Download - Phylum Arthropoda (Valanga sp.)
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Phylum Arthropoda(Valanga sp.)
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LEARNING OUTCOMES(c) Discover the unique characteristics of the following phyla:
vi. Arthropoda (e.g: Valanga sp.)
vii. Mollusca (e.g: Achatina sp.)
viii. Echinodermata (e.g: Asterias sp.)
ix. Chordata (e.g: Amphioxus sp.)
(d) Explain evolutionary relationships of animals based on their:
i.Level of organization
ii.Germ layers
iii.Body symmetry
iv.Body coelom
v.Segmentation
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Unique Characteristics
Bilaterally symmetrical
Coelomate
Triploblastic
Paired segmented
appendages
Paired segmented appendages
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Unique Characteristics
Segmented bodiesCephalization - Head, thorax
& abdomen
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Unique Characteristics
Exoskeleton with chitin Open blood circulation system
Hemocoel (blood cavity)Complete digestive
system
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Unique Characteristics
Excretory system
Nervous system
Exoskeleton
Highly developed sensory
organs
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Unique Characteristics
Reproduction - Separate sexes
Male
Female
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Unique Characteristics
Respiration- Tracheal system
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PHYLUM MOLLUSCA(Achatina sp.)
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Unique Characteristics
Asymmetry
Coelomate
Triploblastic
Unsegmented / head
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Unique Characteristics
Body plan Complete digestive
system
Mouth has radula
Excretory organs
- Nephridia
Circulatory system
-open / close
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Unique Characteristics
Respiratory system - gills or
lung in the mantle cavity Advanced nervous system
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PHYLUM ECHINODERMATA(Asterias sp.)
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Unique Characteristics
Bilaterally symmetrical
(Larvae)
Unsegmented
Radial symmetrical
(Adult)
Triploblastic
Larvae Adult
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Unique Characteristics
No head
Anus on upper (aboral)
surface
Mouth generally on
lower surface of body
Tube feet
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Unique Characteristics
Simple nervous system without brain
No respiratory or
excretory systems
No circulatory
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Water vascular system
Unique Characteristics
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Unique Characteristics
Endoskeleton
Reproduction
• Hard calcium carbonate plates and
spines
• Sexual reproduction
• Asexual reeproduction
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Reproduction
Unique Characteristics
- Hermaphrodites (individuals have both a male
set and female set of parts)
- Bisexual (Sepatarated genders)
- Most are internal fertilization, some are external.
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PHYLUM CHORDATA(Amphioxus sp.)
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Unique Characteristics
Bilateral symmetrical Coelomate
Triploblastic Has notochord
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a cartilaginous skeletal rod supporting the body
in Amphioxus sp.
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⮚ Hepatic portal system
blood from alimentary canal taken to liver
and taken
back to the heart
⮚ Heart is ventral position
found behind and below pharynx.
Unique Characteristics
Close circulatory system
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Unique Characteristics
Myotomes
• Muscular tissues arranged in blocks
• Present in embryonic stage
• Maintained in some adults chordates
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(d) Evolutionary Relationship
of Animals based on:
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(i) Level of organization
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(ii) Germ layers
Diploblastic
❖Phylum Cnidaria
Triploblastic
❖Phylum
Platyhelminthes to
Phylum Chordata
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(iii) Body symmetry
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(iv) Body coelom
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(v) Segmentation
Pheretima sp.
Ascaris sp.
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