Classifyig arthropods

Classifying Arthropods Worksheet

Name: Date:

Fill out the following table with data from the lab exercise:

Table I: Record the results of your observations of the external anatomical characteristics of the selected arthropods and their classification. Body Sections (1,2,3 or >3) Walking Legs (6,8 or >8) Other appendages (Y/N) Antennae (0,2,4) Claw Present (Y/N) Jaw Present (Y/N) Class Common Name
Specimen 1 3 6 N 2 N Y Insecta Stage Beetle
Specimen 2 2 8 Y 0 N N Arachnida Whipscorpion
Specimen 3 2 >8 N 4 Y Y Crustacea Beach Hopper
Specimen 4 2 8 Y 0 N N Arachnida Desert Tarantula

Questions:

1. How do Arachnids differ from other Arthropods?
Arachnids have no wings or antennae. They also all have 8 legs and do not have claws.

2. You have caught an organism in midair with a butterfly net. To which class does it most likely belong?
Insecta

3. You have found an organism that you believe is an Arthropod living in a saltwater tide pool. To which class does it most likely belong?
Crustacea

4. You have located an organism that lacks antennae crawling along the floor of a jungle. To which class does it most likely belong?
Arachnida

5. You have located an organism crawling along the sand near the edge of a body of water and it appears to have claws. Based upon this information, to which class does it belong?
Crustacea

Classifying Arthropods Worksheet

Name: Date:

Fill out the following table with data from the lab exercise:

Table I: Record the results of your observations of the external anatomical characteristics of the selected arthropods and their classification. Body Sections (1,2,3 or >3) Walking Legs (6,8 or >8) Other appendages (Y/N) Antennae (0,2,4) Claw Present (Y/N) Jaw Present (Y/N) Class Common Name
Specimen 1 3 6 N 2 N Y Insecta Stage Beetle
Specimen 2 2 8 Y 0 N N Arachnida Whipscorpion
Specimen 3 2 >8 N 4 Y Y Crustacea Beach Hopper
Specimen 4 2 8 Y 0 N N