Phylum arthropoda

1. ARTHROPODA
Gk. “arthros”– joint + “podos”– foot

2. V
A
R
I
E
T
Y

3. Hermit Crab
Fairy Shrimp
Centipede
Horseshoe
Crab

5. Size
Color
Shape
Method of Movement

6. Jointed Legs
Exoskeleton
Segmented Body
Distinct Head
Compound Eyes
(most cases)

7. •Common throughout marine, freshwater,
terrestrial, and even aerial environments
GENERAL CHARACTERISTICS

8. Characteristics of Arthropods
Segmented
Jointed appendages
Hard external skeleton
3 parts-head, thorax, abdomen (arachnids
exception)
Exoskeleton-hard, external skeleton made
of chitin
Molting- shed old exoskeleton and secrete
a larger one, very vulnerable after molting

9. •Complete digestive tract (mandible-chewing or
proboscis- sucking) with a dorsal heart and a
ventral nervous system
•Respiration through gills, trachea, book lungs or
body surface
•Sensory organs include antennae and hairs,
simple and compound eye
•Reproduces (mostly sexually), one to several
larval stage

10. •The muscle system is more or less assisted by
hydraulics originated from the blood pressure
created by the heart
•Respiration through gills, trachea, book lungs or
body surface
•With open circulatory system. Haemolymph that
contains haemocyanin, a copper-based oxygen-
carrying protein

11. Body parts
Ganglia-clusters of nerve cells along a
nerve cord
Compound eyes-may facets each with
their own lenses, some have single lenses
and some have both
Spiracles-holes in the exoskeleton that
allow gas exchange (book lungs in
arachnids)
Trachea-chitin lined tubes in spiracles

12. Four SUBPHYLA of Arthropods
Trilobita – thought to be the oldest
arthropods
Chelicerata – two part body and
mouthparts called chelicerae
Crustacea – hard exoskeleton, two pairs
of antennae, mouthparts called
mandibles
Uniramia – contains more species than
all other groups of animals alive today

13. SUBPHYLUM - Trilobites
• CLASS TRILOBITA – Trilobites
SUBPHYLUM CHELICERATA
•CLASS ARACHNIDA – Spiders, Scorpions, Ticks
• CLASS MEROSTOMATA – Horseshoe crabs
• CLASS PYCNOGONIDA – Sea spiders
REPRESENTATIVE ORGANISMS:

14. SUBPHYLUM UNIRAMIA
• CLASS CHILOPODA – Centipedes
•CLASS DIPLOPODA - Millipedes
•CLASS INSECTA – Insects
•Class Branchiopoda – Brine shrimp

15. • CLASS CEPHALOCARIDA – Horseshoe shrimp
•CLASS MAXILLOPODA – Barnacles, and
Fish lice
•CLASS MALACOSTRATA – Lobsters, Crabs,
and Shrimps

16. CLASS CRUSTACEA
Lobsters, Crabs and Shrimps
American
lobster
Homanus
americanus
Blue crab
Callinectes
sapidus

17. CLASS INSECTA
Ants, Beetles and Bugs
ORDER
HYMENOPTERA
Fire ant
Solenopsis
invicta
ORDER
ORTHOPTERA
Migrating locust
Locusta migratoria
ORDER COLEOPTERA
Weevil
Beetle

18. MAJOR PARTS OF AN INSECT

19. Insects that have piercing and sucking
mouthparts are called BUGS while BEETLES are
insects distinguished as those having forewings
modified into hard wing cases that cover and
protect the hind wings and abdomen!

20. CLASS ARACHNIDA
Spiders, Ticks and Scorpions
Wolf spider
Lycosa tarentula

21. The Goliath Bird-
eating tarantula (Theraphosa blondi)
But can grow as much as 1 ft in
diameter!

22. CLASS MEROSTOMATA
Horseshoe crabs

23. CLASS CHILOPODA
Centipedes
Peruvian Giant

24. CLASS DIPLOPODA
Millipedes
Harpaphe haydeniana

25. CLASS TRILOBITA
Trilobites

26. LIFE CYCLES OF
SOME INSECTS

27. LIFE CYCLE OF A DRAGONFLY
(CLASS INSECTA ORDER ODONATA)

28. LIFE CYCLE OF A FRUIT FLY
(CLASS INSECTA ORDER DIPTERA)

29. LIFE CYCLE OF A BUTTERFLY
(CLASS INSECTA ORDER LEPIDOPTERA)
(Larva)
Caterpillar
(Pupa)
Chrysalis

30. LIFE CYCLE OF A GRASSHOPPER
(CLASS INSECTA ORDER ORTHOPTERA)

31. MIMICRY AND CAMOUFLAGE
Mimicry - take on the appearance of (another animal or
plant) in order to deter predators
Camouflage - the natural coloring or form of an animal
which enables it to blend in with its surroundings

32. ECOLOGICAL IMPORTANCE
•Serve as food source for both animals and
humans
•Aid in the propagation of plant species by
means of cross-pollination
•Control the population of some harmful
organisms
•Some act as scavengers or saprotrophs