Arthropods Flashcards
Arthropods
Segmented invertebrates with jointed appendages
Jointed appendages
Body extension such as leg or antenna
What is the function of the exoskeleton in arthropods
Provides support and protection, made up of protein bound to chitin
What is Molting?
The way in which arthropods grow, by shedding their exoskeleton
Crustacea
2 pairs of antennae, chewing mouthparts. Lobsters cray fish and shrimp
Uniramia
One pair of antenna. Insects, millipeds and centipede
Chelicerata
Have a pincer like mouthparts and no antennae. Spiders and scorpions
Cephalothorax
The fused head and chest region
What is the carapace
A hard shell covering the cephalothorax
Abdomen
The long narrow tail region
Antennae
2 pairs used for balance taste and touch
Mandibles
Jaw like, chew and crush food
Jaw feet
Called maxillipeds, these 3 pairs of jaw feet hold and taste food
Pinching claws
Called chelipad, used for catching food and for defence
Walking legs
4 pairs on the last 4 segments used for locomotion
Swimmerets
Used for locomotion and transfer of sperm (in males)
Feathery gills
Attached to the walking legs used for respiration
Gill bailers
Move water across the gills so respiration can continue
Chitonous teeth
Present on the stomach wall these teeth grind food particles
Digestive gland
Where the small particles are sent from the stomach
Green gland
Regulates the amount of salt and liquid in the blood
What type of circulatory system?
Crayfish have an open circulatory system
Compound eye
Composed of hundreds or thousands closely packed lenses used for detecting predator and prey
Trachea
Present in insects. Air enters through small holes in the exoskeleton
Esophagus
Passes food from the mouthparts to the corp
Corp
Temporary storage for food
Gizzard
Grinds up food
Midgut
Absorbed nutrients passes undigested nutrients into the intestine
Malpighian tubules
Filter waste from body fluid. Get rid of metabolic waste
Tympanum
Insects use for hearing
Complete metamorphosis
The baby looks nothing like the adult when it is born
Incomplete metamorphosis
Looks like a carbon copy of the adult (smaller)
Echinodermata
Marine invertebrate with spiny skin, radial symmetry, water vascular system
-sea star
Water vascular system
Network of fluid filled tubes used for transport
Tube feet
Hallow thin walled structures that have a suction cup at the end
Ampulla
Located on the top of each tube foot helps force water through the water vascular system
Lower stomach
Sea star pushes the lower stomach through its mouth and onto prey. The stomach is then pulled in to the body to digest
How do sea stars reproduce
They can either reproduce sexually or asexually. They have separate sexes
Nerve ring
Coordinates movement by receiving signals from receptor cells
What gives echinoderm their spiny skin
Endoskeleton of calcium supports the echinoderm
Asteroidea
Sea stars, have 5 or more arms
Ophiuroidea
Brittle and basket star, move quickly compact size.
Crinoidea
Sea lilies and feather stars. Sessile traits while they are Los able to break away
Echinoida
Sea urchin and sand dollar, shaped like spheres or discs
Holothuroidea
Sea cucumber, no arms bilaterally segmented
What are the three subphyla of chordates
Lancelets, tunicates and vertebrates
