Arthropoda - Arthropoda "Jointed Foot" * 2/3 of animals are...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
Arthropoda “Jointed Foot” * 2/3 of animals are Arthropoda A. Important Features 1. Paired, jointed appendages- more flexibility 2. Exoskeleton a. advantages- protection against predators, drying out, and support b. disadvantages- restrict movement; molt (shed exoskeleton) to grow (leaves them vulnerable) 3. Open circulatory system- heart, large vessels, hemocoel (sinus or cavity) 4. Segmented body a. Head If fused: Cephalothorax b. Thorax c. Abdomen B. Gas Exchange 1. Gills 2. Tracheae
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
C. Examples 1. subphylum: Trilobitomorpha a. Trilobites- extinct, three segments, single pair or antenna , gills (aquatic), biramous (branched) claws - gave rise to crustaceans and chelicerata 2. Chelicerata
Background image of page 2
a. Arachnida- Ex) spiders, scorpions, scorpions, mites, ticks - cephalothorax , abdomen - six pairs of jointed appendages i. chelicerae - modified as fangs (inject poison and enzymes, and suck and digest prey’s guts) or pincers (grab, pinch) ii. pedipalps - used for holding prey iii. walking - eight legs
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/07/2008 for the course BS 131 taught by Professor Smith during the Spring '08 term at University of the Sciences in Philadelphia.

Page1 / 5

Arthropoda - Arthropoda "Jointed Foot" * 2/3 of animals are...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online