The skeleton tarantula, scientifically known as Ephebopus murinus, is an intriguing species belonging to the Theraphosidae family, more commonly referred to as the tarantulas. It is a member of the Aviculariinae subfamily, a group known for its distinct behaviors and habitats. The species is native to several countries in South America, with a range that includes Brazil, French Guiana, and Suriname. The name “skeleton tarantula” comes from the distinctive, skeleton-like markings that adorn its legs—an identifying feature that makes this species one of the more fascinating tarantulas in the arachnid world.
In this article, we’ll delve into the biology, behavior, and unique traits of Ephebopus murinus, unraveling the fascinating life of this often-misunderstood creature.
Taxonomy and Naming
The Ephebopus murinus was first described by Charles Athanase Walckenaer in 1837 under the name Mygale murina. The genus name Ephebopus was later assigned by Eugène Simon in 1892, a name derived from the Greek words “youth” and “foot”—a fitting description for this youthful-looking species. The species name, murinus, comes from the Latin word meaning “mouse-colored,” which refers to its overall appearance.
The tarantula was briefly described as Santaremia pococki by Frederick Octavius Pickard-Cambridge in 1896, but in 1903, Reginald Innes Pocock synonymized this name with E. murinus. Since then, Ephebopus murinus has been the accepted scientific name for the species.
Physical Description
The skeleton tarantula is a relatively medium-sized tarantula species. Adult E. murinus typically reaches a leg span of 11–12 cm (4.5 inches), though females can grow as large as 15 cm (6 inches). These spiders have a distinctive appearance that sets them apart from other tarantulas.
Key Features:
Legs: The legs of Ephebopus murinus are primarily black, with striking yellowish stripes resembling skeletal markings. These markings give the tarantula its common name of “skeleton tarantula.” The pattern is similar to the leg striping seen in the Aphonopelma seemani species, but with a more prominent yellowish hue.
Carapace: The carapace (the upper part of the cephalothorax) is typically coffee-colored or golden, adding to the spider’s beauty.
Abdomen: The abdomen is smaller and brown, making it less conspicuous than other parts of the body.
This striking appearance helps the skeleton tarantula camouflage itself in its natural habitat, blending in with the forest floor debris where it resides.
Habitat and Distribution
The Ephebopus murinus is a terrestrial, semi-fossorial species, meaning it spends much of its life on or near the ground, often building burrows. Unlike many of its relatives in the Aviculariinae subfamily, which are typically arboreal (tree-dwelling), E. murinus thrives in lowland forest environments. Its natural range spans across the northern regions of Brazil, French Guiana, and Suriname, where it occupies the forest floor beneath the topsoil, as well as among fallen branches, rocks, and other natural debris.
The skeleton tarantula is most commonly found in areas with dense vegetation and a steady humidity level, which helps maintain the stability of its burrow. This burrowing behavior is essential for the tarantula’s survival, providing shelter from predators and helping to regulate temperature and moisture levels.
Behavior: A Quick and Defensive Predator
Burrowing and Webbing
One of the most fascinating behaviors of the skeleton tarantula is its burrowing habit. It will create a heavily webbed burrow beneath the topsoil or among debris, which it uses both as a hiding place and a hunting ground. These tarantulas are known to be semi-fossorial, meaning they dig down into the soil but may also remain partially exposed when the conditions are right. The burrows can be elaborate, with intricate webs designed to trap prey that wanders too close.
The tarantula will spend most of its time inside this burrow, emerging only to hunt or for short exploratory ventures. The webbing serves multiple purposes: it strengthens the burrow, keeps it hidden, and acts as a trap for insects. The skeleton tarantula’s burrow is often quite deep, and the spider will retreat into it quickly if it feels threatened.
Defensive Behavior: Urticating Hairs
As with many New World tarantulas, Ephebopus murinus has developed a defensive mechanism in the form of urticating hairs. These are small, barbed hairs that the tarantula can release from its body when it feels threatened. Unlike other tarantulas, however, the urticating hairs of the skeleton tarantula are located not on the abdomen but on the palps—the small appendages near the spider’s mouthparts.
To deploy these hairs, the tarantula rubs its palp against its chelicerae (fangs), dislodging the tiny hairs into the air. These barbed hairs can irritate the skin and eyes of potential predators or threats, causing discomfort and often encouraging the attacker to retreat. This unique defense mechanism makes the skeleton tarantula particularly well-equipped to defend itself.
Aggressive and Fast
Another notable feature of Ephebopus murinus is its aggressive nature. Unlike some more docile tarantulas, the skeleton tarantula is quick to react to perceived threats and will readily rise up on its hind legs, displaying its fangs in an aggressive posture. This behavior is often a last resort, but it is a clear indication of the tarantula’s willingness to fight if necessary.
The tarantula’s speed and defensive aggression make it a formidable opponent for any predator attempting to approach its burrow.
Conclusion
The skeleton tarantula, Ephebopus murinus, is a remarkable species, not just because of its striking appearance but because of its well-adapted lifestyle. Its ability to blend into its environment, create complex burrows, and defend itself with unique urticating hairs makes it a true survivor in the wild. The combination of aggression, speed, and defensive mechanisms ensures that E. murinus remains a top predator in its ecosystem.
Whether you are a seasoned arachnid enthusiast or a newcomer to the world of tarantulas, the skeleton tarantula offers a fascinating glimpse into the world of New World tarantulas. With its skeletal markings, burrowing habits, and aggressive behaviors, it’s a species you won’t soon forget.
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