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Marine Bio
Phyla Cnidaria & Ctenophora; coral, anemone, jellyfish, & comb jellies
| Question | Answer |
|---|---|
| Cnidaria definition | The phylum that consists of multicellular organisms. |
| Examples of Cnidaria's | Sea anemones, corals, and jellyfish. |
| Cnidaria characteristics | Radial symmetry, centrally located mouth with tentacles, two basic body forms, cnidocytes, & they lack organs. |
| Radial symmetry | Symmetry around a point that is repeated. |
| Cnidocytes | Specialized stinging cells used for capturing prey |
| They lack what | A true brain |
| Nerve net | Interconnected neurons used to transmit information and respond to physical contact. |
| Cnidarians two body forms | Polyp and Medusa |
| Polyp | A stage in which the cnidarian is sessile, or fixed, in one place. |
| Medusa | A stage in which the cnidarian is bell or umbrella like In shape. |
| Cnidarians two body layers | Epidermis (external) and gastrodermis (lines the gut) |
| Mesoglea | Middle layer that separates the epidermis and gastrodermis |
| What forms the bell of the jellyfish? | Mesoglea |
| Nematocysts | Tiny, stinging structures that are triggered by a mechanical stimulation. |
| What class is Hydrozoans part of? | Hydrozoa |
| Hydrozoans larval stage and adult stage | Larve stage - Medusa. Adult stage - Polyp. |
| Zooids | Polyps with different morphological forms that make up colonial cnidaria. |
| Planular larvae | Hydrozoans produce them through sexual reproduction - Larvae that swim |
| Examples of Hydrozoans | Portuguese Man O' War & Fire Coral |
| What class is Scyphozoans part of? | Schyphozoa |
| What do Scyphozoans consist of? | Larger "true" jelly fish |
| What is the dominant form for Scyphozoans? | Medusa with a rounded bell shape |
| Examples of Scyphozoans | Moon jellies, Pacific Sea Nettle, & Crown Jelly |
| What class is Cubozoans part of? | Cubozoa |
| What do Cubozoans consist of? | Box jellyfish and sea wasps |
| Where are Cubozoans mostly found in? | Australia. |
| What class are Anthozoans part of? | Anthozoa. |
| What form is dominant for Anthozoans? | Polyps. |
| Examples of Anthozoans | Corals, anemones, & sea fans. |
| How many tentacles do Anthozoans have? | They are octocorals which have 8- fold symmetry meaning their tentacles come in a group of 8. |
| Ctenophores | phylum Ctenophora and consists of comb jellies. |
| Ciliary combs | Tentacles which don't sting. |
| Colloblasts | Sticky cells Ctenophores use to capture prey. |
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