Back to today’s briefing

Story perspectives

World's Oldest Ribbon Worm Revealed: 30 Years Young!

12/14/2025

41 9 Full Breakdown

Summary

Story summary

Biologist Jon Allen owns Baseodiscus the Eldest, the world's oldest ribbon worm, estimated 26–30 years old and oldest in Nemertea.
The worm was collected from the San Juan Islands in the late 1990s.
The findings were published in the Journal of Experimental Zoology.
This finding enhances understanding of longevity in ribbon worms.

1 of 1

Story summary

Biologist Jon Allen owns Baseodiscus the Eldest, the world's oldest ribbon worm, estimated 26–30 years old and oldest in Nemertea.
The worm was collected from the San Juan Islands in the late 1990s.
The findings were published in the Journal of Experimental Zoology.
This finding enhances understanding of longevity in ribbon worms.