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Subphylum Chelicerata Class Arachnida: Order Araneae

Subphylum Chelicerata Class Arachnida: Order Araneae. Distinguishing body features. Pairs of appendages which include: - Chelicerae- mouth parts -Pedipalps- used for sensory, food manipulation, mating - 4 Pairs of walking legs Ceplalothorax (head+thorax) Abdomen Pedicel.

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Subphylum Chelicerata Class Arachnida: Order Araneae

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  1. Subphylum ChelicerataClass Arachnida: Order Araneae

  2. Distinguishing body features Pairs of appendages which include: -Chelicerae- mouth parts -Pedipalps- used for sensory, food manipulation, mating - 4 Pairs of walking legs Ceplalothorax (head+thorax) Abdomen Pedicel

  3. Additional body Characteristics Claws at end of legs and Fangs at tipes of chelicerae Poison Glands 8 simple eyes to detect movement

  4. Feeding Spiders are predacious fluid feeders Most feed on insects Different spiders chase, amush or trap prey in silk

  5. Silk Production Silk glands located in the abdomen 2 or 3 pairs of spinners Thread is stronger then silk Silk may be used for: webs line nets sperm webs or egg sacs wrap prey throw nets

  6. Reproduction Male pedipalps deliver sperm to the female genitals Cocoon contains hundreds of eggs On average it takes two weeks for eggs to hatch Babies remain for another three weeks developing

  7. Humans and Spiders Spiders are very timid Help us battle insects Most spider bites cause irritation Example: Tarantula bite = to bee sting

  8. Fatal Spiders Latrodectus dectus aka black widow shiny, black body with red or orange hour glass on ventral side neurogenic venom affects nervous system Loxosceles skelos aka brown recluse brown with violin shape on anterior dorsal side hemolytic venom affects blood and blood

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