SpreadingBoard摘要.pptVIP

Spreading Board Mounting butterflies and moths is a special technique that requires a spreading board to do an attractive job. The spreading board is usually made of soft pine with a piece of balsa or cork underneath the center groove to receive insect pins. An acceptable spreading board can be made from balsa wood or cardboard strips, 2 heavy paper clasps, four corks and four common pins. Spreading boards can also be ordered from biological supply houses and hobby stores. Spreading Board Pinning Insects When working with your collection, be sure to follow these instructions precisely and routinely. Improperly pinned insects in your collection will be discounted. The rationale and main goal in developing and using proper procedures in pinning insects is to effectively expose and display critical details of insect structure -- the taxonomic characters which are used by insect classification experts (taxonomists) to key and identify insects. The proper way to pin an insect depends on the type of insect that you have collected. Remember that soft-bodied insects such as caterpillars, mayflies, silverfish and some others cannot be pinned. The following diagram illustrates the proper way to pin various orders of insects. Note that the pin is usually just slightly to the right of the midline of the insect. Specimens should also be level and squarely mounted on the pin as shown. The use of a pinning block will help in obtaining proper height and positioning. First, place the pin in the insect thorax in the proper position on the top step of the pinning block, pushing it in so that the top of the insect is quite close to the pin head. Then, remove the pin from the top step, reverse it and place the head of the pin in the lowest step of the pinning block. Push it down as far as it will go. This will result in positioning each insect about one-fourth inch from the pin head. The middle step on the block is to position the collection label. The lowest step is use