Nylanderia smythiesii

Nylanderia smythiesii

Nylanderia smythiesii is a small, slender ant native to the Himalayan region of Northwest India and Nepal. Workers measure just 0.60-0.68mm in head length, making them one of the smaller ant species you'll encounter. They have a distinctive appearance with an oval-shaped head that is longer than wide, and their most striking feature is their remarkably smooth, shiny cuticle with almost no pubescence, a key identification trait that sets them apart from related species. Workers are brown with a brown-to-black gaster, while their mesosoma, antennae, and legs are yellowish brown. Queens are larger at 0.84mm head length and have a subtriangular head with dense pubescence. This species was originally described in 1894 and remained known only from queen and male castes until the worker caste was formally described in 2014.

Quick Summary

• Difficulty: Easy
• Origin & Habitat: Endemic to low altitude areas of Northwest India (Himachal Pradesh, Jammu & Kashmir, Punjab, Uttarakhand) and recently recorded in Nepal. Found in the Shivalik range of the Northwest Himalaya, typically nesting under stones and leaf litter in warm, relatively drier habitats.
• Colony Type: Colony structure is unconfirmed. Nylanderia species vary, some are single-queen while others form multi-queen colonies. Further research needed to confirm the colony structure for this specific species.
• Size & Growth:
  • Queen: 0.84 mm head length ^[1][2]
  • Worker: 0.60-0.68 mm head length ^[1][2]
  • Colony: Unknown, no colony size data available
  • Growth: Unknown, growth rate has not been studied
  • Development: 6-10 weeks (estimated based on typical Nylanderia genus patterns) (Development time is unconfirmed for this species. Estimates based on related Nylanderia species suggest 6-10 weeks from egg to first worker at optimal temperature.)
• Antkeeping:
  • Temperature: Based on their Himalayan origin from warm lowland areas, they likely prefer temperatures in the low-to-mid 20s°C range (approximately 22-26°C). Start around 24°C and observe colony activity, if workers cluster near heat sources, increase slightly, if they avoid heated areas, reduce temperature.
  • Humidity: Lowland Himalayan regions experience moderate humidity. Keep nest substrate moderately moist but allow some drying between waterings. Provide a moisture gradient so ants can self-regulate. Avoid waterlogging.
  • Diapause: Unknown, diapause requirements have not been studied for this species. Given their Himalayan distribution, a cool period during winter months is likely beneficial, but specific duration and temperature needs are unconfirmed.
  • Nesting: In the wild, nests are found underneath stones and leaf litter. For captivity, a Y-tong (AAC) nest or plaster nest with moderate humidity works well. Provide a test tube setup for founding colonies with access to an outworld. They prefer narrow chambers and will readily use test tubes.
• Behavior: Workers are active foragers that travel along trails, commonly found on trees and fallen trunks in the wild. They are not aggressive and typically flee when disturbed. Their small size (under 1mm) means they can escape through tiny gaps, excellent escape prevention is essential. They are fast-moving and can be difficult to contain. They likely feed on honeydew, small insects, and sugary substances, following typical Nylanderia foraging patterns.
• Common Issues: escape prevention is critical due to their very small size, use fine mesh barriers and tight-fitting lids, colony growth may be slow, which can frustrate beginners expecting rapid development, wild-caught colonies may have parasites that can cause colony collapse in captivity, test tube setups can flood if water reservoirs are overfilled, use appropriate tube sizes, they are sensitive to drying out but also prone to mold in overly humid conditions, balance is key

Identification and Appearance

Nylanderia smythiesii is distinctive among Indian Nylanderia species due to its remarkably smooth and shiny cuticle with almost no pubescence. Workers have a broadly oval head that is distinctly longer than wide, slightly wider at the posterior. The eyes are large and oval, covering about one-third of the lateral cephalic margin. Their antennae are long, with the scapes surpassing the posterior margin by two-fifths their length. The body coloration is distinctive: head is brown, gaster is brown to black, while the mesosoma, antennae, and legs are yellowish brown. This color pattern helps distinguish them from similar species. Queens are larger (0.84mm head length) with a subtriangular head and denser pubescence. Males are smaller at 0.52-0.55mm head length and have large, projecting eyes and 13-segmented antennae. ^[1][2]

Natural History and Distribution

This species is endemic to the Himalayan region, specifically found in low altitude areas of Northwest India including Himachal Pradesh, Jammu and Kashmir, Punjab, and Uttarakhand. The type locality is the Shivalik range of the Northwest Himalaya near Dehradun, Uttarakhand. Recent surveys have also recorded the species in Nepal, expanding its known range. They inhabit warm, relatively drier lowland areas at lower elevations. Nests are typically found underneath stones and leaf litter, making them relatively easy to locate in suitable habitat. Foraging workers are commonly observed on trees and fallen trunks, indicating they are active surface foragers. This arboreal foraging tendency means they will readily explore vertical spaces in captivity. ^[1][2]

Housing and Nest Setup

For founding colonies, a standard test tube setup works well. Use a small test tube with a water reservoir sealed with a cotton plug, fill only about one-third to one-half with water to prevent flooding. Place the tube in a dark area to encourage the queen to seal herself in a chamber. Once the colony establishes (after first workers emerge), you can connect the test tube to a small outworld using tubing. For established colonies, Y-tong (AAC) nests or plaster nests work well, providing chambers scaled to their tiny size. Because they are small and agile, ensure all connections are secure and use fine mesh on any ventilation. They do best with moderate humidity, not too wet, not too dry. A small water tube connected to the nest helps maintain humidity.

Feeding and Diet

Based on typical Nylanderia feeding behavior, they likely accept a varied diet including honeydew, small insects, and sugary solutions. Offer a drop of sugar water or honey diluted with water as a constant sugar source. For protein, offer small insects like fruit flies, pinhead crickets, or other appropriately-sized prey. They are small, so prey items should be tiny, springtails or flightless fruit flies are ideal. Feed small amounts every few days, removing uneaten prey after 24 hours to prevent mold. Observe what they prefer and adjust accordingly. Freshly killed insects are usually more readily accepted than live prey for smaller colonies.

Temperature and Seasonal Care

Nylanderia smythiesii originates from the warm lowlands of the Northwest Indian Himalayas, suggesting they prefer temperatures in the low-to-mid 20s°C range. Start around 24°C and observe your colony's behavior, if workers cluster near any heat source, the temperature can be increased slightly, if they avoid heated areas, reduce temperature. Room temperature (20-24°C) is likely suitable for this species. Regarding winter care, the specific diapause requirements are unconfirmed. However, given their Himalayan distribution, a cooler period during winter months is likely beneficial. If you choose to cool them, reduce temperature to around 15-18°C for 2-3 months, ensuring they have access to water and not letting them dry out completely.

Behavior and Temperament

Workers are active foragers that travel in characteristic trails, a behavior common in the Formicinae subfamily. In the wild, they are frequently observed foraging on trees and fallen trunks, indicating they are comfortable moving across vertical surfaces. They are not aggressive and will typically flee when disturbed rather than engage in defensive behavior. Their small size (workers are under 1mm) makes them excellent escape artists, they can squeeze through remarkably small gaps. Excellent escape prevention is essential: use tight-fitting lids, fine mesh barriers, and ensure all connections between nest and outworld are secure. They are fast-moving and can be difficult to contain when foraging. ^[1][2]

Frequently Asked Questions

References