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Note: All ants for sale have a legal shipping range. Check the map to see if you're eligible to buy these ants!

Mountain Big-Headed Ants (P. obtusospinosa)

Mountain Big-Headed Ants (P. obtusospinosa)

Pheidole obtusospinosa is a rare, beautiful species of trimorphic Pheidole from the Southwest. This is one of few species in the world to be trimorphic, having a true supermajor caste!



  • Species Info

    General: Pheidole obtusospinosa is a medium-large species of Pheidole occurring in the southwest US and northern Mexico. This species is one of few in the world that is trimorphic, having workers, majors, and supermajors. They grow VERY quickly with heating and feeding.


    Diet: These ants have a generalist diet. They love liquid sugars and protein, such as crickets, fruit flies, mealworms, etc. Simply feed them LOTS, and they will grow.


    Temperature: These ants require heating. Their nest should ideally be between 85-92, but provide a heating gradient if possible. Pheidole obtusospinosa will not grow at room temperature. 


    Diapause: Pheidole obtusospinosa will not need a diapause period. Do not cool them down anywhere near freezing temperatures. They can continue to grow, even through winter.


    Growth: Brood development takes 3-7 weeks depending on heating and caste. The majors tend to take longer to develop. Colonies can be grown to thousands of workers within the first year, given lots of food and heating. 


    Queen size: 7-8mm

    Worker size: 2.5-3.5mm

    Major size: 4-6mm

    Supermajor size: 6-8mm

  • Live Arrival Guaranteed

    If ants arrive in bad condition, contact us for help. Live arrival is guaranteed.


    Shipping happens from Monday-Wednesday. During the winter, shipping may cost more due to the need of a heat pack. 

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