Bird-dropping Araneids

Cyrtarachne nagasakiensis

Cyrtarachne nagasakiensis is a species within the genus Cyrtarachne, part of the orb-weaver spider family (Araneidae). Orb-weaver spiders are recognized for their intricate webs, used to capture prey. The Cyrtarachne genus includes spiders that often have unique web designs and body shapes, distinguishing them from the classic orb-weaver silhouette. Cyrtarachne nagasakiensis, like its congeners, is likely known for a distinctive appearance and possibly a unique web structure. Orb-weavers in this genus can exhibit a variety of colors and patterns, which help in camouflage or deterring predators.

Classification

KINGDOM

:

Animalia

PHYLUM

:

Arthropoda

CLASS

:

Arachnida

ORDER

:

Araneae

FAMILY

:

Araneidae

GENUS

:

Cyrtarachne

SPECIES

:

Cyrtarachne nagasakiensis

Other Information

Venomous?

As is typical for orb-weaver spiders, Cyrtarachne nagasakiensis is venomous, utilizing its venom to immobilize prey caught in its web. The venom is generally not harmful to humans, causing mild symptoms if a bite occurs.

A Danger to Humans?

There is minimal danger to humans from Cyrtarachne nagasakiensis. These spiders are not aggressive toward humans, and interactions are rare. Bites are uncommon and typically not medically significant.

Population Status

Detailed information on the specific population size of Cyrtarachne nagasakiensis is limited. As with many spider species, their populations can vary widely based on environmental conditions and the availability of prey.

Life Span:
The life span of Cyrtarachne nagasakiensis, as with many spiders, might range from 1 to several years, depending on environmental factors and reproductive cycles.

Weight and Length:
Male 1-2 mm, Female 5-8 mm.

Distribution:
Cyrtarachne nagasakiensis is indicated by its name to be found in Singapore, Malaysia (Sarawak), Indonesia (Bali), parts of China, India, Pakistan, Japan (Nagasaki) and South Korea.

Habits and Lifestyle:
Orb-weavers, including those in the Cyrtarachne genus, typically lead solitary lives centered around their webs. They spend significant time in or near their webs, waiting for prey to become ensnared. Foliage secondary forest, and among tall grasses in parkland.

Diet and Nutrition:
The diet mainly consists of flying insects that get caught in the spider’s web. The web’s design and placement play crucial roles in the types and quantities of prey captured.

Mating Habits:
The mating behavior of Cyrtarachne nagasakiensis likely involves careful approach tactics by males to avoid being mistaken for prey. Orb-weaver spiders usually exhibit complex courtship rituals, which can include visual displays and vibratory signals sent through the web strands.

PHOTO COLLECTION

Reference

  1. https://www.inaturalist.org/taxa/360562-Cyrtarachne-nagasakiensis
  2. https://en.wikipedia.org/wiki/Cyrtarachne_nagasakiensis
  3. Book: A Photographic Guide To Singapore Spiders