Pheidole obtusospinosaSpecies Introduction
Claustral. Single queen, sealed founding chamber, no outside food needed for the first generation.
Native to the Southwestern US. One of the largest Pheidole species found in the US, Pheidole obtusospinosa is one of the few Pheidole species with minor workers, major workers, and super majors. The super majors are believed to be used in colony defense, specifically against Neivamyrmex army ants. Colonies and founding queens are commonly found under rocks, and will readily defend their nest. Distinct trimorphic worker caste: minors handle daily tasks while majors and super majors with disproportionate heads help with food-storage, colony defense, and processing food items. These ants are very aggressive and will readily swarm prey items!
Pheidole obtusospinosa is a fast-growing species that can typically reach colony maturity in the first year. Capable of reaching thousands of individuals within the first year, these ants are quite exciting for any ant-keeper that enjoys fast-growing ants. Unlike most trimorphic Pheidole, Pheidole obtusospinosa are mostly uninterested in seeds, their diet consists primarily of insect prey, carrion, and liquid carbohydrates. Colonies get super majors relatively early on, typically before the thousands. These ants can be quite sensitive straight out of founding, that's when most people mess them up. Provide lots of protein, and a constant source of liquid carbohydrates, and they will thrive.
Formicarium
Substrate or hydrostone nests work fine. A clear nest with thin chambers shows off the major/minor caste contrast. The Substratum Sand Ant Nest is recommended for these ants. Be prepared for a nest expansion as these ants grow fast. A secure nest and a fluon barrier for the outworld is recommended due to large colony sizes, and aggressive behavior.
Water & Humidity
Humid. Pheidole obtusospinosa are ground-nesting, but seem to be more tolerant to lower humidity than most.
Recommended to use TrapJaw Labs PVA sponges during founding for improved success rates and more nanitics.
Keep a liquid feeder with water (distilled, purified, or spring) in the foraging area at all times.
Carbohydrates
Carbohydrates are highly recommended for Pheidole obtusospinosa. Sugar feeder in the outworld 24/7.
Occasional small honey drop in the outworld is fine.
We recommend providing a liquid feeder with sugar-water or Ant Nectar Mix.
Protein
Extremely protein-loving. We suggest feeding protein 2–3 times a week. The more frequent the better.
TrapJaw Labs feeds our P. obtusospinosa colonies with pre-killed D. melanogaster and D. hydei fruit flies as well as pre-killed and cut mealworms. These ants will take most feeder insects.
Two to three times per week. Increase amounts to scale with brood development.
Maintenance
Week 1: Dark, warm, gently humid, and undisturbed. No food yet.
Weeks 2–4: First workers appear. Start protein 2–3×/week. You may not see majors until the colony is larger.
Months 2+: Rapidly growing colony. Majors begin appearing, super majors following suit in the coming months. They'll handle a lot of protein and grow accordingly.
Diapause is not required for this species.
Care Summary
- Protein 2–3×/week (more is better)
- Sugar via feeder 24/7
- Moderate humidity
- Gradient 75–92°F
- Wait for the majors to arrive