1. Arthropods

2. Insects and their relatives are ARTHROPODS.
What is Entomology?
The study of insects
(and their near relatives).
What are insects
(and near relatives)?
Insects and their relatives are
ARTHROPODS.

3. Review of Zoological Nomenclature
(classifying & naming)
Taxonomic Categories
KINGDOM
Phylum
Class
Order
Family
Genus
Genus & species

4. Review of Zoological Nomenclature
Taxonomic Categories
Kingdom - Animalae
Phylum - Arthropoda
Class - Insecta
Order - Coleoptera
Family - Scarabaeidae
Genus - Popillia
Genus & species
Popillia japonica Newman

5. Characteristics of the Phylum
Arthropoda
The segmented bodies are arranged into regions, called tagmata (e.g., head, thorax, abdomen).
The paired appendages (e.g., legs, antennae) are jointed.
They posses a chitinous exoskeletion that must be shed during growth.
They have bilateral symmetry.
The nervous system is dorsal (belly) and the circulatory system is open and ventral (back).

6. Arthropod Groups (taxa)
The arthropods are divided into two large groups that exist today:
Chelicerates
and
Mandibulates

7. Chelicerate Arthropod Characters:
Pincer-like mouthparts - chelicerae
NO antennae
Two body regions, usually - cephalothorax & abdomen
Four pairs of legs
Horseshoe crabs and arachnids are only living groups

8. Mandibulate Arthropod Characters:
Mouthparts are mandibles - normally chewing sideways
One or two pairs of antennae
Various body region arrangements - cephalothorax & abdomen / head & trunk / head, thorax & abdomen
Variable leg numbers
Insects, crustaceans & myriapods

9. Orders of Arachnids Scorpions Pseudoscorpions Daddy Long-Legs
Mites & Ticks
Spiders

10. Pseudoscorpion
Tick
(a mite)
Scorpion
Wolf
Spider
Daddy-long-legs

11. Scorpion Anatomy

13. chelicerae
eyes
pedipalp

14. Pseudoscorpion

15. American dog tick male
Blacklegged (deer) tick female

16. American dog tick female laying egg mass (1000-2000 eggs!).

17. Clover mites
Twospotted spider mites
Predatory mite

18. daddy long-legs
cephalothorax
abdomen

19. Spider Anatomy pedipalp chelicera (fang) cephalothorax narrow waist
abdomen

20. Jumping Spider
Abdomen
Cephalothorax
Chelicera (fang)
Pedipalp

21. Wolf spider with egg case
Spitting spider
Orb-weaving spider
Tarantula

22. Black widow with egg case
Brown recluse

23. (many legged arthropods)
Classes of Myriapods
(many legged arthropods)
(all have one pair of antennae, a head region, and trunk with many pairs of legs, use trachea)
Diplopoda - millipedes
Chilopoda - centipedes

24. Myriapods Millipede (Diplopoda)) Centipede (Chilopoda))
[one pair of antennae, head & trunk regions, trunk with many pairs of legs]
Millipede (Diplopoda))
Two pair of legs per visible segment, attached under body.
Centipede (Chilopoda))
Pair of fangs under head, one pair legs per visible segment - attached to side of body.
No fangs, no eyes, legs attached to side of body.

25. Millipede (Diplopoda)
Centipede (Chilopoda)
Garden centipede

26. Classes of Crustacea Sowbugs or pillbugs Crabs, lobster, shrimp
mostly marine, fresh water, a few terrestrial
all have two pair of antennae
five or more pairs of legs
segmented abdominal appendages
head & trunk or cephalothorax & abdomen body arrangement
have gills
Sowbugs or pillbugs
Crabs, lobster, shrimp