1. Chapter 14 The Arthropods: Blueprint for Success

2. The Exoskeleton
An external, jointed skeleton, called and exoskeleton or curicle, enclose arthropods,

3. Classification of the Phylum Arthropoda
Subphylum trilobitomorpha
Subphylum Chelicerta
Class Merostomata
Class Arachnida
Subphylum Myriapoda
Subphylum Crustacea
Class Remipedia
Class Cephaocardia
Class Branchiopoda
Class malacostraca
Class maxillopoda
Subphylum hexapoda

4. The Hemocoel
A third characteric is the presence of a hemocoel.

5. Subphlum Trilobitomorpha
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.

6. Sunphylum Chelicerata
Trilobite appendages consisted of two lobes or rami, and are called biramous appendages.

7. Form and Function
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.

8. Order Scorpionida
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.