The Discovery of the Oldest Ribbon Worm: Baseodiscus the Eldest

Biologist Jon Allen has identified the world's oldest ribbon worm, named Baseodiscus the Eldest, affectionately referred to as 'B.' This marine invertebrate is estimated to be at least 26 years old, with some analyses suggesting it could be around 30. When fully extended, B measures approximately one meter (3 feet) in length. Ribbon worms, part of the phylum Nemertea, are known for their diversity and widespread presence in marine environments, yet little is understood about their longevity.

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Baseodiscus the Eldest stands out as the oldest recorded member of its phylum, significantly surpassing the previous record of a ribbon worm that was only three years old. Allen remarked, "This finding fills a genuine knowledge gap, increasing their known lifespan by an order of magnitude." This discovery not only enhances the understanding of ribbon worms but also shifts perceptions regarding the lifespan of marine predators in general.

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Allen has cared for B since 2005, after acquiring the worm from the University of North Carolina's biology department, where renovations had disrupted its habitat. The worm was collected as an adult from the San Juan Islands in the late 1990s. Over the years, B has traveled extensively, residing in various states including Washington, North Carolina, Maine, and Virginia.

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In 2024, a former student of Allen's encouraged him to conduct genetic testing on B, revealing that it belongs to the species Baseodiscus punnetti. This identification marks only the second instance of this species being genetically barcoded, highlighting the rarity and significance of the find.

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The longevity of Baseodiscus the Eldest may provide valuable insights into longevity research. Allen and his colleagues suggest that understanding lifespan estimates for nemerteans could enhance assessments of the ecological roles these long-lived benthic predators play in marine ecosystems. Their study was published in the Journal of Experimental Zoology, emphasizing the need for further research into the lifespans of marine invertebrates.

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• "This finding fills a genuine knowledge gap, increasing their known lifespan by an order of magnitude." — Jon Allen, Biologist

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• "Marine worms may offer important insights into longevity research." — Jon Allen, Biologist

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This discovery of Baseodiscus the Eldest not only enriches the scientific community's understanding of ribbon worms but also opens avenues for future research into marine biodiversity and longevity.

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