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Laboratory work 1 Theme: Features of the structure of the cephalothorax on the example of the lancelet The purpose of the lesson: To determine the systematic position and study the appearance and internal organs of the lancelet.
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SYSTEMATIC POSITION OF THE OBJECT Phylum Chordata Subphylum Acrania Class Cephalochordata Order Amphioxiformes Family Branchiostomidae Representative Lancelet, Branchiostoma lanceolatum Pallas, 1774
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MATERIAL AND EQUIPMENT For one or two students are needed: 1. Preparation of a whole lancelet lying on its side on a glass slide, coated and colored with carmine. 2. Preparation of a transverse incision of the lancelet in the pharynx area. 3. Preparation of cross section of lancelet in the intestinal region. 4. Tripod magnifier. 5. Microscope.
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THE TASK Consider the appearance of a fixed lancelet, and then under a magnifying glass and microscope - the structure of the systems of its organs. Each student in his album must make the following pictures: 1. Whole lancelet (side view) with organ systems (loupe). 2. A transverse incision of the lancelet in the pharyngeal region (microscope). 3. A transverse incision of the lancelet in the intestine area (microscope).
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