Transcript Encyklopedia Britannica Online

Arachnida
Jake Reicker, Jacqueline
Bradbury, Brandon Nilsen,
Josh Cullen
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.
Distinguishing Physical Traits
 Chelicerae & Pedipalps
 Bodies are in two parts
Behavioural Traits
 Cannibalism
 Males give gifts and dance to attract mates
 Solitary lifestyle
 Largely inactive,
opportunistic eaters
Peacock spider mating dance
Environment
 Spiders
 Found on every continent
 Almost every terrestrial habitat
 Scorpions
 Found on all continents
(bar Antarctica), though not natively to all.
 Found in every terrestrial habitat with the exception of boreal habitats.
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
evolution
Exoskeleton 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.
Sources
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