Transcript The Lophophorates

The Lophophorates
Phylum Brachiopoda
Phylum Bryozoa
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The Lophophorates
Lophophorates
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All are sessile or sedentary adults that feed by means
of delicate ciliated tentacles
The system used in feeding is referred to a lophophore
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A circular or U shaped region around the mouth that bears 1-2
rows of hollow ciliated tentacles
All species have a very simple gonad and a Ushaped digestive tract with some form of
protective covering
The Lophophorates
Phylum Brachiopoda
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Defining characteristics
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Body enclosed within a 2
valved shell, with the valves
orientated dorsally and
ventrally
Why are lamp shells not
members of the phylum
Mollusca?
The Lophophorates
Brachia
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The Lophophorates
Where Have All the Good Times
Gone?
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Pedicle
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Brachiopods are a waning
phylum, from fossilized
12,000 spp. - 335 living spp.
The Lophophorates
Local Representatives
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Lamp Shell (Glottidia
pyramidata)
The Lophophorates
Phylum Bryozoa
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Large and conspicuous colonies, usually not
recognized as animals by “lay people”
Incorrectly called seaweed.
Primarily marine but some species are
freshwater
Bryozoans are the largest phylum of
Lophophores and the most ecologically
important
The Lophophorates
Bryozoan Forms
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Some may be soft
and bushy, (Bugula)
leafy and crisp,
(Thalamoporella) or
hard and crust like
(Membranipora or
Schizoporella)
The Lophophorates
Feeding Zooid
Colonial Metabolism
Reproduction and Lifecycle
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Individual zooids will
frequently undergo
degeneration into a brown
body
Can reproduce sexually, all
colonies are hermaphroditic
with individuals usually
being dioecious
Colonies grow from a single
founder larva (ancestrula)
The Lophophorates