Yesterday afternoon the second group from the Ottawa Catholic Schools district spent much of their time in the lab identifying and classifying different invertebrates, found in the intertidal and sub tidal regions of the bay. They also looked with more depth into the phylum Echinodermata, which includes such things as sea stars, sea urchins and sea cucumbers. They were also given a presentation on the lobster and in the evening a presentation on Whale Identification. The whale talk was in preparation for their trip today to Grand Manan, where they will be whale watching and exploring some of the islands industries and beaches.
Sea star under the microscope. Can you identify the madreporite*?
Sea urchin under the microscope. The primary (larger) spines are on a ball joint allowing them to rotate and move 360 degrees!
*The Madreporite is believed to be part of the sea star water vascular system. This system allows the water to flow into the madreporite, through various canals which causes pressure changes that allow the tube feet of the sea star to grasp and release, thus causing the animal to move.
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