ch. 10 platyhelminthes (flatworms) - parkway schools
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Myxozoa
Arthropoda Annelida
Mollusca
Lophophorates
Hemichordata
Chordata
Other
pseudocoelomates
Nematoda
Porifera
Ctenophora
CnidariaPlacozoa
Platyhelminthes
Nemertea
Ciliophora
Sarcomastigophora
Microspora
Apicomplexa
Mesozoa
Echinodermata
CrustaceaChelicerata
Uniramia
Protochordates
Class Turbellaria• Ex: Planaria
• Free living. Some in
fresh and some salt
water. Beating cilia
create turbulence in
water.
• Predators &
scavengers.
Carnivores.
• Food gets sucked into
intestine. Waste goes
back out through
pharynx.
Turbellaria
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Sense Organs
• Auricles- look like
earlobes. Have
chemoreceptors for
food location.
• Ocelli- light sensitive
eyespots
Class Monogenea• Ex: Flukes
• Single Host- eggs
hatch, then attach.
• External parasites
(mainly on fish, some
frogs, turtles)
• Usually don’t harm
host
Class Trematoda• Ex: Flukes
• Parasites of vertebrates (as adults)
• Complex life cycle-many intermediate stages.
• Usually “shelled eggs” leaves host in excrement & reaches water to develop further.
Class Cestoidea
• Ex: Tapeworms
• Parasites inside
vertebrate digestive
system.
• Lack mouth &
digestive tract.
Absorb nutrients
through body wall
(tegument).
Class Cestoidea
• Scolex- suckers &
hooks for attachment
to host intestine.
• Proglottids-
reproductive
segments (in a chain).
• Requires at least two
hosts.
Class Cestoidea
• Reproduction: new
proglottids form
behind scolex. Cross
fertilize. Shelled
embryos expelled
through uterine pore.
• OR, entire proglottid
breaks off.