Aphaenogaster tennesseensis

Aphaenogaster tennesseensis - "Tennessee Thread-waisted Ant"

Aphaenogaster tennesseensis is a medium-to-large woodland ant from eastern North America. Workers measure 4.5 to 7.2 mm and are dark reddish-brown with a distinctive lack of erect hairs on their bodies, giving them a smooth, shiny appearance compared to other Aphaenogaster ^[1][2]. Their most striking feature is the pair of long, curved propodeal spines that point backward toward the gaster ^[3]. Unlike most ants, this species is a temporary social parasite, queens cannot found colonies alone and must invade nests of other Aphaenogaster species like A. fulva, A. rudis, or A. picea to start their colonies ^[4][5]. They nest in rotting wood, standing dead trees, and stumps in mesic woodlands from Quebec to Florida and west to Oklahoma ^[1][6].

Quick Summary

• Difficulty: Expert
• Origin & Habitat: Eastern North America (Nearctic), found in mesic woodlands, oak-hickory forests, and semi-open areas from Quebec to Florida and west to Minnesota and Oklahoma ^[1][4][6].
• Colony Type: Monogyne, single queen temporary social parasite. Colonies contain one fertile queen and can reach several hundred to several thousand workers ^[7][6][4].
  • Colony: Monogyne
  • Queen: Temporary parasitic
• Size & Growth:
  • Queen: Small and smooth compared to other Aphaenogaster, with distinctive blunt-tipped propodeal spines ^[1][2].
  • Worker: 4.5-7.2 mm ^[1][2].
  • Colony: Several hundred to several thousand workers, colonies tend to be large and populous compared to other local Aphaenogaster species ^[6][4].
  • Growth: Moderate
  • Development: Unknown, development depends on host colony availability and seasonal conditions. (As a temporary parasite, queens do not raise the first generation alone, timeline depends on host worker adoption and seasonal temperature.)
• Antkeeping:
  • Temperature: Temperate species. Keep at 20-25°C during active season (spring through late summer). Provide hibernation at 5-10°C for 3-4 months during winter.
  • Humidity: Moderate to high humidity (60-80%). Nest substrate should mimic rotting wood conditions, damp but not waterlogged, with moisture gradients available ^[6][1].
  • Diapause: Yes, required for healthy colony cycles. Hibernation likely occurs November through February based on temperate range and late summer alate production ^[1][6].
  • Nesting: Naturalistic wood setups with rotting wood, stumps, or Y-tong nests with wood-like chambers. They need wood to chew and will plug cracks with wood granules ^[6][1].
• Behavior: Workers forage on tree trunks, logs, and the ground, collecting small arthropods and seeds ^[1]. They show aggressive defense behavior, bending their abdomen beneath the thorax and projecting their sting when threatened ^[7]. Colonies are active during summer months with alates present in nests from July through August ^[1][6].
• Common Issues: cannot be founded by a lone queen, you must provide a host colony of Aphaenogaster fulva, rudis, or picea for the queen to parasitize., host colony rejection or queen death if host workers are too aggressive or queen is not accepted., wood nesting requirements mean standard plaster nests may be rejected, they need wood fibers to manipulate., hibernation is required for long-term colony health, skipping winter rest leads to colony decline., aggressive defense makes colony maintenance challenging, they will sting when disturbed.

Temporary Parasitism and Colony Founding

You cannot start Aphaenogaster tennesseensis from a single queen in a test tube. This species is a temporary social parasite, meaning the queen must enter an established colony of a different ant species and take it over ^[4][5]. In nature, queens invade nests of Aphaenogaster fulva, A. rudis, or A. picea ^[4][2]. The host workers groom the invading queen and eventually accept her as their own ^[5]. She then uses the host workers to raise her first brood of workers. As her own workers mature and the host workers die off, the colony transitions to consisting entirely of her offspring. For captive founding, you must introduce a tennesseensis queen into a healthy host colony of the appropriate species. This requires experience with both species and careful monitoring to ensure the queen is accepted rather than killed.

Nest Preferences and Setup

In the wild, Aphaenogaster tennesseensis nests in rotting logs, stumps, standing dead trees, and the rotting heartwood of living oaks ^[6][1][2]. They prefer wood in early to mid stages of decomposition, hard enough to maintain structure but soft enough to excavate. Workers actively chew wood and use the granules to plug cracks and modify their nest chambers ^[6]. Brood chambers follow the wood grain and can be quite large, up to 6 inches long in natural logs ^[6]. In captivity, provide a naturalistic setup with rotting wood or a Y-tong nest that mimics wood cavities. Include pieces of hardwood or cork bark they can chew. The nest should offer tight spaces and galleries rather than open chambers.

Feeding and Diet

These ants are generalist foragers. Workers hunt small arthropods on the ground and on tree trunks ^[1]. They also collect seeds with elaiosomes (fatty attachments), particularly from plants like Carex laxiculmis ^[1]. Additionally, they forage on polypore fungi and accept fruit baits in the field ^[1]. In captivity, offer a varied diet including small insects (fruit flies, pinhead crickets, mealworms), sugar water or honey, and seeds such as dandelion or poppy seeds. They may also appreciate small pieces of mushroom or fungus. Remove uneaten protein within 24-48 hours to prevent mold in their wood nest environment.

Temperature and Seasonal Care

As a temperate species from eastern North America, Aphaenogaster tennesseensis requires seasonal temperature cycles. Keep colonies at 20-25°C during the active season (March through October). Alates develop in nests from July through August, with flights likely occurring in late summer ^[1][6]. For winter care, provide a hibernation period of 3-4 months at 5-10°C. Gradually reduce temperature in late autumn and maintain cooler conditions until spring. Hibernation is essential for the queen's health and proper brood development cycles.

Behavior and Defense

Aphaenogaster tennesseensis shows distinctive defensive behavior. When threatened, workers bend their abdomen beneath their thorax, raise their legs, and project their sting upward to reach an attacker's body ^[7]. They are capable of stinging and will use this defense readily when their nest is disturbed. Workers are active foragers, traveling up tree trunks and across the ground in search of food ^[1]. They are also wood modifiers, you will see them carrying wood granules to plug small openings in their nest, a behavior that helps maintain humidity and security ^[6].

Frequently Asked Questions

References