Lab 11 Insects Flashcards
How are insects different from other hexapods
- Insects have external mouth parts
- Their antenna contain a motion sensory tube receptor called Johnston’s organ
- Insects have trachea to do gas exchange
Complete metamorphosis and give an example
The change between stages is dramatic
Example: butterflies
Incomplete metamorphosis and give an example
Changes in the insect between stages are gradual
Ex grasshoppers
Unique traits of Coleoptera
- beetles
- elytra (second pair of wings that covers their flight wings and makes a line on their back)
Lepidoptera
- butterflies and moths
- overlapping scales on wings that let them fly, appears as powder when they fall off
- if they lose too much, they can’t fly
What is the difference between butterflies and moths
They have different antennae. Moths have fuzzy antennae and butterflies are non fuzzy skinny with black dots
Hemiptera
- true bugs
- triangular shield on back
- half wing (clear tips)
Homoptera
- plant and tree hoppers
- wings make a tent over the abdomen
Hymenoptera
- ants, bees, wasps
- constructed waist
Diptera
- flies
- one pair of wings (2 wings total)
- halteres: paddle like structures used for stabilization
Dermaptera
- earwigs
- have cerci used to sense surrounding environment some have been modified to pincers
Orthoptera
- grasshoppers, katydids, and crickets
- ovipositor: used to deposit eggs into the soil
Blattodea
- roaches
- wings overlap across thorax and abdomen
Odonata
- dragonflies and damselflies
- aquatic naiads (larva)
- aerial adults
Tagmata of insects
Head: sensory
Thorax: movement (wings and legs attached here)
Abdomen: reproduction
What is instar
Instar are the immature stages of insects between molts
What are spiracles
Tiny holes along the abdomen that are used for gas exchange they open and close to minimize water loss
What is the ovipositor used for?
It is used to deposit eggs into the soil
What order has halteres
Diptera
What is sexual dimorphism. Know the examples of carpenter bee and Dobson fly
- distinct difference in size or appearance between the sexes
- bees males are yellow and females are black
- Dobson fly males have a larger mouthparts than females
