Tapinoma sessile

The *Tapinoma sessile* is a small ant species with many common names. People often call them odorous house ants, sugar ants, stink ants, or coconut ants. They are found throughout North America, from southern Canada to northern Mexico. These ants are known for being highly adaptable to different environments. They can live in many habitats, including inside human homes. They are considered common household pests because they are drawn to sweets and water.

These ants belong to a group of insects called eusocial organisms. Eusociality means they have a reproductive division of labor. They also engage in cooperative care of their young. Multiple generations of ants live together at the same time. *T. sessile* colonies are also polydomous, meaning they consist of multiple nests. They are also polygynous, which means a single colony contains multiple reproducing queens. This structure allows the colony to grow and manage resources effectively.

The physical structure of *T. sessile* is unique among small, dark ants. Their bodies range in color from brown to black. They are quite small, measuring between 1.5 and 3.2 mm in length. The scientific name *sessile* comes from the word for "sitting." This refers to how the gaster sits directly on top of the petiole. The petiole is a small part of the abdomen. Because of this shape, the gaster points downward. This also means the anal pore opens toward the abdomen instead of away from it.

*T. sessile* uses a smart method called dispersed central-place foraging. In a polydomous colony, food sources might be far from the main nests. Instead of carrying food long distances, the ants move workers, queens, and brood closer to the food. This reduces the effort needed for transport. They also share food through trophallaxis. This is a process where one ant regurgitates food for another. Researchers have used proteins and enzymes to track how sucrose moves through this system. They found that while food spreads, workers often keep most of the sucrose.

The life cycle of the ant follows specific stages. Queens lay eggs that incubate for 11 to 26 days. After hatching, the larval stage lasts between 13 and 29 days. The pre-pupal and pupal stages last between 10 and 24 days. Lifespans vary greatly depending on the role of the ant. Queens live at least 8 months and likely much longer. Workers live for at least a few months. Males have the shortest lifespan, living only about one week.

Scientists have discovered that these ants may be able to clone themselves. Researcher Marcello Ponzo conducted a notable experiment to test this. He captured a colony of seven queens and about 3,000 to 4,000 workers. He kept them in a controlled environment with a nutritious diet. In almost two months, the number of queens grew from seven to ten. This provided strong evidence for the theory of cloning in this species. This ability helps the colony expand its reproductive power.

*T. sessile* is a very tough species that survives through many conditions. They are highly tolerant of both heat and cold. Some queens can survive without food or water for over two months. They also show high resilience to injury. Some workers continue working even when injured. In terms of competition, they are considered a subordinate species. They prefer using chemical secretions over biting or fighting. When they encounter dominant ants, they often leave the food to avoid conflict. However, they are excellent at exploiting resources quickly to survive.