Chaco Golden Knee Tarantula
Grammostola pulchripes
Theraphosidae, Order Araneae. Characterized by dense urticating hairs and large, heavy bodies.
Physical Description
A large, robust New World tarantula. It features a dark, velvet-like cephalothorax and abdomen covered in long, sensitive hairs (setae). The body is stocky with thick legs designed for burrowing.
Size Estimate
Currently a juvenile/sub-adult (approx. 2-3 inches). Adults reach a body length of 3-3.5 inches and a leg span of 7-8 inches.
Coloration & Markings
Characterized by a dark charcoal or black base color with distinctive cream to golden-yellow vertical stripes on the patella and tibia (the 'knees'). Long pinkish-orange hairs may be present on the abdomen.
Web Type
Terrestrial burrower; does not spin webs for prey capture but lines its burrow with silk and may lay an 'alarm system' of silk around the entrance.
Eye Arrangement
Small ocular tubercle on the anterior of the cephalothorax containing 8 eyes in two rows, though vision is poor; senses vibration through specialized hairs.
Leg Characteristics
Thick, powerful legs with prominent golden-yellow striping on the joints. The tarsi feature dense scopulae (pads of specialized hairs) for gripping surfaces.
Venom & Safety Information
Venom Information
Possesses mild, localized venom. It is not considered dangerous to humans, with potency often compared to a bee sting.
Medical Significance
Low medical significance. Principal defense is kicking urticating (irritating) hairs from the abdomen, which can cause skin and eye irritation/inflammation.
Safety Recommendations
Handle with care to avoid dropping (which is fatal to heavy-bodied tarantulas). Use a soft brush for relocation. If 'flicked' with hairs, wash skin with soap and water; avoid touching eyes.
Habitat & Behavior
Habitat & Range
Native to the Chaco region of Argentina and Paraguay. Prefers grasslands and scrublands with seasonal rain.
Behavior & Temperament
Known as one of the most docile and calm tarantula species. Primarily nocturnal, terrestrial, and slow-moving. Often recommended for beginners in the hobby.
Diet & Prey
Opportunistic predator feeding on crickets, roaches, mealworms, and occasionally small vertebrates like lizards or mice in the wild.
Seasonal Activity
Active year-round in captivity; in the wild, activity peaks during the warmer, wetter months which coincide with mating seasons.
Description
The Chaco Golden Knee is a magnificent terrestrial tarantula known for its impressive size and contrasting golden stripes against a dark body. It is a prized species in the exotic pet trade due to its gentle nature and hardiness.
Key Features
Double golden-yellow stripes on the knees, large terrestrial body, and dark charcoal base coloration.
Similar Species
Eupalaestrus campestratus (Pink Zebra Beauty) which is smaller and has more tan markings, or Grammostola pulchra which is solid black without stripes.
Life Cycle
Slow-growing. Females can live over 20 years; males live significantly shorter lives (5-7 years). Lays several hundred eggs in a silk egg sac.
Ecological Importance
Critical apex invertebrate predator in its native range, controlling insect and small vertebrate populations.
Conservation Status
Not currently listed on IUCN Red List, but like all South American tarantulas, they face threats from habitat destruction and the illegal pet trade.
Interesting Facts
Despite their massive size, they are remarkably gentle. They utilize 'urticating hairs' as a primary defense, kicking them into the air to irritate the mucous membranes of predators.
Photography Tips
A macro lens is ideal to capture the 'knee' stripes. Low-angle shots highlight the spider's bulk. Use diffused light to prevent glare on the dark carapace.
Identified: 2026-07-06T19:27:56.324401