At a Glance

• Difficulty: Intermediate
• Founding: Fully claustral
• Diet: Seeds (granivore) + insect protein
• Temperature: ~80–86°F warm gradient
• Castes: Minors, majors & rare supermajors
• Sting: Minimal

Founding the Colony

Pheidole obtusospinosa founds fully claustrally — seal the queen in a dark test tube with a water reservoir and leave her undisturbed. No feeding is needed until the first workers appear. Once she has a small worker force, growth accelerates fast.

Feeding

A granivore with a serious protein appetite. Keep a seed mix available and offer generous insect protein — fruit flies, small crickets, roaches. Protein is what fuels the big-headed majors, so don't skimp.

Heating & Setup

A warm desert species — aim for 80–86°F over part of the nest with a cooler gradient. Give roomy chambers; as the colony grows it becomes populous and appreciates the space.

The Supermajor Caste — What Makes This Species Special

Most ants have two worker sizes; P. obtusospinosa has a rare third caste. These oversized supermajors use their enormous, plug-shaped heads to physically block the nest entrance against raiders — living doors. It's one of the most remarkable behaviors in the hobby, and watching a mature colony develop them is a real payoff.

Growth & What to Expect

Fast. Like most Pheidole, a settled colony explodes in numbers, first producing majors and, as it matures, the famous supermajors. Steady heat and heavy protein are the keys to getting there.

Ready to start a colony?

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