Dorymyrmex lipan

Dorymyrmex lipan

Dorymyrmex lipan is a small, smooth-shining ant native to the southwestern United States and northern Mexico. Workers measure around 2.7mm in total length, with a medium reddish-brown body and distinctly darker gaster, while their antennae and legs are yellowish. The species was described by Snelling in 1995 and is named after the Lipan Apache people of western Texas. These ants are found in the Chisos Mountains of Big Bend National Park, Texas, and across northern Mexico in states including Baja California, Coahuila, and Tamaulipas, typically inhabiting pine-oak-juniper forests, pine forests, gallery forests, and xerophilous shrubland areas^[1][2].

The biology of this species remains unstudied in the scientific literature. As with most Dorymyrmex species, they are likely ground-nesting ants that build colonies in soil or under stones in open, sunny areas. Their smooth, shiny appearance distinguishes them from related species with more pubescent (hairy) surfaces. This species represents one of the more obscure North American ants in the hobby, making it an interesting choice for antkeepers seeking something different from common species like Lasius or Camponotus.

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Southwestern United States (Texas) and northern Mexico (Baja California, Coahuila, Tamaulipas). Found in pine-oak-juniper forest, pine forest, gallery forest, tropical deciduous forest, and xerophilous shrubland at elevations around 4800 feet ^[1].
• Colony Type: Unconfirmed, likely single-queen colonies based on typical Dorymyrmex patterns
• Size & Growth:
  • Queen: Unknown, not described in original species description
  • Worker: 2.7mm total length (HL 0.81mm, HW 0.71mm, SL 0.79mm)
  • Colony: Unknown, likely moderate colony size based on genus patterns
  • Growth: Unknown, likely moderate growth rate
  • Development: Unknown, estimated 6-10 weeks based on typical Dolichoderinae development at warm temperatures (No direct data exists. Estimates based on related Dolichoderinae species like Tapinoma and Linepithema which typically develop in 6-10 weeks at 25-27°C.)
• Antkeeping:
  • Temperature: Start around 24-27°C with a gradient, they inhabit warm southwestern habitats and likely prefer temperatures in this range. Reduce slightly during winter months.
  • Humidity: Low to moderate, these ants inhabit arid to semi-arid regions of Texas and northern Mexico. Keep nest substrate moderately dry with a small water tube for humidity, avoiding constant moisture.
  • Diapause: Likely, Dorymyrmex species in temperate regions typically require a winter rest period. Provide 3-4 months at 10-15°C during winter.
  • Nesting: Naturalistic setups with dry to moderately moist substrate work well. In nature they nest in soil under stones in sunny, open areas. A Y-tong or plaster nest with a dry to slightly damp section is appropriate. Avoid overly humid conditions.
• Behavior: Dorymyrmex ants are generally non-aggressive and fast-moving, typical of Dolichoderinae. Workers are active foragers that likely scavenge and collect honeydew. They are not known to sting and pose no danger to keepers. Their small size (under 3mm) means escape prevention should be taken seriously, use fine mesh and tight-fitting lids. They are likely diurnal foragers, exploiting warm daytime temperatures in their native habitat.
• Common Issues: no biological data means care is based on genus-level inference rather than species-specific research, slow colony growth compared to faster-developing tropical species may frustrate beginners, escape risk due to small size requires excellent barrier systems, winter diapause is likely required but specific timing and temperature are unknown, limited availability in the antkeeping hobby makes this species difficult to acquire

Natural History and Distribution

Dorymyrmex lipan occupies a range spanning the southwestern United States and northern Mexico. The type locality is the Chisos Mountains in Big Bend National Park, Texas, at an elevation of approximately 4800 feet. In Mexico, specimens have been recorded from Baja California, Coahuila, and Tamaulipas, with the largest collection numbers coming from Ensenada in Baja California (54 specimens) and Tamaulipas (53 specimens from Miquihuana and Ciudad Victoria) ^[1].

These ants inhabit diverse environments including pine-oak-juniper forest, pine forest, gallery forest, tropical deciduous forest, xerophilous (dry) shrubland, and secondary vegetation. This suggests adaptability to different conditions, though all are relatively warm, often dry habitats. The elevation range and habitat diversity indicate this species can tolerate various microclimates within its range ^[1].

