ARTHROPODA

1
ARTHROPODA

• Phylum

2
Major Classes

• Arachnids spiders, scorpions, ticks, mites
• Millipedes
• Centipedes
• Insects beetles, flies, wasps, bees,
  grasshoppers, crickets
• Crustaceans crabs, lobsters, crayfish, shrimp,
  barnacles, copepods

3
Common Features of Arthropods

• Exoskeleton(external skeleton) is made of layers
  of protein and chitin, provides attachments for
  muscles, and is impermeable to water.
• Molting shedding of cuticle in order to secrete
  a larger one. Makes the arthropod vulnerable.
• Open circulatory system hemolymph fluid flows
  through open spaces (sinuses) which surround
  organs and tissues. Important for nutrient
  transport.

http//www.youtube.com/watch?vzXhdr0TpOwY
molting spider
4
Common Features of Arthropods (cont.)

• Tracheal system branched tubes with chitin
  lining that carry O2 directly to cells (insects
  only)
• Spiracles openings in exoskeleton that allow air
  to enter tracheal system (insects only)

5
Two body plans

• Head, thorax, abdomen
• Cephalothorax, abdomen

6
Insects Mandibles and lots of mouth parts
7
Unique Arthropod Features

• Mandibles jaw-like feeding apparatuses contained
  by unimarians (centipedes, millipedes, insects)
  and crustaceans

http//www.youtube.com/watch?vJRbgsCLaAQY camel
spider eating a frog
8
Camel Spider(class Arachnida order Solifugae)
http//www.youtube.com/watch?vJRbgsCLaAQY camel
spider eating a frog

• It does not spin webs or have book lungs. Many
  rumors about the camel spiders speed, size and
  venom. In the middle east, it was said that these
  big, fast spiders would come into your tent at
  night and inject an anaesthetizing venom that
  would put its victims to sleep and feed on victim
  leaving a gaping wound. This is false, except
  that they do leave a large bite prone to
  infection.

9
Spider Feeding

• Spiders use a fang like chelicerae equipped with
  poison glands to kill prey caught in web. Instead
  of fully chewing their prey, the spider will
  spill digestive juices onto prey. This softens
  the food and the spider will suck up the liquid.

10
Unique Arthropod Features (cont.)

• Antennae sensory organs that come in pairs on
  the organisms head
• Compound eyes eyes with many parts and multiple
  separate focusing elements

11
Life Cycle

• Metamorphosis a relatively abrupt change in form
  or structure

12
Incomplete Metamorphosis grasshoppers

• Young are similar to adults, but have different
  body proportions and are smaller. There are a
  series of molts that eventually lead to the
  organism reaching full size.

13
Complete Metamorphosis
There are several distinct stages

• Larval stage - specialized for eating and growing
• Pupal Stage - actual change occurs
• Adult stage - specialized for reproduction

14
Centipede vs. milliped e

• Centipede fangs, venom,carnivore, fast moving 1
  pair of legs per segment
• Millipede slow, herbivore, rounder body, 2 pairs
  of legs per segment

http//www.youtube.com/watch?v1Jo9s80Tz-wfeature
PlayListp3260ECB787EF9616playnext1index7
giant millipede
http//www.youtube.com/watch?v2f5gBFMMmGc giant
cenitpede eating a tarantula
15
More Arthopod
http//www.youtube.com/watch?vIMPhL3lJaxY
monarch emerges
http//www.youtube.com/watch?v_QYhtMYYd9I nymph
dragonfly incomplete metamorphosis
http//www.youtube.com/watch?vlE-8QuBDkkw bee
hive
http//www.youtube.com/watch?vU4P9azs5GS0
lobster walk
http//www.youtube.com/watch?veKPrGxB1Kzcfeature
PlayListp9C3A52D20A8D88F0playnext1index7
pistol shrimp
http//www.youtube.com/watch?vSwoHVYS12oQfeature
PlayListp9C3A52D20A8D88F0index8playnext2pl
aynext_fromPL mantis shrimp