INSECT MOUTHPART LAB Insect Classification Kingdom Animalia Phylum

INSECT MOUTHPART LAB

Insect Classification • Kingdom – Animalia • Phylum – Arthropoda • Class – Hexapoda (Insects)

Characteristics of Arthropods • They have an exoskeleton. • The appendages are jointed. • The hard outer covering • The body is formed of a supports the muscles. number of segments.

Characteristics of Insects Three Main Body Parts

Head • One pair of antennae. – tactile organs • sense of touch – olfactory organs • sense of smell

Thorax • Three pairs of legs. – The thorax has three segments. – Each segment has one pair of legs. Note: Some larvae have leglike appendages on the abdomen. • Often one or two pairs of wings. – The wings are borne by the second and/or third of the thoracic segments. Note: Some insects are wingless.

Abdomen • The gonopore (genital opening) is at the posterior end of the abdomen. • No appendages used for moving on the abdomen of adults (except in a few primitive insects). • Sometimes there are some appendages at the end of the abdomen.

Insect Mouthparts Siphoning/Proboscis Ex. butterfly Sponging/Lapping Ex. housefly

Piercing/Sucking Ex. Mosquito Chewing Ex. caterpillars None Ex. mayfly

Mouthparts Animation http: //www. cals. ncsu. edu/course/ent 4 25/library/labs/external_anatomy/anat omy_mouthparts. html

The Scientific Method 1. Problem/Question 2. Research 3. Hypothesis 4. Experiment 5. Conclusion 6. Report Results

Problem / Question • Which insect mouthpart absorbs the largest volume of liquid in a given period of time; siphoning, piercing/sucking, or lapping?

Hypothesis Which mouthpart do you think will absorb the most liquid in 30 seconds? • Sample: The Siphoning mouthpart will absorb the most liquid in 30 seconds. Siphoning is a lot like using a straw and liquid can be obtained quickly using this method. • DO NOT START A HYPOTHESIS WITH. . . “I think”, “I predict” or “My hypothesis is”!

The Experiment • Independent Variable: Type of mouthpart • Dependent Variable: Volume of liquid • Constants: What was kept consistent/same? – List at least 5 factors. • Control Group: N/A • Experimental Group: Mouthpart types (3)

Other Experimental Factors • Materials – How much? Use metric units. • Procedure – List numerically. Be detailed. • Results: Data Table – Used to organize data. • Results: Graph – Used to visualize and analyze data. – Bar/column graph, line graph or pie chart

Data Collection Data Table: Volume of liquid absorbed in 30 seconds. Lab Group 1 2 3 4 5 6 Siphoning (ml) Piercing (ml) Sponging (ml)

Data Analysis (Sample Data Table) Siphoning (m. L) Piercing (m. L) Sponging (m. L) Individual Average 12 8 28 Period Average 14 11 31 Team Average 9 10 27

Data Analysis (Sample Graph)

Analysis & Conclusion • Make a statement revealing whether the data collected provided support for or against the hypothesis. • Explain the data collected including specific numerical or observational data from the experiment. • Provide a reasonable explanation for the data and attempt to make connections based on the data collected. • What future experiments could be done based on the data collected or how could the experiment be extended to collect more data?