Arthropods Flashcards
Number of Arthropod species identified by scientists
1,000,000
Number of arthropod species that are insects
600,000
Largest species group within the Arthropods
Beetles
Number of beetle species identified
350,000
Number of crustaceans
38,000
Number of Arachnids
57,000
3 major “firsts” of Arthropods
- Jointed appendages
- Compound eye
- Wings / can fly
4 functions of mouth parts
- Rip
- Tear
- Chew
- Suck
3 characteristics of arthropod bodies
- Exoskeleton
- Open circulatory system
- Nerve cord with ganglion all along it
What is molting?
The process by which Arthropods grow. They shed their exoskeleton, exposing a softer layer which will harden over time.
Maxillae
Mouth part that holds and rotates food
Mandible
Mouth part that has teeth and chews
Compound eye
Can see thousands of images, lens, retina
Antenna
Sensory organ (can sense shape and temperature)
3 body segments of insects
- Head
- Thorax
- Abdomen
2 Body segments of crustaceans
- Cephalothorax (fused head and thorax)
2. Abdomen
Function of forewings
Flight
Function of hindwings
Balance in flight
Number and function of walking legs
2 pairs
Provide balance while walking
Jumping legs
Rub together and create sound that attracts mate
Ovipositor in male grasshopper
Use it to deposit it sperm into female
Ovipositor in female
Accepts sperm and releases fertilized egg
Spiracles
Used for breathing
Tympanic membrane
Used for hearing, picked up sound
Malpigian tubes
Removes waste
Metamorphosis
Larva and adult look different
6 characteristics of crustaceans
- Keloped
- Cephalothorax
- Aquatic
- 3 mouth parts
- Largest arthropod
- Hardest exoskeleton
How are centipedes and millipedes different?
A centipede has one pair of legs on each body section and a millipede has two pairs of legs on each body section.
Give 3 characteristics of Arachnids
- 8 legs
- All carnivores
- All terrestrial
What is the only type of arthropod to give live birth?
Scorpions
What is the oldest known Arthropod?
Horseshoe crab
