kingdom animalia. important phyla features 1) evolution of tissues –present in all but one group...
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Kingdom Animalia
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Important phyla features• 1) Evolution of tissues
– Present in all but one group (Phylum Porifera: sponges)
– Called ________________.– Animals with tissues (all other phyla) called
Eumetazoa.
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Important phyla features• 2) Evolution of symmetry
– Sponges lack definite _______________– Radial symmetry: characterize Radiata (Phyla
Cnidaria and Ctenophora)
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Important phyla features• 2) Evolution of bilateral symmetry
• Other animal phyla have bilateral symmetry
• Note dorsal/ventral, anterior/posterior
• Note _____________: clustering of senses and nervous system at one end of body
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Important phyla features• 3) Evolution of a body cavity
• Acoelomates: no ______________. Outside from ectoderm, gut from endoderm, in-between from mesoderm
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Important phyla features• 3) Evolution of a body cavity
• Pseudocoelomates: body cavity between mesoderm and ________________
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Important phyla features• 3) Evolution of a body cavity
• Coelomates: body cavity (coelom) develops within mesoderm. Organs suspended in it. ____________: epithelium cells lining coelom
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Important phyla features• 3) Evolution of a body cavity
• Problem: cavity needs circulation system (blood)
• Open system: blood dumped into _________ and mixes with body fluids
• Closed system: blood kept within ___________
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Important phyla features• 4) Protostome vs. deuterostome development
• Paths of embryonic development: does _________ become mouth or anus?
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Important phyla features• 4) Protostome vs.
deuterostome development
• Other: cleavage pattern, ____________ formation
• Also: any cell in deuterostome embryo can develop into complete organism, but not protostome
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Important phyla features• 5) Segmentation
• Divide body into sections along its length– allows ______________ of systems (damage to
one not fatal)– allows greater movement complexity as ________
expand/contract/interact
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Phylogeny of animals• Uncertain
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Subkingdoms• 1) Parazoa: Lack symmetry, lack ____________
– Phylum Porifera (sponges)
• 2) Eumetazoa: Have definite shape and symmetry. Have tissues, and usually these organized into organs (groups of tissues with specific structure and function)– Radiata: Have 2 embryonic layers. Ectoderm (outer)
and endoderm (inner). ___________________.– Bilateria: Have 3 embryonic layers: Ectoderm,
endoderm, and mesoderm (middle layer). _____________.
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Phylum SurveyPhylum Porifera (sponges)
Phylum Cnidaria (cnidarians)
Phylum Platyhelminthes (flatworms)
Phylum Nematoda (roundworms)
Covered in Lab 6
Sea anemone (Cnidaria)with symbiotic fish
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Phylum Porifera• Parazoa: Lack symmetry, lack _____________
• About 5000 species, almost all marine
• Larva (immature stage) swims, adult is sessile (attached to ocean bottom)
• Have multiple cell types, but little ___________ among cells
“Glass” sponges from 1400 feet down
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Phylum Porifera• Osculum: large opening
• Water flows thru pores, driven by __________ of choanocytes
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Phylum Porifera• Collar of choanocytes traps food particles
(ingested by cell)
• Digestion __________________
• Spicules (hard) and spongin (spongy) fibers
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Phylum Porifera• Spicules and spongin fibers
(protein): give body shape and protection
Spicules
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Phylum Porifera• Other cells:
– epithelium– pore– amoebocyte (move about and secrete spicules and
spongin fibers)
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Phylum Porifera• Other cells obtain food by transfer from
_______________
• Note spongocoel: large internal cavity. NOT a true digestive cavity since digestion intracellular.
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Phylum Porifera• Body complexity
– 1) simple (Scypha)– 2) intermediate– 3) complex (common)– Note spongocoel and where
choanocytes located in each type.
Scypha sponges
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Phylum Porifera• Reproduction:
• Asexual by _____________. Can pass some sponges through silk mesh and they’ll reform!
• Sexual: some _____________ make sperms and eggs, these then make swimming larva
• Larva settles and starts to grow into mature sponge.
