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Characteristics of Phylum:
Platyhelminthes
• Mostly parasitic
• Organ level organization (no specialized
circulatory or respiratory structures)
• Have undergone cephalization (have
head)
• Ladder-type nervous system (no spinal
cord)
• Bilateral symmetry (rt. & lt. side)
What is the class and the common name?
Turbellaria - planarian
What is the class, genus and common name?
Trematodes – Fasciola - fluke
What is this? What is
the class, genus and
common name?
Scolex – Cestodes –
Taenia - tapeworm
Identify what this is.
tapeworm↓
Characteristics of Phylum:
Annelidae
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Segmented
Marine
Use body pressure to give body form
Have setae (bristles) for movement
What is the class and
common name?
Polychaete - clamworm
Identify this.
earthworm↓
What is the class and common
name?
Oligochaete - earthworm
Identify this.
earthworm↓
Characteristics of Hirudinea:
-Fresh water
-Two suckers
-No setae
-Prevent clotting by means of
hirudin, a powerful anticoagulant
What is the class and
common name?
Hirudina - leech
Label this part of the earthworm
Answers
13. Intestines
16. Nephridium – bladder & excretory tubules
36. Setae
LABEL
Answers
6. Mouth
8. Pharynx
9. Esophagus
10. Calciferous glands
11. Crop
12. Gizzard
13. Intestines
16. Nephridium – bladder & excretory tubules
23. Hearts
25. Brain
30. Seminal vesicles – sperm sacs
32. Ovary
34. Clitellum
36. Setae
37. Septa
LABEL
Characteristics of Phylum:
Nematoda
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Roundworms
Complete digestive tract
Tell males from females
Have cloacae (common opening)
Males have spicules
What class does this belong?
Trichinella
What disease does this worm cause?
Trichinosis
What class does this belong?
Ascaris→
Where is this worm found?
Intestinal tract→
Characteristics of Phylum:
Mollusca
• Three part body
– Visceral = contains internal organs
– Mantle = may secrete shell and/or contribute
to the development of gills or lungs
– Foot = muscle for locomotion, attachment, or
food capture
What class does this belong and what is the
common name?
Cephalopoda - squid
What class does this belong and what
is the common name?→
Cephalopoda - octopus
What class does this belong and
what is the common name?
Gastropoda – land snail
What class does this belong and
what is the common name?→
Gastropoda - slug
What is the class and common name?
Bivalvia - clam
What is the class and common name?
Bivalvia - clam
What is the class and common name?
Bivalvia - scallop
What is the class and common name?
Bivalvia - scallop
What is the class and common name?
Bivalvia - mussel
LABEL
ANSWERS
1. SHELL
6. MUSCLE
8. MANTLE
9. FOOT
18. KIDNEY
21. GILLS
22. VENTRAL (INCURRENT) SIPHON
23. DORSAL (EXCURRENT) SIPHON
28. HEART
LABEL
ANSWERS
5. Muscle
6. Muscle
8. Mantle
9. Foot
10. Mouth
11. Labial palps
12. Esophagus
13. Stomach
14. Digestive gland
15. Intestine
18. Kidney
21. Gills
28. Heart
40. gonad
AA
B
E
D
IDENTIFY THESE
C
ANSWERS
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A. Clam
B. Scallop
C.
D.
E. Snail
Phylum:Platyhelminthes
• Classes
– Turbellaria (planarians)
– Trematodes (flukes/Fasciola)
– Cestodes (tapeworms/Taenia)
Planarians (flatworms)
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Fresh water
No anal
Pharynx on belly
Flame cells function as kidneys
Have testes and ovaries
Three muscle layers which allow movement in all
directions
– Outer
– Inner
– diagonal
• Head is bluntly arrow shaped
– Two light sensitive eye spots
– Auricles function as sense organs
Flukes (flatworms)
• Parasitic
• Well developed nerves and gastro cavity
are NOT necessary
• All parasites will have at least two hosts
Tapeworms (flatworms)
• No mouth
• Lay in digestive tract and live off juices
• Have head (scolex) and rest are segments
that will have eggs and exit in feces
Phylum:Nematoda
• Classes
– Trichinella (roundworms)
– Ascaris (roundworms)
Phylum:Annelidae
• Classes:
– Polychaete (clamworms)
– Oligochaetes (earthworms)
– Hirudinea (leeches)
Clamworms
• Have jaw
• Parapodia (gills and paddles)
Earthworm
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Have five hearts
Crop
Clitellum (attach to reproduce)
Gizzard breaks down food
Central nervous system
Have ovaries and testes
Leeches
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Fresh water
Two suckers
No setae
Prevent clotting
Phylum:Mollusca
• Classes:
– Bivalvia (clams, scallops, mussels, oysters)
– Gastropoda (snails, slugs)
– Cephalopoda (octopus, squid)
Clams, Scallops, Mussels, Oysters
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Gills gather oxygen and filter feeds
Tongue cleans gills and organs for food
Small ganglion (brain)
Same organs we have
Liver = digestive gland
Adductor muscles hold shell together
Sexes are separate
Snails, Slugs
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Crawl on stomach and secrete slime
Coiled shell
Tentacles w/ eye stalks
Gills are in mantle
Mantle functions as lungs
Organ system like Bivalves
Radula (tongue) = rough
Octopus, Squid
• Head footed
• Tentacles and arms capture prey by using
suckers
• Well developed sense organs
• Octopus = slow
• Squid = fast
• They are predators