Phyla Cnidaria and Ctenophora, Basic Animal Development ...

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Phyla Cnidaria and Ctenophora, Basic Animal Development & Introduction to Nervous Systems 5.12 Lab #5 - Biological Sciences 102 – Animal Biology Discharge of nematocysts involves the following events: 1. molecules released from prey may sensitize the cnidocytes, but tactile stimulation causes the nematocysts to discharge 2. discharge is due to tensional forces created by a very high osmotic pressure within the nematocyst 3. when triggered the high osmotic pressure causes water to rush in to the capsule. 3. the build of water (increased hydrostatic pressure) forces the filament out and it turns inside out at the same time 4. the barbs are then exposed and, if present, poison is injected into the prey Nematocysts of most cnidarians are not harmful to humans, but the stings of Physalia and some true jellies are painful and can be dangerous – particularly if the individual is allergic to the organic poison. The instructor will remove the tip of a tentacle from Corynactis californica or similar species and prepare a slide by squashing the tip under a cover slip. Label the undischarged and sketch a discharged nematocyst below. UNDISCHARGED NEMATOCYST DISCHARGED NEMATOCYST Subclass Ceriantipatharia Order Ceriantharia (tube anemones) Observe the specimens and/or diagrams of the following species. Record the descriptive information requested at the end of the lab for these species. The available ceriantharian such as Pachycerianthus fimbriatus Subclass Octocorallia Under a dissecting scope, observe the polyp morphology of Lophogorgia chilensis or Renilla kollikeri to identify the unique features of an octocorallian polyp. Record the descriptive information requested at the end of the lab for these species.
Phyla Cnidaria and Ctenophora, Basic Animal Development & Introduction to Nervous Systems 5.13 Lab #5 - Biological Sciences 102 – Animal Biology For the live specimens available for observation in the lab, record the requested information. Be sure to include descriptions of any live members of the Phylum Ctenophora if they are available. Phylum Cnidaria Class Hydrozoa Scientific name: Aglaophenia latirostris Common name: General dimensions of specimen: Color of specimen: Life stage present (observed): Solitary or colonial: Benthic, planktonic or pneustonic: Unique structures or features: Draw a simple sketch to remind you of the basic structure of this species and any unique characteristics observed. Notes & observations to help you remember and distinguish this group/species:
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