{"id":235,"date":"2022-04-13T19:18:09","date_gmt":"2022-04-13T23:18:09","guid":{"rendered":"https:\/\/pressbooks.bccampus.ca\/unbcbiol322\/?post_type=chapter&p=235"},"modified":"2022-04-16T19:30:18","modified_gmt":"2022-04-16T23:30:18","slug":"insect-anatomy-the-abdomen","status":"publish","type":"chapter","link":"https:\/\/pressbooks.bccampus.ca\/unbcbiol322\/chapter\/insect-anatomy-the-abdomen\/","title":{"raw":"Insect Anatomy - The Abdomen","rendered":"Insect Anatomy – The Abdomen"},"content":{"raw":"Abdomen<\/strong>\r\n\r\nThe abdomen includes all of the body segments after the metathorax.\r\n\r\nThere are no jointed appendages (legs) or wings attached to the abdomen.\r\n\r\n\"\"\r\n\r\nJust above and behind the hind leg of the grasshopper is the tympanum. It consists of a membrane stretched across an opening, which detects vibrations. Grasshoppers use sound in courtship, and territorial displays. The tympanum acts as an \u201cear\u201d to detect those frequencies.\r\n\r\nThe tympanum will have different sizes, shapes, and locations in different insects.\r\n\r\n\"\"\r\n\r\nAlong the sides of the abdomen, just above the sutures between the tergites and the sternites, you will see one tiny hole per segment. These are the spiracles, or openings of the respiratory system.\r\n\r\nYou may also be able to see some spiracles on the thorax of some insects.\r\n\r\n\"\"\r\n\r\n \r\n\r\nAt the tip of the abdomen, there are two small \u201cflaps\u201d, called cerci. The function, shape, and size of the cerci vary considerably in different insects.\r\n\r\n\"\"\r\n\r\n \r\n\r\nHere are photos of the genitalia of both sexes of grasshoppers, on the last abdominal segment. Which sex do you think is which? [The male grasshopper is on the left, and the female is on the right.]\r\n\r\nThe aedeagus (mostly internal) is used to transfer sperm to the female \u00e0 the ovipositor, literally the \u201cegg positioner\u201d, is used to bury the eggs in hard-packed soil (in grasshoppers).\r\n\r\nBoth male and female genitalia can look quite different in various insects. They are often important for identifying insects to species.\r\n\r\n\"\"","rendered":"

Abdomen<\/strong><\/p>\n

The abdomen includes all of the body segments after the metathorax.<\/p>\n

There are no jointed appendages (legs) or wings attached to the abdomen.<\/p>\n

\"\"<\/p>\n

Just above and behind the hind leg of the grasshopper is the tympanum. It consists of a membrane stretched across an opening, which detects vibrations. Grasshoppers use sound in courtship, and territorial displays. The tympanum acts as an \u201cear\u201d to detect those frequencies.<\/p>\n

The tympanum will have different sizes, shapes, and locations in different insects.<\/p>\n

\"\"<\/p>\n

Along the sides of the abdomen, just above the sutures between the tergites and the sternites, you will see one tiny hole per segment. These are the spiracles, or openings of the respiratory system.<\/p>\n

You may also be able to see some spiracles on the thorax of some insects.<\/p>\n

\"\"<\/p>\n

 <\/p>\n

At the tip of the abdomen, there are two small \u201cflaps\u201d, called cerci. The function, shape, and size of the cerci vary considerably in different insects.<\/p>\n

\"\"<\/p>\n

 <\/p>\n

Here are photos of the genitalia of both sexes of grasshoppers, on the last abdominal segment. Which sex do you think is which? [The male grasshopper is on the left, and the female is on the right.]<\/p>\n

The aedeagus (mostly internal) is used to transfer sperm to the female \u00e0 the ovipositor, literally the \u201cegg positioner\u201d, is used to bury the eggs in hard-packed soil (in grasshoppers).<\/p>\n

Both male and female genitalia can look quite different in various insects. They are often important for identifying insects to species.<\/p>\n

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