BIOL 108 Chp 11-pt 1: Animal Diversification
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Transcript of BIOL 108 Chp 11-pt 1: Animal Diversification
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Chapter 11Chapter 11 Part 1Part 1
Animal DiversificationAnimal Diversification
BIOL BIOL 108 108 Intro to Bio Intro to Bio SciSci
Rob Rob SwatskiSwatski Assoc Prof Assoc Prof BiologyBiology
HACCHACC--YorkYork
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11·1–11·3 Animals are
just one branch of the
Eukarya domain.
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11.1 What is an animal?11.1 What is an animal?
Three Key Characteristics
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Take-Home Message 11.1
Animals are organisms that share three characteristics:
1) All of them can move during at least one stage of development.
2) All of them eat other organisms.
3) All of them are multicellular.
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11.2 Four key distinctions 11.2 Four key distinctions divide the animals.divide the animals.
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1) Does the animal have 1) Does the animal have defineddefined tissuestissues, with specialized cells?, with specialized cells?
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2) Does the animal develop with 2) Does the animal develop with radial symmetry or bilateral radial symmetry or bilateral
symmetry?symmetry?
A body structured like a pie or
A body with a left and right side, which are mirror images
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3) During development, does 3) During development, does the animal’s gut develop from the animal’s gut develop from front to back or back to front?front to back or back to front?
Protostomes
and
Deuterostomes
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4) Does growth occur by 4) Does growth occur by molting or by adding molting or by adding
continuously to the skeletal continuously to the skeletal elements? elements?
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Take-Home Message 11.2
The animals probably originated from an ancestral protist.
Four key distinctions divide the extant animals:
1) Tissue or not
2) Radial or bilateral symmetry
3) Protostome or deuterostome development
4) Growth through molting or through continuous skeletal enlargement
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11.3 Everything that is not 11.3 Everything that is not extinct is evolutionarily extinct is evolutionarily
successful.successful.
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What is “success” evolutionarily?What is “success” evolutionarily? Extant or Extinct
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Take-Home Message 11.3
From an evolutionary perspective, all extant species are successful.
However, some groups are represented by more species than others.
Among the 36 animal phyla, 9 phyla account for more than 99 percent of all described animal species.
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11.4 Invertebrates are animals without a backbone.
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11.4 11.4 Invertebrates are the largest Invertebrates are the largest and most diverse group of animals.and most diverse group of animals.
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Take-Home Message 11.4
Invertebrates, defined as animals without a backbone, are the largest and most diverse group of animals, comprising 96% of all the living species of animals.
The invertebrates are not a monophyletic group, however, and include protostomes and deuterostomes.
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11.5–11.12 Across
several evolutionary transitions, the
invertebrate animals diversified.
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11.5 Sponges are animals that 11.5 Sponges are animals that lack tissues and organs.lack tissues and organs.
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Sponge ReproductionSponge Reproduction
How do they do it?
Hermaphrodites
• Male and female sexual reproductive organs
• Free-swimming larvae become sessile adults
Asexual reproduction
• Budding
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Take-Home Message 11.5
Sponges are among the simplest of the animal lineages.
A sponge consists of a hollow tube with pores in its wall, it has no tissues or organs, and only three kinds of cells.
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11.6 Jellyfish and other cnidarians 11.6 Jellyfish and other cnidarians are among the most poisonous are among the most poisonous
animals in the world.animals in the world.
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Cnidarians Cnidarians
Two types of cnidarian bodies:
• A sessile polyp
• A free-floating medusa
Reproduce both sexually and asexually
Carnivores that use cnidocysts
• Stinging cells
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3 Major Groups of Cnidarians3 Major Groups of Cnidarians
Corals
Sea anemones
Jellyfishes
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The CoralsThe Corals
Small, soft-bodied polyps living in large colonial groups
Secrete calcium carbonate
Stinging tentacles surrounding a mouth
Sexual and asexual reproduction
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How is global warming affecting the How is global warming affecting the coral reefs of the world?coral reefs of the world?
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The Sea AnemonesThe Sea Anemones
Resemble flowers
Free-swimming larval stage
Adult stage settles
• But may crawl slowly
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The JellyfishesThe Jellyfishes
Range tremendously in size
Some species deadly
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Take-Home Message 11.6
Corals, sea anemones, and jellyfishes are radially symmetrical animals with defined tissues, in the phylum Cnidaria.
All cnidarians are carnivores and use specialized stinging cells located in their tentacles to capture prey.
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11.7 Flatworms, roundworms, and 11.7 Flatworms, roundworms, and segmented worms come in all segmented worms come in all
shapes and sizes.shapes and sizes.
