoa Ecdysozoa Deuterostomia Phylum Porifera (sponges) Cnidaria (hydras, jellies, sea anemones, corals) Platyhelminthes (flatworms) Rotifera (rotifers) Lophophorates: Ectoprocta, Brachiopoda Mollusca (clams, snails, squids) Annelida (segmented worms) Nematoda (roundworms) Description Lack true tissues; have choanocytes (collar cells flagellated cells that ingest bacteria and tiny food particles) Unique stinging structures (nematocytes) housed in specialized cells (cnidocytes); diploblastic; radially symmetrical; gastrovascular cavity (digestive compartment with a single opening) Dorsoventrally flattened acoelomates; gastrovascular cavity or no digestive tract Pseudocoelomates with alimentary canal (digestive tube with mouth and anus); jaws (trophi); head with ciliated crown Coelomates with lophophores (feeding structures bearing ciliated tentacles) Coelomates with three main body parts (muscular foot, visceral mass, mantle); coelom reduced; most have hard shell made of calcium carbonate Coelomates with segmented body wall and internal organs (except digestive tract, which is unsegmented) Cylindrical pseudocoelomates with tapered ends; no circulatory system; undergo ecdysis Arthropoda (spiders, centipedes, crustaceans, and insects) Coelomates with segmented body, jointed appendages, and exoskeleton made of protein and chitin Echinodermata (sea stars, sea urchins) Chordata (lancelets, tunicates, vertebrates) Coelomates with bilaterally symmetrical larvae and five-part body organization as adults; unique water vascular system; endoskeleton Coelomates with notochord; dorsal, hollow nerve cord; pharyngeal slits; post-anal tail (see Chapter 34)
3 Figure 33.UN08a Phylum Porifera (sponges) Cnidaria (hydras, jellies, sea anemones, corals) Description Lack true tissues; have choanocytes (collar cells flagellated cells that ingest bacteria and tiny food particles) Unique stinging structures (nematocytes) housed in specialized cells (cnidocytes); diploblastic; radially symmetrical; gastrovascular cavity (digestive compartment with a single opening)
4 Concept 33.1: Sponges are basal animals that lack true tissues Animals in the phylum Porifera are known informally as sponges (sedentary and live in marine waters or fresh water) mesohyl
5 Choanocytes, flagellated collar cells, generate a water current through the sponge and ingest suspended food Sponges consist of a gelatinous noncellular mesohyl layer between two cell layers Amoebocytes are found in the mesohyl and play roles in digestion and structure Most sponges are hermaphrodites: Each individual functions as both male and female
6 Concept 33.2: Cnidarians are an ancient phylum of eumetazoans All animals except sponges and a few other groups belong to the clade Eumetazoa, animals with true tissues Phylum Cnidaria is one of the oldest groups in this clade
7 Figure 33.5 diploblastic, radial body plan 1) Polyp sessile Mouth/anus Tentacle Gastrovascular cavity 2) Medusa motile Gastrodermis Body stalk Mesoglea Epidermis Tentacle Mouth/anus
8 Cnidarians have diversified into a wide range of both sessile and motile forms including jellies, corals, and hydras They exhibit a relatively simple diploblastic, radial body plan - basic body plan of a cnidarian is a sac with a central digestive compartment, the gastrovascular cavity A single opening functions as mouth and anus There are two variations on the body plan: the sessile polyp and motile medusa A polyp adheres to the substrate by the aboral end of its body A medusa has a bell-shaped body with its mouth on the underside. Medusae do not attach to the substrate but move freely
9 Video: Hydra Eating Daphnia (Time Lapse)
10 Cnidarians are carnivores that use tentacles to capture prey The tentacles are armed with cnidocytes, unique cells that function in defense and capture of prey Nematocysts are specialized organelles within cnidocytes that eject a stinging thread
11 Cnidarians are carnivores that use tentacles to capture prey The tentacles are armed with cnidocytes, unique cells that function in defense and capture of prey Nematocysts are specialized organelles within cnidocytes that eject a stinging thread
12 Phylum Cnidaria diverged into two major clades, Medusozoa and Anthozoa, early in its evolutionary history Scyphozoans (jellies) Cubozoans (box jellies) Hydrozoans Anthozoans occur only as polyps
13 Anthozoans The clade Anthozoa includes the corals and sea anemones Corals often form symbioses with algae and secrete a hard exoskeleton (external skeleton) Each generation grows on the skeletal remains of the previous generation, forming rocks that provide habitat for other species Coral reefs rainforests of the sea
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