Spotted Orb Weaver (Neoscona crucifera)

The spotted orb weaver is a tiny spider that lives in places like Florida, Maine, Arizona, and Minnesota. Part of the orb weavers family, they usually roam at night. But, when fall arrives, female spiders change their routine and come out during the day.

Physical Description and Identification

Adults

• Size: Females are 0.37-0.74 inches (9.3-19 mm) and males are slightly smaller.

• Color: Orange or rust body with brownish-green or black markings. The carapace is mostly grey along with brown patterns. Green legs have brown rings on them.
• Other Characteristic Features: The abdomen has a triangular shape like other orb weavers.

Eggs

Eggs have a spherical shape, each sizing 0.19-0.47 in (5-12 mm)  released in groups of about 1,000 at a time in a sac prepared from yellow and fluffy threads. They hatch in spring.

Spiderlings

Right after the hatching, the young ones are on their own. The juvenile females start weaving, while the males look for food.

The Web

Every night, this spider spins a new round and swirly web on things like walls, trees, or fences, not too high off the ground. When morning comes, the spider eats up the web.

Are Spotted Orb Weaver Spiders Venomous?

Yes, spotted orb weaver spiders have venom, but it’s generally not harmful to humans.

Can Spotted Orb Weaver Spiders Bite?

Spotted orb weaver spiders can bite, but it’s rare. If they do, the bite is usually mild and similar to a bee sting for most people.

Ecological Importance and Behavior of Spotted Orb Weaver

The Spotted Orb Weaver, scientifically named Neoscona crucifera, is an essential player in controlling insect populations. This spider’s nocturnal activities help maintain ecological balance by preying on nocturnal insects that might otherwise damage crops and gardens. In the fall, the diurnal shift in female behavior can be attributed to the mating season and the need to increase body temperature for egg development.

Natural Predators: This spider is preyed upon by a variety of birds and larger insects. The spider’s coloration and patterns provide some camouflage against predators, blending with foliage and the bark of trees.

Prey-Predator Dynamics: The Spotted Orb Weaver’s web is a masterpiece of natural engineering designed to capture flying insects such as moths and flies. Their venom paralyzes prey, allowing the spider to consume it at their leisure.

Relationship with Humans: Generally, these spiders are harmless to humans and can be considered beneficial due to their predation on common pests. The fear they might provoke is disproportionate to the actual risk they pose, which is minimal.

Quick Facts

Did You Know

• Only female spotted orb weavers make the web.
• The species share the common name barn spider with another species Araneus cavaticus.
• Their species name ‘crucifera‘ means ‘cross bearer’ in Latin. It is because they have a cross pattern on their abdomen.

In summary, the Spotted Orb Weaver is a non-threatening, advantageous arachnid that plays a crucial role in its habitat.