ArthropodsBy: Ethan Jones and Xavier

Arthropods

• Makes up 3/4's of all animal species -total number of arthropod species is MORE than all other species combined

• Includes insects, spiders, & crustaceans

• Arthropod means "jointed foot" - all arthropods have jointed appendages

• Segmented body

• Exoskeleton for protection & support

• Exoskeleton is shed during molting

• Open circulatory system

• Compound eyes (has many individual units)

• Excretory structures called Malpighian tubules

• Wings in many groups

• Respiration using spiracles and trachae

Segmentation

More obvious in larval forms, adults have fused segments -----> Head | Thorax | Abdomen

Some have a fused head and thorax -- the cephalothorax

Taxonomy----->

Subphylum Chelicerata

• spider

• Includes Class Arachnida) spiders, ticks, scorpions, mites and horseshoe crabs

• Have a cephalothorax (fused head and thorax) and abdomen

• No antenna

• Spinnerets in spiders make webs

• Have 6 pairs of jointed appendages:

• Chelicerae - claws or fangs (1 pair) - (spiders have venom)

• Pedipalps - used for feeding, sensing, transferring sperm (1 pair)

• Walking legs - movement (4 pairs)

Subphylum Crustacea

• Marine members include shrimp, lobster, barnacles, & crabs

• Terrestrial crustaceans called isopods (pillbugs or rollypollys)

• Freshwater members include crayfish and daphnia

• All have mandibles for chewing or tearing

• Have cephalothorax and abdomen

• Lobsters and large custraceans are called Decapods

• Barnacles are sessile (don't move)

• Have 10 pairs of jointed appendages

• Breathe through gills

Subphylum Uniramia

• - Insects and their Relatives

• Includes 3 classes --- Chilopoda (centipedes), Diplopoda (millipedes), & Insecta

Class Chilopoda

• Centipedes (predators)

• Name means "100 legs"

• Flattened body

• Have 1 pair of legs per body segment

• Pincers can inject venom

Class Diplopoda

• Millipedes

• Name means "1000 legs"

• Have 2 pairs of legs per body segment

• Rounded body

• Scavengers or herbivores

Class Insecta

• 3 pairs of legs

• 3 body parts - head, thorax, abdomen

• Wings in most

• All appendages attach to the thorax

• 9-11 segments in abdomen

• Mandibles for chewing

To wrap it all up!

• EES Sub Assignment

• All work is to be submitted to substitute at the end of class for a quiz grade.

• Glencoe Earth Science Text Book

• Chapter 14

• • Define vocabulary words on pages 359, 364, 369, and 375 in complete sentences.

• • Read and summarize, in complete sentences, Chapter 14 with separate sections for 14.1, 14.2, 14.3, and 14.4.

• • Complete Section Assessments on pp. 363, 368, 374, and 377. Answer in complete sentences

• • Complete Problem Solving Lab on p. 360. Answer questions in complete sentences.

• • Read and Summarize in complete sentences, Global Warming on p. 380.

• • Complete the procedure and challenge portion of Global Warming on p. 380. All answers must be in complete sentences.

• • Complete the Chapter Assessment on pp.382-383. Write questions and answers using complete sentences where applicable