Arthropods: Articulated body invertebrates
What they are - biological definition
Arthropods are invertebrate animals that have rigid articulated body parts. We find in the wild more than one million species of arthropods, either aquatic or terrestrial.
Main characteristics of arthropods:
- Segmented body.
- Articulated appendages (limbs).
- Presence of external skeleton (exoskeleton) formed by chitin (high resistance polysaccharide).
- Most arthropods have internal fertilization.
- They change the exoskeleton several times until they reach adulthood.
Examples of arthropod animals
- Crustaceans: shrimp, crabs, lobsters, armadillo, etc.
- Insects: flies, mosquitoes, butterflies, crickets, grasshoppers, ants, bed bugs, cockroaches, etc.
- Arachnids: spiders, mites, ticks, scorpions, opilions, etc.
- Kilopods: centipedes (centipedes)
- Arthropods are the largest (number) phylum of animals that inhabit our planet. Most arthropods are insects.
Black scorpion, example of poisonous arthropod.