Arthropoda

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Arthropoda
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Classification of the Arthropoda
Phylum Arthropoda Subphylum Trilobitomorpha Subphy
lum Chelicerata Subphylum Crustacea Subphylum
Atelocerata
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Classification of the Arthropoda
Phylum Arthropoda Subphylum Trilobitomorpha Class
Trilobita Subphylum Chelicerata Subphylum
Crustacea Subphylum Atelocerata
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Classification of the Arthropoda
Phylum Arthropoda Subphylum Trilobitomorpha Subphy
lum Chelicerata Class Merostomata Class
Arachnida Class Pycnogonida Subphylum Crustacea
Subphylum Atelocerata
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Classification of the Arthropoda
Phylum Arthropoda Subphylum Trilobitomorpha Subphy
lum Chelicerata Subphylum Crustacea Class
Cephalocarida Class Branchiopoda Class
Ostracoda Class Copepoda Class
Mystacocarida Class Remipedia Class
Tantulocarida Class Branchiura Class
Cirripedia Class Malacostraca Subphylum
Atelocerata
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Classification of the Arthropoda
Phylum Arthropoda Subphylum Trilobitomorpha Subphy
lum Chelicerata Subphylum Crustacea Subphylum
Atelocerata Class Diplopoda Class Chilopoda Class
Symphyla Class Pauropoda Class Hexapoda
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Classification of the Arthropoda
Phylum Arthropoda Subphylum Trilobitomorpha Subphy
lum Chelicerata Subphylum Crustacea Subphylum
Atelocerata Class Diplopoda Class Chilopoda Class
Symphyla Class Pauropoda Class Hexapoda
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Classification of the Arthropoda
Phylum Arthropoda Subphylum Trilobitomorpha Subphy
lum Chelicerata Subphylum Crustacea Subphylum
Atelocerata Class Diplopoda Class Chilopoda Class
Symphyla Class Pauropoda Class Hexapoda
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Classification of the Arthropoda
Phylum Arthropoda Subphylum Trilobitomorpha Subphy
lum Chelicerata Subphylum Crustacea Subphylum
Atelocerata Class Diplopoda Class Chilopoda Class
Symphyla Class Pauropoda Class Hexapoda
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Classification of the Arthropoda
Phylum Arthropoda Subphylum
Trilobitomorpha Subphylum Chelicerata Subphylum
Crustacea Subphylum Atelocerata Class
Diplopoda Class Chilopoda Class Symphyla Class
Pauropoda Class Hexapoda
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Characteristic Features of the Hexapoda

• three distinct body regions tagmata head,
  thorax, abdomen

• three pairs of thoracic legs sometimes reduced
  or lost

• gonopore on posterior portion of abdomen

• no functional locomotor appendages on abdomen
  non-functional appendage remnants in some
  primitive hexapods

• one pair of antennae rarely lost

• one pair of mandibles

• one pair of maxillae

• hypopharynx present

• labium present

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Classification of Living Hexapod Orders
Class Hexapoda (six-legged animals)

• Entognatha (entognathous apterygotes) (3
  orders)
• Insecta (ectognatha or insects) (28 orders)

• Apterygota (ectognathous apterygote) (2
  orders)
• Innovation wings
• Pterygota (winged insects) (26 orders)

• Paleoptera (ancient-winged insects) (2
  orders)
• Innovation wing folding
• Neoptera (new-winged insects) (24 orders)

• Exopterygota (external-winged insects) (15
  orders)
• Innovation complete metamorphosis
• Endopterygota (internal-winged insects
  holometabola) (9 orders)

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FINIS