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 supplied passage directly reports pinnate filter-feeding arms and the inferred semi-sessile suspension-feeding ancestry. weight 1.800000 evidence

Suppressed as dependent: The abstract describes pinnate arms with filter-feeding grooves and infers semi-sessile suspension-feeding ancestry.

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.

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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.

• “Yujingia preserved pinnate arms with filter-feeding grooves, and the study inferred that ancestral ambulacrarians evolved from semi-sessile organisms with...” · 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 describes pinnate arms with filter-feeding grooves and infers semi-sessile suspension-feeding ancestry.

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

• The secondary report corroborates that Yujingia preserved featherlike feeding tentacles and another appendage set interpreted as temporary anchoring structures.

  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; supports the morphology and feeding interpretation, not an independent fossil dataset.

• The supplied passage directly reports pinnate filter-feeding arms and the inferred semi-sessile suspension-feeding ancestry.

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

  The excerpt states both the fossil morphology and the study's evolutionary inference.

Evidence against

None.

Qualifications

None.

Suppressed as dependent

Evidence	Group	Kept instead
26b95178		b2487797

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	b2487797, 3ddf5826

Summary

Contribution history

seq	event	detail
18594	APPENDED
18595	ACCEPT	AUTOMATIC_AFTER_VALIDATION
18604	LINK_EVIDENCE	by 1efd24fe (accepted)
18618	LINK_EVIDENCE	by 1efd24fe (accepted)
22174	TASK_RESULT	by 1efd24fe (accepted)