Pheidole jeannei

Pheidole jeannei

Pheidole jeannei is a small Neotropical ant species native to the Amazon basin, found in Brazil (Pará, Maranhão) and French Guiana. The species belongs to the gertrudae group and was described by Wilson in 2003. Majors are approximately 1.12mm in head width with a medium brown coloration and contrasting yellowish-brown appendages, while minors are darker at 0.56mm head width. This species is known only from lowland rainforest floor collections, making it a true Amazonian species. The major workers lack propodeal spines but feature distinctive rugoreticulum on the head, which helps distinguish them from related species in the group.

Quick Summary

• Difficulty: Unknown, insufficient captive data
• Origin & Habitat: Amazon basin in Brazil (Pará, Maranhão) and French Guiana, lowland rainforest floor ^[1]
• Colony Type: Likely monogyne (single queen) based on typical Pheidole patterns, but colony structure is unconfirmed for this species
  • Colony: Monogyne
  • Founding: Claustral
• Size & Growth:
  • Queen: Undescribed in original description, estimated 5-7mm based on genus
  • Worker: Major: 1.12mm HW, Minor: 0.56mm HW ^[1]
  • Colony: Unknown, no colony size data available
  • Growth: Unknown, estimated moderate based on typical Pheidole development
  • Development: Unknown, likely 6-10 weeks based on related tropical Pheidole species (No specific development data exists for this species. Estimates based on genus-level patterns for lowland tropical ants.)
• Antkeeping:
  • Temperature: Aim for 24-28°C, warm tropical conditions
  • Humidity: Keep substrate consistently moist but not waterlogged, rainforest floor species
  • Diapause: Unlikely, Amazonian species adapted to year-round warm conditions
  • Nesting: Natural nesting in soil/leaf litter on rainforest floor. Test tube setups work for founding, Y-tong or plaster nests for established colonies
• Behavior: Behavior is unstudied in captivity. Based on genus typical behavior, majors (soldiers) likely use their larger heads for seed-crushing and colony defense. Expect typical Pheidole foraging patterns, workers collect seeds and small prey. Escape risk is moderate due to small minor worker size, use standard barriers. Sting risk is very low as Pheidole species rarely sting and their stingers are too small to penetrate human skin.
• Common Issues: no captive husbandry data exists, this is one of the least-studied Pheidole species, wild-caught colonies may carry parasites or pathogens not yet characterized, growth rate is unknown making colony development difficult to predict, specific humidity requirements are unconfirmed, start with moderately humid conditions and observe, founding colonies are fragile and prone to abandonment if conditions are suboptimal

Species Discovery and Naming

Pheidole jeannei was described by E.O. Wilson in 2003 from specimens collected at Taperinha in Santarem, Pará, Brazil. The collector was Robert L. Jeanne, a distinguished hymenopterist after whom the species was named. The type series was collected from the floor of lowland rainforest, which remains the only confirmed collection locality. This makes P. jeannei one of the more rarely encountered Amazonian Pheidole species, with limited distribution data spanning southern Pará and northern Maranhão in Brazil, plus confirmed presence in French Guiana. ^[1]

Identification and Distinguishing Features

As a member of the gertrudae species group, P. jeannei can be distinguished from related species (P. capillata and P. gertrudae) by several key features. The major workers have extensive rugoreticulum (net-like wrinkles) on the head, transverse carinulae (ridge-like structures) on the pronotal dorsum, and notably lack any propodeal spine or denticle. In side view, the basal and declivitous propodeal faces form a blunt right angle. Major workers measure approximately 1.12mm head width with medium brown coloration and brownish-yellow appendages. Minor workers are smaller at 0.56mm head width and appear dark reddish brown. ^[1]

Known Distribution

This species has a relatively restricted known range within the Amazon basin. The type locality is Taperinha near Santarem in Pará state, Brazil. Subsequent records confirm its presence in the Brazilian state of Maranhão (Amazon-Cerrado transition zone) and in French Guiana. A 2009 Colombian study recorded the species in terra firme forest (BFT, Bosque de Tierra Firme), suggesting the species may be more widespread than currently documented. The species appears to be associated with lowland rainforest floor habitats, typically collected from leaf litter and soil samples. ^[1]

Housing and Nesting

Since no captive husbandry information exists for this species, care recommendations must be inferred from what is known about its natural habitat and typical Pheidole behavior. The species was collected from lowland rainforest floor, indicating it prefers warm, humid conditions with access to soil substrate. For founding colonies, standard test tube setups work well, fill the tube with water and plug with cotton, providing a dark enclosure. For established colonies, Y-tong (acrylic) nests or plaster nests with moisture reservoirs work well. The nest should be kept humid but with some drier areas available so ants can self-regulate. A small outworld for foraging allows workers to collect food. ^[1]

Feeding and Diet

Pheidole belongs to the tribe Attini, which are typically granivorous (seed-eating) ants that also supplement their diet with small insects and honeydew. In captivity, offer a varied diet including small seeds (millet, chia, grass seeds), protein sources (small mealworms, fruit flies, crickets), and sugar water or honey. The major workers have enlarged heads designed for seed crushing, so offering harder seeds they can process is beneficial. Feed protein 2-3 times per week and ensure constant access to sugar water. Remove uneaten food promptly to prevent mold. ^[1]

Temperature and Seasonal Care

As an Amazonian lowland rainforest species, P. jeannei requires warm, stable temperatures year-round. Aim for 24-28°C (75-82°F) in the nest area. A heating cable on one side of the nest can create a gentle gradient if room temperature is below this range. Unlike temperate species, this ant likely does not require a winter diapause period. Maintain humidity by keeping the nest substrate moist but not waterlogged, the goal is damp substrate, not standing water. Monitor for condensation, which indicates humidity is adequate. ^[1]

Frequently Asked Questions

References