Prakticheskaia Rabota Po Biologii Za 8 Klass Klass Paukopodibni Avtor Kotik | LEGIT — 2025 |

Used for piercing prey and injecting venom/digestive enzymes.

Located at the end of the abdomen, used to produce silk for webs, cocoons, or dispersal.

The main structural features of arachnids are the division of the body into a cephalothorax and abdomen, the presence of , the absence of antennae, and the development of specialized limbs like chelicerae and pedipalps . Their adaptation to land is further supported by their water-resistant cuticle and specialized respiratory systems. Used for piercing prey and injecting venom/digestive enzymes

A dense outer covering that prevents excessive water loss (desiccation).

To study the external structure of arachnids (using the European garden spider as an example) and identify features related to its adaptation to life on land. I. External Structure Observations Their adaptation to land is further supported by

Includes lung books and/or tracheae, allowing for gas exchange in air. III. Comparison Table (Sample) Crustaceans (for comparison) Arachnids (Arachnida) Body regions Cephalothorax, Abdomen Cephalothorax, Abdomen Walking legs 5 pairs (usually) Antennae Eyes Compound (faceted) IV. Conclusion

Serve as sensory organs (touch) and aid in food manipulation. Limbs on the Cephalothorax:

The body consists of two main sections: the cephalothorax (front) and the abdomen (back), connected by a narrow stalk. Limbs on the Cephalothorax: