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Arachnids: Characteristics, Anatomy, and Life Cycle

Discover the fascinating world of arachnids - creatures with 8 legs and incredible abilities like silk production and hydraulic leg movement. Explore the anatomy, life cycle, and fun facts about spiders, scorpions, and ticks.

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Arachnids: Characteristics, Anatomy, and Life Cycle

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  1. ARACHNIDA

  2. CHARACTERISTICS • Characteristics of a typical arachnid include: • Four pairs of legs (8 legs total) • Four pairs of eyes (8 eyes total) • They have a cephelathorax (a head and thorax fused together) • They don’t have antennas • They perform respiration via book lungs

  3. Spider External Anatomy

  4. Spider Legs http://www.uky.edu/Agriculture/CritterFiles/casefile/spiders/anatomy/leg.png

  5. Spider Internal Anatomy

  6. Spinnerets http://www.dianamarques.com/images/spinnerets.jpg http://www.pbrc.hawaii.edu/bemf/microangela/mspigot7o.jpg

  7. Silk • Spiders have six spinnerets that can produce up to seven different types of silk. • Spider silk is made of protein and is one of the strongest natural substances in the world.

  8. Some organisms that are found in the arachnida class are: • Spiders • Ticks • Scorpions

  9. ORGANISIMS • SPIDER SCORPION TICK • Kingdom: Animalia Animalia Animalia • Phylum: Arthropoda Arthropoda Arthropoda • Class: Arachnida Arachnida Arachnida • Order: Araneae Scorpiones Ixodida • Family: Theridiidae Vaejovidae Ixodidae • Genus: LatrodectusVaejovis AmblYomma • Species: L. hesperus V. brysoni A. ovale

  10. AmblYomma ovale • Latrodectus hesperus • Vaejovis brysoni

  11. DIAGRAM OF A SPIDER • Uses 8 legs to move around • Gets food by trapping it in a web • Can spin webs by using a special silk gland • Can kill prey by using it’s Poisonous fangs (females only)

  12. ANATOMY OF A SPIDER • Spiders transport nutrients and oxygen by circulating blood through their bodies • Most arachnids lack muscles in their legs, so they move their legs hydraulically by using the blood pressure in their legs • Spiders exchange gases using an organ called a Book-Lung • book lung is made of several air pockets surrounded by blood filled tissues • Spiders use book lungs to perform respiration • Spiders can not eat their food in solid form • When a spider catches its prey, it turns it into a liquid by using digestive juices produced in its stomach • The spider sucks up the liquid remains and absorbs its nutrients

  13. LIFE CYCLE • An infant arachnid will hatch from an egg • The infant arachnid grows up into an adult • The adult arachnid will eventually find a mate • An adult male will transfer sperm to a female • Female lays eggs • New arachnids hatch from eggs

  14. FUN FACTS • Almost all arachnids are carnivores • Spiders eat more insects than birds and bats combined, and play a big role in insect population control • Spiders can regenerate lost limbs, just like reptiles

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