Nothing specific is known about their nesting biology, but Dorymyrmex species typically nest in soil, often under stones or in open ground. They construct small colonies with single queens. Workers are generalist foragers that likely scavenge for sugary substances and protein sources.

Identification and Distinguishing Features

Dorymyrmex lipan workers are small ants measuring approximately 2.7mm in total length. The head is nearly smooth and shiny with very sparse appressed pubescence (flattened hairs), which distinguishes this species from many related Dorymyrmex that have more hairy (pubescent) heads. The body is medium reddish-brown with the gaster (abdomen) being the darkest part. Antennae and legs are yellowish.

Specific measurements: Head length 0.81mm, head width 0.71mm, scape length 0.79mm, eye length 0.22mm. The cephalic index (CI) is 88,meaning the head is slightly longer than wide. The scape index (SI) is 98,indicating the antennae are nearly as long as the head is wide.

In the antkeeping hobby, proper identification can be challenging without comparison material. The smooth, shiny appearance combined with the small size and reddish-yellow coloration should help distinguish them from more common ants in the genus.

Housing and Nest Setup

Since specific nesting biology is unknown, housing recommendations must be based on genus-level patterns and natural habitat. Dorymyrmex lipan likely nests in soil in warm, sunny, relatively dry areas. In captivity, provide a naturalistic setup with a dry to moderately moist substrate, or use a Y-tong (acrylic) nest with a small water reservoir.

Avoid overly humid conditions, these ants come from arid to semi-arid regions. A gradient from slightly damp to dry works well. The nest should have chambers scaled to their tiny 2.7mm size, with narrow passages. Test tube setups can work for founding colonies, but monitor humidity carefully as these ants prefer drier conditions than many common species.

For the outworld (foraging area), provide standard setup with a sugar water feeder and protein food dish. Escape prevention is important due to their small size, use fine mesh barriers and ensure all openings are sealed.

Feeding and Diet

The specific diet of Dorymyrmex lipan has not been documented. As a Dorymyrmex species, they are likely generalist foragers similar to other Dolichoderinae ants. They probably scavenge for honeydew from aphids and scale insects, collect nectar, and hunt small insects for protein.

In captivity, offer a standard ant diet: constant access to sugar water or honey (diluted honey water works well), and protein sources such as small insects (fruit flies, small mealworms, crickets). Feed protein 2-3 times per week, removing uneaten food after 24-48 hours. Sugar water should always be available.

Since their specific preferences are unknown, start with basic offerings and observe what the colony accepts readily. The small worker size suggests they may prefer very small prey items.

Temperature and Seasonal Care

Dorymyrmex lipan inhabits warm regions of Texas and northern Mexico, suggesting they prefer temperatures in the low-to-mid 20s°C range or higher. Provide a temperature gradient around 24-27°C in the nest area, with the foraging area potentially warmer. A heating cable on one side of the nest can create this gradient.

Like most temperate ants in their range, they likely require a winter dormancy period. During winter (roughly November through February in the Northern Hemisphere), reduce temperatures to 10-15°C to simulate natural seasonal changes. This rest period is important for colony health and may trigger reproductive behavior in spring.

Monitor colony activity, if workers become sluggish and cluster together, temperatures may be too low. If they avoid the heated areas, reduce temperature.

Colony Development and Growth

No specific data exists for Dorymyrmex lipan colony development. Based on related Dolichoderinae species (Tapinoma, Linepithema), expect development from egg to first worker (nanitic) to take approximately 6-10 weeks at optimal temperatures of 25-27°C. This is a moderate growth rate, faster than many Camponotus but slower than tropical species.

First workers will be smaller than normal workers (nanitics), which is typical in ant species. The colony will grow gradually as more workers emerge. Maximum colony size is unknown but likely reaches several hundred workers based on typical Dorymyrmex colony sizes.

Patience is key with this species, limited data means growth may not follow predictable patterns. Document your colony's development to help build knowledge for other keepers.

Frequently Asked Questions

References