5. bryozoa brachiopoda and nematoda
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Transcript of 5. bryozoa brachiopoda and nematoda
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Animals that are Moss like
Phylum Bryozoa
Common characteristics
Food capturing organ called a lophophore
Colonial – asexually produced and interconnected
Exoskeleton called a zooecium excreted by individual zooids
No specialized organs for excretion, gas exchange or circulation
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Animals that are Moss like
Phylum Bryozoa
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Animals that are Moss like
Phylum BryozoaCnidarian Hydroid Polyp Bryozoan Zooid
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Animals that are Moss like
Phylum Bryozoa
• Many different growth forms with the zooecium made from calcium, chiton or protein
• Erect and branching– e.g. Bugula sp – The spiral bryozoan
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Animals that are Moss like
Phylum BryozoaMany confuse them with hydroids or with corals• e.g. Heteropora sp.the staghorn bryozoan
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Animals that are Moss like
Phylum Bryozoa• Some look more like a fungus than moss• e.g. Hippodiplosia sp. the fluted bryozoan
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Animals that are Moss like
Phylum Bryozoa
Many others are encrustinge.g. Membranipora sp.
the lacy kelp bryozoan
e.g. Disporella sp.
The purple bryozoan
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Animals that are Moss like
Phylum Bryozoa
Byrozoan Polymorphism
Different zooids can perform different functions• Autozooids for feeding
and reproduction
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Animals that are Moss like
Phylum Bryozoa• Zooid is a single sex• Colonies are hermaphroditic• Ovicells are brooding chambers in
the colony• Free swimming larva emerge from
ovicell, settle onto a suitable substrate and metamorph
• First zooid in a colony = ancestrula• Forms new colonies by asexual
budding
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Animals that are Moss like
Phylum Bryozoa
Byrozoan Polymorphism
Different zooids can perform different functions• Heterozoids for cleaning
and protection
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Animals that are Moss like
Phylum Bryozoacommon predators are crabs and nudibranchs
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Animals that are Clam like
Phylum Brachiopoda
Common NameLampshells
Common CharacteristicsBivalved shellLophophorePeduncular stalk for
attachment
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Animals that are Clam like
Phylum Brachiopoda
They resemble clams • Calcareous bivalved shell (but
not the same size or shape)• Adductor muscle• Mantle
They resemble bryozoans• Lophophore• No special organ for gas
exchange
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Animals that are Clam like
Phylum Brachiopoda
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Animals that are Clam like
Phylum Brachiopoda
• 350 current species, as many as 30,000 known fossil species
• Dioecious broadcast spawners
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Animals that are Worm like
Phylum Nematodaone of the largest animal phyla occurring freely and abundantly almost everywhere
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Animals that are Worm like
Phylum Nematoda• Unsegmented with a
cylindrical body shape• Covered by a tough
exoskeleton – collagenous cuticle
• Cuticle sheds (molts) as the nematode grows
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Animals that are Worm like
Phylum Nematoda
• Complete digestive tract
• No circulatory system
• Muscles are all longitudinal – thrashing motion
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Animals that are Worm like
Phylum Nematoda
• Eutely (constancy of cell number)
• Epithelium is syncytial (many nuclei but not separated by a cell membrane
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Animals that are Worm like
Phylum Nematoda• Many parasitic
forms • Cuticle around
mouth with teeth like projections
• Cuticle protects from host digestive juices
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Animals that are Worm like
Phylum Nematoda• Dioecious with internal
fertilization• Sperm cells amoeboid
(not flagellated• Females can release
>100,000 eggs per day• No free-swimming larval
stage (emerge from egg as miniature adults)
• Dauer larva (a stage of developmental arrest)