domain eukarya kingdom animalia -...
TRANSCRIPT
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Domain Eukarya
Kingdom Animalia
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Marine members include jellyfishes, sea anemones, corals, and hydroids.
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Cnidaria and Ctenophora exhibit radial symmetry
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Relatively simple, diffuse nerve net
lacks a central brain to process sensory info. or to organize complex responses
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Different degrees of centralization in metazoan brains.
Arendt D et al. Phil. Trans. R. Soc. B 2008;363:1523-1528
©2008 by The Royal Society
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Mouth is located at the center of the body on the oral side.
The opposite side is the aboral side
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Box
Jellyfish
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Uncharacteristically advanced Cnidarian. Primitive eyes (eyespots) are present. When they detect a dark spot, they go the other way.
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The body may be either vase-shaped (polyp) or bell-shaped (medusa)
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Polyp is sessile and benthic. ◦Tentacles and mouth face upward
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Medusa is free-swimming ◦Tentacles and mouth face downward
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All cnidarians have bodies constructed of two layers ◦Epidermis is outer layer
◦Gastrodermis is inner layer
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A. gastrovascular cavity
B. gastrodermis
C. mesoglea
D. nematocysts
E. epidermis (integument)
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Diploblasty is a condition of the blastula in which there are two primary germ layers: the ectoderm and endoderm.
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Between the layers is a jellylike mesoglea
A centrally located mouth leads to a baglike digestive tract- the gastrovascular cavity
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Tentacles that surround the mouth are covered with specialized cells- cnidocytes
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Cnidocytes produce organelles called nematocysts
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Nematocysts are stinging organelles that exit the cnidocyte (cnidoblast) with great force once triggered
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The nematocyst capsule stores a large concentration of calcium ions, which are released from the capsule into the cytoplasm of the cnidocyte when the trigger is activated. This causes a large concentration gradient of calcium across the cnidocyte plasma membrane. The resulting osmotic pressure causes a rapid influx of water into the cell. This increase in water volume in the cytoplasm forces the coiled nematocyst to eject rapidly.
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Some nematocysts are adhesive, others have filaments to entangle prey, and others have spines that puncture prey.
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1.Tentacles capture prey
2.Cnidocytes release nematocysts into prey, paralizing it.
3.Tentacles push prey into mouth
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4.Enzymes in gastrovascular cavity break up prey
5.Gastrodermis cells absorb nutrients
6.Waste exits mouth
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Four classes
◦Hydrozoa
◦Scyphozoa
◦Cubozoa
◦Anthozoa
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3700 species
Most live as colonial organisms
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Many polyps attached to branched stalks
Some polyps function in gathering food; others are responsible for reproduction
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Portuguese man-of-war
Exists as a colony of medusea and polyps
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Pneumatophore- a single individual polyp (gas-filled float)
Dactylozooids- (tentacles) polyps specialized for capturing prey
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Gastrozooids- polyps specialized for digestion Gonozooids- polyps specialized for reproduction
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“Cup Animals” Medusa is dominant form of life cycle Commonly known as jellyfish
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largest (Cyanea capillata, or lion’s mane), which has a bell that measures 6 feet across
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Pulsating motion of the cup propels the jellyfish Common jellyfish have life cycle that includes both medusa and polyp
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Common jellyfish reproduction
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Box Jellies
Most advanced and deadly
eyespot
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(Irukandji, Carukia barnesi) which is the size of your fingernail.
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“Flower Animals”
~6100 Species
Examples include Sea anemones and corals
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Sea anemones are benthic polyps ◦Commonly found in coastal areas ◦Feed on fishes and other small animals
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Symbiotic relationship with clownfish.
Corals are small polyps that usually live in colonies.
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◦Each polyp cements its calcium carbonate skeleton to the skeletons of others
◦Live symbiotically with algae
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“Comb holder”- comb jellies
~100 species
Move by beating cilia (ctenes) lined along body
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Secrete sticky substance from colloblasts. ◦Some have cnidocytes they recycle from eating cnidarians
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Two tentacles Bioluminescent
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