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Phylum Porifera• Sponge importance/uses:
• Original source of ________ sponges
Greek sponge fishermenand processors (MediterraneanSea)
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Phylum Porifera• Sponge importance/uses:
• Consumers/habitat feature in marine _________
• Some contain potentially useful chemicals– some toxic to fish and used as insecticides– HIV treatment? One sponge chemical interferes with
HIV virus– Cancer treatment? ______________: compounds
that inhibit tumor growth
Sponge inhabitedby crab
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Phylum Cnidaria (cnidarians)• Subkingdom Eumetazoa: have tissues
• Embryos with ectoderm (becomes epidermis tissue and nerves) and endoderm (becomes digestive tissue: gastrodermis). _____________.
• Note no mesoderm.
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Phylum Cnidaria (cnidarians)• Have mouth and digestive (gastrovascular)
cavity. Extracellular digestion (can eat big things!). Incomplete digestive tract (no anus).
• ____________ is tissue (produced by ectoderm) between epidermis and gastrodermis that contains muscles
• Member of Radiata: have radial symmetry, lack organs
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Phylum Cnidaria (cnidarians)• Almost all marine. About _________ species.
• Carnivores. Capture prey with stinging tentacles.
QuickTime™ and aCinepak decompressorare needed to see this picture.
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Phylum Cnidaria (cnidarians)• Body forms: polyp (sessile) and medusa
(swimming)
• Each with gastrodermis, epidermis, mesoglea
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Phylum Cnidaria (cnidarians)• Many have polyps and medusae as parts of life
cycle
• Make swimming planula larva
• Example: Obelia
• Note asexual reproduction of polyps by _________
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Phylum Cnidaria (cnidarians)• Body structure of polyp (Ex, Hydra)
• Note digestion is extracellular (outside of individual cells) in gut cavity. Individual cells ingest food particles by ________________.
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Phylum Cnidaria (cnidarians)• Tentacles with stinging cells (cnidocytes).
• Cnidocytes contain ______________ (harpoon)
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Class Hydrozoa (hydroids)• Usually with polyp and medusa stages
• Exs, Obelia (marine), Hydra (freshwater)
• Bottom view of medusa of Obelia, with _____________, mouth visible.
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Class Hydrozoa (hydroids)• Ex, Portuguese man-of-war
• Colony of four types of polyps– float polyp– feeding polyps– tentacle polyps– gamete polyps
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Class Scyphozoa (jellyfish)• Only about 200 species, _____________
• Medusa stage largest part of life cycle
QuickTime™ and aCinepak decompressorare needed to see this picture.
Swim using contractions of bell
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Class Scyphozoa (jellyfish)• Anatomy
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Class Cubozoa (box jellyfish)• Similar to jellyfish, but tentacles at end of box-
shaped body
• Small group: 20 species.
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Class Cubozoa (box jellyfish)• Can be deadly. Ex, Australian
stinger.
• Nematocysts packed into rings on tentacles.
• 100 deaths in last century due to extensive stings
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Class Anthozoa (sea anemones/corals)• Largest cnidarian group (6200 species), marine
• Sea anemones:– Have only _________ stage. – Solitary (don’t form colony). – Make no exoskeleton.
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Class Anthozoa (sea anemones/corals)• Body a tube: oral disk (with mouth) surrounded by
tentacles, pedal disk attaches tube to bottom
• Pharynx and gastrovascular cavity process ______.
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Class Anthozoa (sea anemones/corals)• Sea anemone symbionts
– anemonefishes (28 species): not stung (due to ______ on fish body). Can be species-specific.
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Class Anthozoa (sea anemones/corals)• Sea anemone symbionts
– some have algae living in tissues (zooxanthellae)– can give anemone color– deep sea anemones lack these.
A deep sea anemoneThe submersible,Alvin
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Class Anthozoa (sea anemones /corals)• Corals:
– Also have only polyp stage but are _____________.– Many secrete exoskeleton of calcium carbonate (stony
corals).
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Class Anthozoa (sea anemones/corals)• Corals: Help form coral reefs.
