Arthropod Groups. David J. Shetlar, Ph.D. The “BugDoc”. The Ohio State University, OARDC & OSU Extension Columbus, OH. © October, 2004, D.J. Shetlar, all rights reserved. What is Entomology?. The study of insects (and their near relatives). What are insects
David J. Shetlar, Ph.D.
The Ohio State University,
OARDC & OSU Extension
© October, 2004, D.J. Shetlar, all rights reserved
The study of insects
(and their near relatives).
What are insects
(and near relatives)?
Insects and their relatives are
(classifying & naming)
Genus & species
Kingdom - Animalae
Phylum - Arthropoda
Class - Hexapoda (=Insecta)
Order - Coleoptera
Family - Scarabaeidae
Genus - Popillia
Genus & species -
The arthropods are divided into two large groups that exist today:
Mite and Tick Body Regions
Blacklegged (deer) tick female
Twospotted spider mites
(many legged arthropods)
(all have one pair of antennae, a head region, and trunk with many pairs of legs, use trachea)
Two pair of legs per visible segment, attached under body.
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.
[one pair of antennae, head & trunk regions, trunk with many pairs of legs]
Garden centipede (Symphyla)
(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)
a terrestrial crustacean