Pheidole adrianoi Species Introduction
Claustral. Single queen, sealed founding chamber, no outside food needed for the first generation. The main nuptial flights occur in July and August.
Native to central and northern Florida, west to the panhandle, with records extending into Georgia and Alabama. A specialist of white-sand gaps in pine-oak forest and Florida scrub, where the nest entrance sits in a small crater of excavated sand and drops through a tunnel only 1 to 2mm wide to a main chamber 30 to 40cm down. Mature colonies stay small, around 60 majors and a few hundred minors. Both castes forage strictly by day, and unusually for the genus, the majors leave the nest and help carry food back. Most remarkable is the nest itself: colonies line their chambers with the black sclerotia of an ectomycorrhizal fungus associated with longleaf pine, and the sprouting mycelia bind the loose sand into stable walls.
Genuinely tiny and genuinely charming. Minor workers barely exceed 1mm and look like moving specks, while the majors reach about 2.5mm and are reddish brown against the much darker minors. Colonies stay small by Pheidole standards, so they will not outgrow a modest setup the way most of the genus does. Feed seeds first and insects second, and keep the barrier honest, because ants this small find any gap.
Formicarium
Substrate nests suit them best, since these are sand-nesting ants that dig a deep vertical shaft in the wild. The Substratum Sand Ant Nest is a good match. Thin chambers show off the contrast between the dark minors and the larger reddish majors. A secure nest and a fluon barrier are essential for ants this small, though the colony will never demand a large setup.
Water & Humidity
Moderately humid with a strong gradient. In the wild they nest in dry white sand at the surface but keep their main chamber 30 to 40cm down where conditions stay damp. Replicate that by keeping one end of the nest moist and leaving a drier area where they can store seeds.
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. It is recommended to use the TJL Liquid Feeder for these tiny ants as the mesh prevents accidental drowning.
Carbohydrates
Carbohydrates are a minor part of their diet but still worth providing. A sugar-water feeder in the outworld is readily accepted.
Occasional small honey drop in the outworld is fine.
It is recommended to use the TJL Liquid Feeder for these tiny ants as the mesh prevents accidental drowning.
Protein
Insect protein supplements the seed diet rather than replacing it. In the wild they scavenge small dead arthropods. We suggest offering protein once or twice a week.
TrapJaw Labs feeds our P. adrianoi colonies with pre-killed D. melanogaster and D. hydei fruit flies. Given how small these ants are, cut items down or stick to small feeders so nothing goes to waste.
One to two times per week. Increase amounts to scale with brood development.
Seeds
Seeds are the main component of their diet. Offer them regularly and expect the colony to store what it does not immediately process in the drier chambers. If workers stop accepting seeds, the granaries are likely full, and you can slow down until they work through the stock.
This species is small and prefers small seeds that are easy for them to handle. The TJL Seed Mix is a good place to start if unsure of what kind to offer.
Seeds can be stored in a cool, dry place or in a freezer.
Once per week
Maintenance
Week 1: Dark, warm, gently humid, and undisturbed. No food yet.
Weeks 2–4: First workers appear. Begin offering small seeds and a little protein once or twice a week. Majors take longer to show up, and early growth is slow, which is normal given how small the mature colony ends up being.
Months 2+: Steady rather than explosive growth. Majors become a regular part of the worker force and will join the minors out in the foraging area, which is unusual for the genus. Keep seeds available and maintain the humidity gradient. This species will not outgrow its nest the way most Pheidole do.
Diapause is not required for this species, though activity often slows over winter. Their range covers central and northern Florida, where winters are mild.
Care Summary
- Seeds are the main diet, offered weekly
- Protein once or twice a week
- Humidity gradient: damp end, dry end for seed storage
- Gradient 75–88°F
- Small mature colony, roughly 60 majors and a few hundred minors
- Very tiny ants, keep the fluon barrier fresh