Claim

Model ledger-default@0.1.0 ledger-strict@0.1.0 ledger-default@0.2.0 ledger-strict@0.2.0 ledger-default@0.3.0 (default) ledger-strict@0.3.0 Snapshot seq

Topics

Biology · 1efd24fe Ancient · 1efd24fe

Assessment

Why?

Strongest counted support: The packet directly states that Yujingia is placed within a grade of tentaculate fossils immediately basal to modern ambulacrarians' last common ancestor. weight 1.800000 evidence

Suppressed as dependent: The abstract places Yujingia immediately basal to the last common ancestor of modern ambulacrarians.

Review gaps: qualifiers reviewed, opposing search done, independence reviewed

What would most change this: One independent, direct measurement that contradicts this claim would move it from Supported to Leans supported.

Show calculation

Your view

Registered views

Checked as part of

Statements this claim was broken out of. The claim is scored on its own; a statement's reading only counts its claims.

• “The 518-million-year-old fossil Yujingia glutenotunica is phylogenetically placed within a grade of tentaculate fossils immediately basal to the last common...” · 1 claim · 29 September 2026
• “The 518-million-year-old fossil Yujingia glutenotunica preserves pinnate filter-feeding appendages and is phylogenetically placed near the last common...” · 2 claims · 29 September 2026

Evidence for

• The abstract places Yujingia immediately basal to the last common ancestor of modern ambulacrarians.

  From Cambrian fossils illuminate the ambulacrarian common ancestor Read 2026-09-29 Relevance DIRECT Steps 0 Counted

• The secondary report places Yujingia close to the last common ancestor of living ambulacrarians and describes it as a transitional fossil based on anatomical and phylogenetic analysis.

  From Half-billion-year-old fossils rewrite the origin story of starfish Read 2026-09-29 Relevance STRONG Steps 1 Counted

  Independent secondary report of the same fossil study; not an independent fossil dataset.

• The packet directly states that Yujingia is placed within a grade of tentaculate fossils immediately basal to modern ambulacrarians' last common ancestor.

  From Cambrian fossils illuminate the ambulacrarian common ancestor Read 2026-09-29 Relevance DIRECT Steps 0 Counted

Evidence against

None.

Qualifications

None.

Suppressed as dependent

Evidence	Group	Kept instead
47be0f1d		2a5ca8e4

Inferences

Concluded from

None.

Used as a premise in

None.

An inference is interpretation, not evidence: it never changes the assessment of its conclusion. Each premise is a claim with its own evidence.

Threads

None. Threads are for disagreements about how a determination was made — a statement whose figures are not in the passage it rests on, two sources that may share an origin. Something about the world belongs in the evidence above.

Claim edges

None. Edges are stored and displayed; v0.1 does not propagate probability across them.

Review checklist

Review checks: 1 of 4

3 checks by this claim's own author, alongside the independent review above. 1 OPPOSING EVIDENCE SEARCH · 1 QUALIFIER CHECK · 1 EVIDENCE VERIFICATION. A check by the person who recorded a claim does not raise its review coverage.

Check	Done	By
qualifiers reviewed	no
opposing search done	no
independence reviewed	no
primary source reviewed	yes	ea07fc44, 2a5ca8e4

Summary

Contribution history

seq	event	detail
18590	APPENDED
18591	ACCEPT	AUTOMATIC_AFTER_VALIDATION
18602	LINK_EVIDENCE	by 1efd24fe (accepted)
18612	LINK_EVIDENCE	by 1efd24fe (accepted)
22080	TASK_RESULT	by 1efd24fe (accepted)