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Class Anthozoa (sea anemones/corals)• Stony corals: Have exoskeletons, and many
tentacles per polyp.
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Class Anthozoa (sea anemones/corals)• Soft corals: Do not have exoskeletons. Have
only ______ tentacles per polyp.
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Class Anthozoa (sea anemones/corals)• _________ examples include gorgonians,
leather corals, and sea pens Leather corals (3 ft tall)
Gorgonians
Seapens
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Coral Reefs• Diverse: maybe 1-3
million species present• 30% of ocean fish
species, ______% of ocean area
• High productivity• Marine “__________”:
many fish spend some time (including larval stages) at reefs.
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Coral Reefs• Recall coral biology: polyps contain
photosynthetic dinoflagellate algae (zooxanthellae)
• Algae produce up to ______% of energy used by polyp.
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Coral Reefs• Unusually warm
water may cause corals to expel _________________
• “Bleached” coral may die
• 1998 El Niño Event: warm water widespread in Tropics.
A bleaching coral from Micronesia
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Coral Reefs• 1998 El Niño event
– Indian Ocean: up to 85% coral mortality– Great Barrier Reef (Australia): 87% of inshore
reefs bleached– Florida Keys: 40-90% of reefs bleached.
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Coral Reefs
• Many other threats:– Global climate change– Pollution– Sedimentation– Overharvesting– Blasting (dynamiting):
fishing technique
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Coral Reefs• Many other threats:
– ________ fishing: capture fish for aquarium trade or for live food fish in oriental markets
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Coral Reefs• 2002 report (Status of The Coral Reefs of
the World 2002)– 27% of reefs already severely
damaged/destroyed– 14% more expected to be severely
damaged/destroyed in next 10-20 years
• August 2003 article (in journal: Science)– 30% of coral reefs severely damaged– 60% projected severely damaged by 2030.
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Phylum Ctenophora (comb jellies)• Subkingdom Eumetazoa: have ____________
• Embryos with ectoderm, endoderm. Have epidermis, gastrodermis, mesoglea.
• Member of Radiata: have radial symmetry, lack ___________
• Small group: 100 species
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Phylum Ctenophora (comb jellies)• Have mouth and anal pore (complete digestive
tract)
• Have comblike plates of __________, used to swim.
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Phylum Ctenophora (comb jellies)• Many are
________________
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Importance• Invasive species
– North American comb jelly
– About 10 cm in length
– Predatory: eats small fish and fish larvae.
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• Introduced into Black Sea in ship ballast
• Now in Caspian Sea, some in Mediterranean.
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Importance• Detected in 1982
• By 1989 was ____% of biomass in Black Sea
• Destroyed $250 million/yr fishery there.
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Phylum SurveyPhylum Porifera (sponges)
Phylum Cnidaria (cnidarians)
Phylum Platyhelminthes (flatworms)
Phylum Nematoda (roundworms)
Covered in Lab 6
Sea anemone (Cnidaria)with symbiotic fish
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Eumetazoa: Bilaterian Acoelomates• Bilateral symmetry
• Acoelomates: no ___________, but 3 embryonic layers (ectoderm, endoderm, mesoderm)
• Focus on Phylum Platyhelminthes (flatworms)
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Phylum Platyhelminthes (flatworms)• 20,000 species. Most (75%) are
parasites. Others aquatic or soil terrestrial habitats
Marine flatworm
Planaria
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Phylum Platyhelminthes (flatworms)• Body solid: only cavity is __________
• Gut is incomplete (1 opening). Digestion mainly _________________.
• Have head, organs. Pharynx: acts as mouth and anus
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Phylum Platyhelminthes (flatworms)• Have __________ system (protonephridia,
containing flame cells)
• Control water content, excrete wastes thru excretory pore
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Phylum Platyhelminthes (flatworms)• Lack __________ system. All cells must
be close to gut or epidermis to receive oxygen and food (gut highly branched to aid this)
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Phylum Platyhelminthes (flatworms)• ______________ (hermaphroditic): make both
eggs (in ovaries) and sperm (in testes).