Compare cnidarians and ctenophores give five ways in

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Compare cnidarians and ctenophores, give five ways in which they are similar and five ways in which they are different Similar 1. Neither have a respiratory system or coelomic cavity 2. Both have statocysts to assist in balance and equilibrium 3. Extensible tentacles 4. Oral and aboral ends, but no definitive head 5. Extracellular digestion Different 1. Cnidarians have stinging cnidocytes for feeding while Ctenophores have colloblasts which are sticky cells used to capture prey. 2. Cnidarians can be marine or freshwater, while all ctenophores are marine 3. Cnidarians have an incomplete called a gastrovascular cavity, while ctenophores have a complete gut 4. Cnidarians have a nerve net, whereas ctenophores have a nervous system made up of a subepidermal plexus 5. Cnidarians have muscle contractions via epitheliomuscular cells, while ctenophores use muscle fibers What characteristics of phylum Cnidaria are most important in distinguishing it from other phyla? What type of larval form do they have? Cnidocytes - Modified interstitial cells that hold the nematocysts (stinger) Radial polyp form Planula larva - free swimming, ciliated flat oval that is diploblastic Mouth surrounded by solid tentacles Name and distinguish the taxonomic classes in phylum Cnidaria Hydrozoa - Colonial jellies; velum in medusa; medusae produced by lateral budding Scyphozoa - Bell/cup jellies; strobilation - asexual reproduction via division of the body into segments Cubozoa - Box jellies; boxlike medusa; four evenly spaced tentacle clusters; complex, well developed eyes
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  • Fall '15
  • Zoology, Cnidaria, Body cavity, Libby Hymen, Shistosomiasis- Blood Fluke

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