Download Chapter 14 The Arthropods: Blueprint for Success

Chapter 14
The Arthropods:
Blueprint for Success
The Exoskeleton
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An external, jointed skeleton, called and
exoskeleton or curicle, enclose arthropods,
Classification of the Phylum
Arthropoda
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Phylum Arthropoda
Subphylum
trilobitomorpha
Subphylum Chelicerta
Class Merostomata
Class Arachnida
Subphylum Myriapoda
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Subphylum Crustacea
Class Remipedia
Class Cephaocardia
Class Branchiopoda
Class malacostraca
Class maxillopoda
Subphylum hexapoda
The Hemocoel
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A third characteric is the presence of a
hemocoel.
Subphlum Trilobitomorpha
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The prosoma or cephalothoraxes is a
sensory, feeding, and locomotors tagma.
The first paired, called chelicerae, are often
pincerlike or chelate, and are most often
feeding.
Posterior to the prosoma is the
opisthosoma.
Sunphylum Chelicerata
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Trilobite appendages consisted of two
lobes or rami, and are called biramous
appendages.
Form and Function
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Coxal glands are paired, thin walled
sperical sacs bathed in the blood of body
sinuses.
Malpighian tubles, absorb waste material
from the blood and empty into the gut tract.
Some arachnids posses are called book
lungs.
Order Scorpionida
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Most arthropods are oviparous; female lay
eggs that develop outside the body.
Ovoviviparous; development is internal,
although large yolky eggs provide all the
nourishment for development.