Newly described insect may live its whole life on a spider’s web

A new insect species has been discovered that may spend its entire life cycle on a spider's web. This tiny, reddish bug, named Heissophila sinica, was found in the wild in Fujian province during fieldwork in September 2025. The insect is significantly smaller than its closest relatives, which are predominantly found in South-East Asia.

Web-loving bugs are rare and are known to inhabit low numbers in various tropical regions. Xiong and his team collected the tiny insects from the tangled homes of funnel web spiders and brought them back to the lab for identification and further study. The researchers determined that H. sinica belongs to an undescribed species.

These web-loving bugs take advantage of an ephemeral microhabitat created by spiders and a few other silk-weaving arthropods. Despite their small size, the bugs follow the spiders around and circle them, a behavior that remains unclear. The bugs feed on the scraps left after the spider eats and also consume mites that live within the spider's web.

The researchers are still unsure whether the bugs mostly help or hinder the spiders, or if they have a neutral impact. If they have no significant effect, the bugs could be considered commensal organisms. The insects may live their entire lives on the spider's web, as eggs, juveniles, and adults have been found simultaneously on the web.

The team plans to continue their efforts in collecting web-loving bugs in China and neighboring regions to gather genetic data and better understand the evolution of these mysterious spider web tenants.