Arthropods

Arthropods are a diverse group of invertebrate animals that make up over 80% of all known living animal species. They are characterized by having a segmented body, a tough exoskeleton made of chitin, and jointed appendages.

Characteristics of Arthropods

• Segmented body
• Exoskeleton made of chitin
• Jointed appendages
• Bilateral symmetry
• Open circulatory system
• Nervous system with a dorsal brain and ventral nerve cord

Classification of Arthropods

Arthropods are classified into five main subphyla:

1. Trilobitomorpha
2. Chelicerata
3. Myriapoda
4. Crustacea
5. Hexapoda

Diversity of Arthropods

Arthropods exhibit incredible diversity and include familiar groups such as insects, spiders, scorpions, crustaceans, and millipedes, as well as less well-known organisms such as horseshoe crabs and velvet worms.

Ecological Importance

Arthropods play a crucial role in ecosystems as pollinators, decomposers, and food sources for other organisms. They also have significant economic and medical importance, as some species are pests or vectors for diseases.

Study Tips

• Memorize the key characteristics of arthropods.
• Practice categorizing different arthropod groups into the five subphyla.
• Explore the ecological roles of arthropods and their significance in human society.
• Use diagrams and illustrations to understand the anatomy of arthropods.

[Arthropods] Related Worksheets and Study Guides:

• Mollusks, Arthropods and EchinodermsScience • Sixth Grade
• Invertebrates - Animals without BackbonesScience • Fourth Grade
• Animal Diversity and AdaptationsScience • Fifth Grade