Phyla Platyhelminthes, Nemertea, Nematoda, Annelida, Sipuncula, & Echiura The Worms.
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Transcript of Phyla Platyhelminthes, Nemertea, Nematoda, Annelida, Sipuncula, & Echiura The Worms.
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Phyla Platyhelminthes, Nemertea, Nematoda, Annelida, Sipuncula, & Echiura
The Worms
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I) Worms
A) Bilateral SymmetryB) True organs & organ systemsC) All have complete digestive tracts except for
flatwormsD) Mesoderm (middle cell layer)
1) Muscles, Reproductive Organs, & Other Organs
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II) Phylum Platyhelminthes
A) AKA: Flatworms
B) ~20,000 species
C) Central Nervous System1) Brain
2) Simple Nerve Aggregation
D) Turbellarians1) Free-swimming carnivores
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II) Phylum Platyhelminthes
E) Flukes (trematodes)1) Parasites: Feed on
blood, intestines, tissues
F) Tapeworms (cestodes)
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III) Phylum Nemertia
A) AKA: Ribbon Worms
B) ~900 known species
C) Primitive circulatory system
D) Proboscis1) Long, flesh tube used to
entangle prey
2) Predators
E) Longest invertebrate on Earth
1) Over 100 feet long
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IV) Phylum NematodaA) AKA: Roundworms
B) 10,000 – 25,000 known species1) Estimated to be ½
million species
2) Undercounted
C) Live in rich sediment or are parasitic
D) Hydrostatic skeleton
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V) Phylum Annelida
A) AKA: Segmented Worms
B) ~20,000 known speciesC) SegmentedD) Gut lies in cavity known
as coelomE) Hydrostatic skeletonF) Closed Circulatory
SystemG) Respiration
1) Through skin – smaller2) Gills – larger
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V) Phylum Annelida
H) Class Polychaeta1) AKA: Bristle Worms
2) Parapodia: movement
3) Setae: sharp bristles
4) Predators & Suspension Feeders
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V) Phylum Annelida
I) Class Oligochaetes1) AKA: Earthworms &
Relatives
2) Suspension Feeders
3) No Parapodia
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V) Phylum Annelida
J) Class Hirudinea1) AKA: Leeches
2) Suspension Feeders
3) Suckers on each end
4) No Parapodia
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VI) Phylum SipunculaA) AKA: Peanut WormsB) ~320 known speciesC) UnsegmentedD) Retractable tentacles
for feeding (deposit feeders)
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VII) Phylum Echiura
A) AKA: Spoon Worms
B) ~135 known species
C) Unsegmented
D) Non-retractable proboscis (deposit feeders)