Arthropods & Echinoderms Flashcards
3 Common Characteristics of Arthropods
Tough exoskeleton, jointed appendages, segmented body
Chitin
Material that makes exoskeleton
4 Purposes of Exoskeleton
- Body support
- Protection of soft body parts
- Attachment point for muscles
- Prevents water loss
3 Segments of Arthropod
Head, Thorax (contains internal organs), abdomen (posterior part of the body)
Cephalothorax
Arthropod with head and thorax fused together.
3 Ways of Respiration in Arthropods
Gills, Book gills/Book Lungs, Tracheal Tubes.
Spiracles
Air enters and leaves through here, leads to tracheal system
Type of Circulation in Arthropods
Open Circulatory System
Types of Mouthparts in Arthropods
Pincers, Fangs, Sickle-shaped jaws
Malpighian Tubules
Organ to dispose of ammonia
Nervous System of Arthropods
Well developed.
Compound Eyes (How Do They Detect Stimuli?)
Detects color and motion, more than 2000 lenses
Reproduction (Arthropods)
Internal
Male deposits sperm packet picked up by female
External: Eggs are released, males shed sperm around eggs.
4 Subphyla of Arthropods
Trilobita (extinct), Chelicerata (Spiders, scorpions, mites, ticks), Crustarea (crabs, crayfish, lobsters), Uniramia (millipedes, centipedes, insects).
Incomplete Metamorphosis Cycle
Egg to Nymph
Complete Metamorphosis Cycle
Egg, Larva, Pupa, Adult
Ecological Significance of Arthropods
Source of food
2/3 of flowering plants depend on arthropods for pollination
Symbiotic Relationships of Arthropods
Bull horn Acacia tree/ants
Fish and Shrimp
Economical Importance of Arthropods
Silkworm, honey, food, medicine (chitin used to dress wounds and make thread), agriculture
Symmetry of Echinoderms
5 part radial symmetry
Examples of Echinoderms (6)
Sea Stars
Brittle Stars
Sea Urchines
Sand Dollars
Sea Cucumbers
Sea Lilies
Feeding (Echinoderms)
Carnivores, use tube feet to open shells and enzymes to digest prey.
Respiration (Echinoderms)
Skin gills
Nervous System (Echinoderms)
Nerve ring around mouth, radial nerves in arms. Clustered eyespots
Reproduction (Echinoderms)
Gametes shed into open water. Some hermaphrodites
