Bio Lab Wksht & HW Questions 90

Bio Lab Wksht & HW Questions 90 - Examine the...

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85 3. Now examine the thorax. It consists of three segments each bearing a pair of jointed legs: an anterior prothorax (covered dorsally and laterally by the saddle-like pronotum ), bearing a pair of walking legs, called the prothoracic legs a middle mesothorax , bearing a second pair of walking legs, the mesothoracic legs and a posterior metathorax bearing the large metathoracic legs specialized for junping locate the 2 pairs of wings; the outermost mesothoracic wings are leathery; beneath them are the membranous metathoracic wings . 4. The relatively unspecialized abdomen consists of 11 segments. Laterally, the first abdominal segment bears the oval tympanum , which may be partially obscured by the metathoracic leg. What function does the tympanum have?
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Unformatted text preview: Examine the anteroventral corners of segments 2-9 and find the minute respiratory openings, the spiracles . 5. The terminal segments of the abdomen show some fusion. They are modified to form the external genitalia . In males, the posterior tip of the abdomen is rounded ventrally, and bears a pair of small, dark, triangular dorsolateral spurs, the cerci , which have a tactile sensory function. In females, cerci also are present, but the most conspicuous feature of the posterior abdomen in females is the ovipositor , which consists of 4 large conical prongs. What is the function of the ovipositor? Using the information above label the following diagram, depicting a female grasshopper. Figure 2. Grasshopper external features (Class Insecta)....
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