Jake Reicker, Jacqueline Bradbury, Brandon Nilsen, Josh Cullen

Arachnida

Introduction Phylum: Arthropoda Subphylum: Chelicerata Class: Arachnida Number of Known Families: 648 Order:

Acari, Amblypygi, Araneae, Haptopoda, Opiliones, Palpigradi, Phalangiotarbida, Pseudoscorpions, Ricinulei, Schizomida, Scorpiones, Solifugae, Trigonotarbida and Thelyphonida.

Distinguishing Physical Traits 8 Legs in Adult Life

Stage Breath by Book Lungs Do not possess jaws,

antennae or wings.

Chelicerae & Pedipalps Bodies are in two parts

Distinguishing Physical Traits

Behavioural Traits Cannibalism Males give gifts and dance to attract

mates Solitary lifestyle Largely inactive,

opportunistic eaters

Peacock spider mating dance

Environment

Scorpions Found on all continents

(bar Antarctica), though not natively to all. Found in every terrestrial habitat with the exception of boreal

habitats.

Spiders Found on every continent Almost every terrestrial

habitat

Environment Ticks & mites

Terrestrial & aquatic Widely distributed – Warm, humid

climates Mites in the Antarctic Two requirements must be met for an ecosystem to

support ticks High host population High humidity

Common microclimate features: sandy soil; hardwood trees; rivers; and the presence of deer.

Evolution Arachnida evolved from the group Chelicerata Complex relationship between orders Four main categories Stethostomata,

Haplocnemata, Acaromorpha & Pantetrapulmonata

Scorpions among first land based animals with other species of arachnids appearing later

Evolutionary Advantages Arachnids are an extremely robust species

due to their evolutionExoskeleton is strong, lightweight and

water proof Ease of movement Sensory organs

Life cycle/reproduction

Life cycle/reproduction

Fun Facts Spiders produce seven kinds of

silk - Ranging from sticky silk to trap prey, to super-strong thread for support

Scorpions are among the only animals known to survive nuclear exposure and they also glow under UV light

Arachnida is a part of the biggest and most diverse phylum; Arthropoda. It consists of ~1.1mil species recorded.

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