The Ordgarius is a unique group of orb-weaver spiders with twelve species identified by 2019. Among them, the Ordgarius magnificus or Magnificent Spider stands out as the most notable. Explore this post to discover intriguing facts about these fascinating creatures.
Size: The female spiders are about 15 mm (0.59 inches) long while the males do not exceed 2 mm (09.07 inches) in length.
Color: The colors would vary from one species to the other. The magnificent spider has a white-creamy body with yellow and pink spots. In contrast, the ordgarius hobsoni has a brownish body.
Other Characteristic Features: No striking or highlighting feature of the spiders belonging to this genus has been noted. However, individual species would have specific identifying traits, like the magnificent spider has tubercles on their head. At the same time, the ordgarius hobsoni also have spiny projections.
Eggs
The egg sacs remain clustered in the brown egg sacs mostly kept amidst foliages.
Spiderlings
Not much information has been obtained about the spiderlings, though like most other species they too live on their own after maturation.
The Web
Two spiders of this genus, namely, the Ordgarius magnificus and Ordgarius hobsoni, do not generally spin wheel-shaped or spiral webs like other members of the orb-weaver family. They are bolas spiders, capturing their prey by throwing or swinging a bolas (sticky blob attached to one end of a silken line) at them.
Are Ordgarius Spiders Venomous?
Yes, like most spiders, Ordgarius spiders have venom. However, their venom is not harmful to humans and is primarily used to immobilize their prey.
Can Ordgarius Spiders Bite?
While Ordgarius spiders can bite, they usually avoid humans and are not considered aggressive. Bites are rare and often result from accidental contact.
Ecological Importance and Behavior of Ordgarius Spider
Ordgarius spiders, particularly the bolas species, play a crucial role in the control of moth and butterfly populations, serving as natural pest regulators. Their non-conventional hunting technique is an evolutionary marvel, allowing them to selectively target and capture flying insects.
Natural Predators: These spiders are preyed upon by birds, larger spiders, and other predators within their forest ecosystems. This predation is a natural form of population control, ensuring ecological balance.
Prey-Predator Dynamics: The prey-predator relationship exhibited by Ordgarius spiders is complex and beneficial to their ecosystems. By preying on various insects, they help to keep these populations in check, thus contributing to the health of their habitats.
Relationship with Humans: Although Ordgarius spiders are venomous, they are not a threat to humans. Their venom is designed to immobilize small prey, not to defend against large mammals like humans. Interactions with these spiders are rare, as they tend to avoid human contact and are not aggressive.
Quick Facts
Distribution
Parts of Australia (Queensland and New South Wales) and Asia (India, Srilanka, Vietnam, Myanmar, Japan, Indonesia)
Habitat
Mostly in the forest areas
Diet
Mostly insects; some of them particularly the bolas spiders would feed on moths, butterflies, beetles, and pests
Lifespan
Approximately 1 year like most other orb-weavers
Did You Know
Arachnologist Eugen von Keyserling was the first to describe the genus in 1886.
In conclusion, the Ordgarius genus, with its diverse species and unique predatory methods, is an integral part of the ecosystem.
An Ordgarius is a genus of orb-weaver spiders more commonly known as bolas spiders. Instead of spinning traditional webs, these spiders hunt by swinging a sticky silk blob, or bolas, to catch prey. The genus includes twelve identified species, including the well-known Magnificent Spider (Ordgarius magnificus).
Ordgarius spiders catch prey using a specialized hunting technique instead of a web. They produce a single line of silk with a sticky globule at the end, known as a bolas. The spider swings this bolas at flying insects, such as moths, entangling them for capture and consumption.
No, Ordgarius spiders are not considered dangerous to humans. While they possess venom to immobilize their insect prey, it is not medically significant for people. A bite is highly unlikely and would not cause serious harm, but seeking medical advice for any spider bite is always recommended.
A significant size difference exists between the sexes of Ordgarius spiders. Adult females are relatively large, growing to about 15 mm (0.59 inches) in length. In contrast, the males are extremely small, typically measuring no more than 2 mm (0.07 inches), making them difficult to spot.
The Magnificent Spider has a distinct white to creamy-colored body marked with yellow and pink spots. A key identifying feature for this species is the presence of small, horn-like projections, called tubercles, on its head. This coloration and structure help distinguish it from other Ordgarius species.
No, Ordgarius spiders do not spin the classic, spiral-shaped orb webs their family is named for. They are bolas spiders, a specialized group that has evolved to hunt actively. Instead of a passive web, they use a single, weighted silk line to proactively catch flying insects at night.
Ordgarius spiders lay their eggs inside brown, papery egg sacs, which are often found clustered together. The female spider typically attaches these sacs to foliage, such as leaves and twigs. This placement helps camouflage the eggs, protecting them from predators until the spiderlings are ready to emerge.
Dr Richard J. Pearce (PhD) on June 3, 2020.
Spider Team
