Mississippi Science MAQ.6.4
The Standard
- MAQ.6
- Students will investigate characteristics of aquatic invertebrates.
Compare and contrast major body plans (e.g., asymmetry, radial, bilateral symmetry, acoelomate, pseudocoelomate, and eucoelomate).
2026 Mississippi College- and Career-Readiness Standards for Science · Invertebrate Consumers
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students compare marine invertebrates by how many ways their bodies can be divided into matching halves. They use cross sections to see whether a body cavity is absent, partly lined by mesoderm, or fully lined by mesoderm.
What Mastery Looks Like
- A student can identify asymmetry in a sponge, radial symmetry in an anemone, and bilateral symmetry in a flatworm. Given cross sections, they can tell a flatworm, roundworm, and segmented worm apart by their body cavities.
Common Misconceptions
- Students may call an anemone bilateral because one cut makes matching halves, missing that several cuts do. They may mistake the gut for a body cavity or think a roundworm's cavity has a complete mesoderm lining.
How to Assess It
- On an exit ticket, have students classify the symmetry of a sponge, anemone, and flatworm, then label the cavity type in cross sections of a flatworm, roundworm, and segmented worm.
Lesson moves
Ways to Teach It
Give pairs top-view paper cutouts of a sponge, anemone, and flatworm; have them test several folds for matching halves.
Ask: Why can an anemone catch prey from many directions while a flatworm has a clear front? Use symmetry to explain.
Run a card sort with cross sections of flatworms, roundworms, and segmented worms; students match each to no cavity, partial lining, or complete lining.
Show a tide-pool photo of an anemone; have students mark directions from which drifting prey could reach its tentacles.
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Printable MAQ.6.4 Worksheet
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Related Standards
- ZOO.10.5
Dissect representative taxa and compare their internal and external anatomy and complexity.
- ZOO.4.6
Dissect representative taxa and compare their internal and external anatomy and complexity.
- ZOO.2.1
Differentiate among asymmetry, radial symmetry, and bilateral symmetry in an animal’s body plan.
- ZOO.4.4
Create a model comparing acoelomate, pseudocoelomate, and eucoelomate body plans of Platyhelminthes, Nematoda, and Annelida.
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