CURATED READING PATHS
Marine organisms and body plans
Compare eight groups of marine invertebrates using anatomy, movement, photographs and taxonomic references.
Start with visible structures before assigning a name. Follow a group guide to compare similar forms and understand what an image can establish.
Marine life
Comb jellies: eight rows of moving light ↗
Comb jellies swim with eight rows of fused cilia, but the rainbow shimmer in a photograph and a flash of bioluminescence have different causes. Their body forms and feeding structures also vary widely.
Marine life
Hydrozoans: one group, many ways of living ↗
Hydrozoans include attached hydroid polyps, small swimming medusae, and elaborate colonies such as siphonophores. Their varied forms share cnidarian stinging cells, but appearance alone rarely establishes a precise identification.
Marine life
Sea angels and sea butterflies ↗
Sea angels and sea butterflies are pelagic snails whose modified foot helps them swim. Their different adult body forms matter when interpreting shell damage and ocean-acidification research.
Marine life
A siphonophore is a colony with a shared life ↗
A siphonophore is an integrated hydrozoan colony whose connected zooids perform different roles. Its coordinated appearance can resemble one long animal, but colonies vary in form and are not all built alike.
Marine life
True jellyfish: the life behind the bell ↗
A scyphozoan’s familiar swimming bell is one stage in a life cycle that often begins as an attached polyp. Its contractions, feeding structures, and seasonal abundance make sense when viewed as parts of that life history.
Marine life
Tunicates: filter feeders with a chordate connection ↗
Tunicates include attached sea squirts and free-swimming forms such as salps and larvaceans. Their varied adult bodies share a chordate lineage, made especially visible in the larval stage of many tunicates.
Marine life
Bristle worms: many segments, many lifestyles ↗
Polychaetes share a segmented body plan, but their appendages and habitats reveal a wide range of ways to move and feed.
Marine life
Anemones and corals: life as a polyp ↗
Anthozoans live in a polyp form, using a mouth, oral disk, and tentacles without a free-swimming medusa stage.
Field methods
The sea peach is an animal, not a plant ↗
Halocynthia aurantium is an ascidian tunicate: an attached marine animal with a protective tunic and two siphons. Careful field notes distinguish direct observations from a name that still needs evidence.
Research notes
How to map a house made of mucus ↗
Laser imaging can reveal how a giant larvacean’s delicate mucus filters shape water and particle flow, while leaving open questions about where discarded material ultimately goes.