Home / Orb Weavers / Darwin’s Bark(Caerostris darwini)

Darwin’s Bark(Caerostris darwini)

The sexually dimorphic spider is an orb weaver, known for its intricate webs. Not only is its web so dramatic, but the courtship behavior is also enchanting to start with.

Scientific Classification

Darwin’s Bark Spider

Physical Description and Identification

Adults

Size: Female spiders are 0.7-0.9 in (1.7-2.2 cm) and male spiders are round 0.2 in (0.5 cm).

Color: Female Darwin’s bark spiders have a black body and their cephalothorax, appendages, and abdomen have white hairs. Male spiders have a brown to red colored body with white hairs on the same parts as on the females.

Other Characteristic Features: Female spiders have two pairs of humps on the upper portion of their cephalothorax. One pair is located on one side, and the other pair is placed on the back. Male spiders exhibit their palpal bulb or genital organ with a straight-tipped conductor and the embolus is longer than any of its cousins.

Darwin Bark Spider Size

Eggs

These spiders lay their eggs into a sac produced by them beforehand.

Spiderlings

Nothing in particular has been known about the spiderlings of this species.

The Web

The webs are extremely strong, elaborate and as wide as 3 ft. They build webs over a waterbody and the orb stays exactly above. It helps them catch more numbers of preys than any other spider. They follow a series of process to make such webs. 

Darwin Bark Spider Web

Are Darwin’s Bark Spider Poisonous

Darwin’s bark spiders are not venomous.

Quick Facts

Distribution Madagascar
Habitat Near waterbodies
Web Type Orb web
Diet Mayflies and other aquatic insects
IUCN Conservation Status Not Listed
Darwin Bark Spider Silk

Did You Know

  • The web of Darwin’s bark spider is the largest, strongest, and the most complex web in the entire world. The bridge line of the web could extend up to 82 ft and the spider can cross a river depending on its web. The silk that it produces is the strongest amongst all spider species.
  • It has got the name after Charles Darwin.
  • 2009 is the year when the species was first discovered at the Andasibe-Mantadia National Park, Madagascar and the next year marks the beginning of the research regarding the species.
  • The female spider either eats the male counterpart or castrate it post-copulation.

Image Credits: I.ytimg.com, 4.bp.blogspot.com, 3.bp.blogspot.com, Asknature.org

The sexually dimorphic spider is an orb weaver, known for its intricate webs. Not only is its web so dramatic, but the courtship behavior is also enchanting to start with.

Darwin’s Bark Spider

Physical Description and Identification

Adults

Size: Female spiders are 0.7-0.9 in (1.7-2.2 cm) and male spiders are round 0.2 in (0.5 cm).

Color: Female Darwin’s bark spiders have a black body and their cephalothorax, appendages, and abdomen have white hairs. Male spiders have a brown to red colored body with white hairs on the same parts as on the females.

Other Characteristic Features: Female spiders have two pairs of humps on the upper portion of their cephalothorax. One pair is located on one side, and the other pair is placed on the back. Male spiders exhibit their palpal bulb or genital organ with a straight-tipped conductor and the embolus is longer than any of its cousins.

Darwin Bark Spider Size

Eggs

These spiders lay their eggs into a sac produced by them beforehand.

Spiderlings

Nothing in particular has been known about the spiderlings of this species.

The Web

The webs are extremely strong, elaborate and as wide as 3 ft. They build webs over a waterbody and the orb stays exactly above. It helps them catch more numbers of preys than any other spider. They follow a series of process to make such webs. 

Darwin Bark Spider Web

Are Darwin’s Bark Spider Poisonous

Darwin’s bark spiders are not venomous.

Quick Facts

Distribution Madagascar
Habitat Near waterbodies
Web Type Orb web
Diet Mayflies and other aquatic insects
IUCN Conservation Status Not Listed
Darwin Bark Spider Silk

Did You Know

  • The web of Darwin’s bark spider is the largest, strongest, and the most complex web in the entire world. The bridge line of the web could extend up to 82 ft and the spider can cross a river depending on its web. The silk that it produces is the strongest amongst all spider species.
  • It has got the name after Charles Darwin.
  • 2009 is the year when the species was first discovered at the Andasibe-Mantadia National Park, Madagascar and the next year marks the beginning of the research regarding the species.
  • The female spider either eats the male counterpart or castrate it post-copulation.

Image Credits: I.ytimg.com, 4.bp.blogspot.com, 3.bp.blogspot.com, Asknature.org

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