Spined Micrathena (Micrathena gracilis)

The Spined Micrathena is a standout spider with its black and white body and spiky tummy. Part of the orb-weaver family, you’ll mostly spot this daytime-loving spider during late summer and early autumn. Let’s discover some cool facts about this special spider.

Physical Description and Identification

Adults

• Size: They are 0.16 to 0.42 inches (4.2 to 10.8 mm) in length, with females being bigger than their male counterparts.
• Color: Most of the spined micrathena spiders have a black and white body, while some may display yellow patches to their sides. They also have an amber carapace and glossy, black legs.
• Other Characteristic Features: Their big, spined abdomen appears to be their defining feature. The size, however, differs in both sexes as it is bulbous in females and flattened in males who even have fewer spines.

Eggs

The eggs are round and small, laid in a sac, hidden carefully in the web, mostly to the sides.

Spiderlings

Not much is known about the spiderlings of the spined micrathena. However, like most other species, the spiderlings go through several molts before attaining maturation.

The Web

They have a tightly coiled spiral or circular webs positioned vertically. Like other orb-weavers, the spined micrathena rebuilds its webs daily, changing the inner orbs every night. At the same time, the outer layers remain the same for a specified period. They keep shifting and do not stay at a particular web site for more than a week.

Are Spined Micrathena Spiders Venomous?

Yes, Spined Micrathena spiders do have venom. They use it mainly to catch their food. But for humans, the venom is usually pretty mild.

Can Spined Micrathena Spiders Bite?

Yes, Spined Micrathena spiders can bite. They’re peaceful spiders, but if they get really scared, they might give a little bite.

Ecological Importance and Behavior of Spined Micrathena Spider

The Spined Micrathena plays a crucial role in its ecosystem, contributing to the control of insect populations. Its unique web structure and daily maintenance rituals are a testament to its industrious nature. During the day, this spider is active and can often be found tending to its web or hunting.

Natural Predators: Despite their agility and clever hunting techniques, Spined Micrathena spiders are not without predators. Birds and larger spiders pose a significant threat, highlighting the precarious balance of nature.

Prey-Predator Dynamics: The Spined Micrathena is a vital component of its ecological community, serving as both predator and prey. This complex relationship ensures the balance and health of its habitat, showcasing the interconnectedness of life within the forest.

Relationship with Humans: While they prefer the solitude of hardwood forests, Spined Micrathena spiders occasionally find themselves in proximity to human habitation. Their presence is beneficial, as they help control insect populations. For arachnid enthusiasts and researchers, the Spined Micrathena offers a fascinating subject for study, with its unique appearance and behaviors sparking curiosity and wonder.

Quick Facts

Did You Know

• Because of its spiral appearance, when it hangs from trees, it resembles a CD.

In summary, the Spined Micrathena is a remarkable spider, with its spiky abdomen and intricate web-making skills capturing the attention of those lucky enough to encounter it.