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Annelids: Annelids: PolychaetesPolychaetes
Marine worms
“Many bristles”
Some are burrowing.
Some are tube dwelling.
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Annelids: EarthwormsAnnelids: Earthworms
“Few bristles”
Bulk feeders
• Consume particles of soil and organic material
Castings are valued by gardeners.
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Annelids: LeechesAnnelids: Leeches
The saliva of blood-sucking leeches contains an anticoagulant substance that prevents blood from clotting.
Not all leeches are blood suckers.
• More than half the species of leeches are predators.
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Take-Home Message 11.7
Worms are found in several different phyla and are not a monophyletic group.
All are bilaterally symmetrical protostomes with defined tissues.
The flatworms and segmented worms (annelids) do not molt; the roundworms do.
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Take-Home Message 11.7
Flatworms include parasitic flukes and tapeworms, many of which infect humans.
Many roundworms are parasites of plants or animals and are responsible for several widespread human diseases.
Earthworms are annelids that play an important role in recycling dead plant material.
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11.8 Most mollusks live in shells. 11.8 Most mollusks live in shells.
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GastropodsGastropods
Snails and slugs are called gastropod mollusks.
“Belly foot”
Found in both aquatic and terrestrial environments, snails and slugs account for three-quarters of all mollusks.
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Bivalve Mollusks
Clams, scallops, oysters, and mussels have a pair of shells that clamp together.
Roughly 8,000 species of bivalves—most of them live in the ocean.
All are filter feeders.
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CephalopodsCephalopods
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Take-Home Message 11.8
Mollusks are protostome invertebrates that do not molt.
They are the second most diverse phylum of animals and include snails and slugs, clams and oysters, and squids and octopuses.
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Take-Home Message 11.8
Most mollusks have a shell for protection, a mantle of tissue that wraps around their body, and a specialized tongue called a radula.
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11.1011.10 An external skeleton and An external skeleton and metamorphosis produced the metamorphosis produced the
greatest adaptive radiation ever.greatest adaptive radiation ever.
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Mammals get bigger and Mammals get bigger and bigger the more they eat. bigger the more they eat.
Why don’t insects?
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Take-Home Message 11.10
The arthropods are protostome invertebrates, and with nearly one million species (and probably at least as many more yet to be identified), they outnumber all other forms of life in species diversity.
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Take-Home Message 11.10
The ability to fly and the development of a body with a rugged exoskeleton have contributed to the enormous ecological diversity of insects.
The life cycle of most insects includes a larval stage that is devoted to feeding and growth, a pupal stage during which metamorphosis occurs, and an adult stage in which the insect reproduces.
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11.11 Other arthropods include 11.11 Other arthropods include arachnids, crustaceans, millipedes, arachnids, crustaceans, millipedes,
and centipedes. and centipedes.
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Millipedes and Centipedes Millipedes and Centipedes
• “A thousand feet” and “a hundred feet”
• Long, segmented bodies
• Millipedes feed on decaying plant material.
• Centipedes are predators; they use venomous fangs to kill insects and even small mammals.
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ArachnidsArachnids
Land-dwelling arthropods
Include spiders, scorpions, mites, and ticks
Usually have four pairs of walking legs • And a specialized feeding apparatus
Only have legs on the thorax
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Spider VenomSpider Venom
Arachnids are predators
Black widow spider
Brown recluse spider
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The CrustaceansThe Crustaceans
• Lobsters, crayfish, crabs, and shrimps
• All have five pairs of appendages extending from their heads.
• Many pairs of legs modified for many purposes
• Most are aquatic.
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Take-Home Message 11.11
Centipedes are predators with fangs that inject venom, and millipedes are herbivores that feed on dead plant material.
Spiders and scorpions are predatory arthropods that eat insects and, occasionally, small vertebrates.
Lobsters, crabs, shrimp, and barnacles are predatory marine crustaceans.
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11.12 Echinoderms are 11.12 Echinoderms are vertebrates' closest invertebrate vertebrates' closest invertebrate
relativesrelatives
And include sea stars, sea urchins, and sand dollars
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Evolutionary SpecializationEvolutionary Specialization
Radial symmetry in adults
An evolutionary specialization associated with their locomotor mode and feeding specializations
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Echinoderms and ChordatesEchinoderms and Chordates
Bilateral symmetry in larvae
The larvae have anatomical characteristics in common with the larvae of primitive chordates.
Echinoderms and chordates are each other’s closest relatives.
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Take-Home Message 11.12
Because they are deuterostomes (as are vertebrates), echinoderms are the invertebrates that are the closest evolutionary relatives to the vertebrates (and other chordates).
Their aquatic larvae are bilaterally symmetrical and share some anatomical features with chordates, but adult echinoderms are radially symmetrical.