A pooter, formally known as an aspirator, is a tool used in entomology for collecting very small arthropods. This manually operated device allows researchers to capture delicate specimens without causing damage that might occur if using hands or forceps. Its purpose is to safely transfer minute insects, arachnids, or other invertebrates from their environment into a collection chamber for observation or study.
Design and Function of the Device
The pooter operates using negative air pressure created by the user’s breath. It consists of a collection vessel and two tubes. The vessel is typically a small, transparent, airtight container, such as a jar, which temporarily holds the captured organisms. Two holes in the lid accommodate the separate pieces of tubing.
One tube is the intake or nozzle tube, positioned over the target specimen to direct it into the chamber. The second tube, the suction tube, connects to the user’s mouth to generate the vacuum. A fine mesh or filter is positioned across the end of the suction tube inside the vessel. This mesh acts as a barrier, preventing the accidental inhalation of the insect or debris, ensuring user safety. The user inhales through the suction tube, drawing air rapidly through the intake tube, which pulls the organism into the collection chamber.
Proper Use and Collection Context
The pooter is useful for collecting organisms in confined habitats where large gear, such as a sweep net, would be impractical. Researchers use this apparatus to sample small invertebrates inhabiting leaf litter, soil surfaces, or the crevices of bark and rocks. Organisms like springtails, small ants, and minute beetles are suited for this technique due to their size and fragility.
To use the device, the collector places the open end of the intake tube next to the target specimen and applies a quick, gentle inhalation through the mouthpiece. This action creates a controlled burst of suction, drawing the organism safely into the jar without excessive force. This method is superior to mechanical tools for preserving the specimen’s antennae, legs, and delicate body structures. After collection, the specimen remains contained until it can be transferred to a permanent vial or released after observation.