Claim

The Dongoconodon specimen preserved multiple tooth generations across incisors, canines, premolars and molars, described as the first mammal known to show repeated replacement across all four broad tooth categories.

Type OBSERVATIONAL · truth-evaluable: yes · status at snapshot: ACTIVE · created seq 23992

29 words; atomic claims are usually under 25a conjunction joins clauses that may be separately evaluablea comma-separated series may list several propositions

Referenced 187 times: checked 2, looked up by assistants 0, viewed 121, shared 64. A count of attention, not evidence.

Topics

Biology · 1efd24fe Archaeology · 1efd24fe

Assessment

Supported

Score: 0.9734 under ledger-default@0.3.0 at snapshot 27745

2 of 4 review checks done · 0 counted · 2 by the author only

2 independent evidence lineages · review checks 0 of 4 · stability HIGH

Main unresolved issue: 2 counted evidence items have no independence review; repeats of one origin may be counted as several coverage:df776439-a93d-8a43-8d4f-11c856214319

Not yet independently audited.Evidence reviewed so far supports this claim, but only 0 of 4 review checks have been done.Every quoted passage was confirmed on the page when Galedra fetched it.

Why?

Strongest counted support: IT之家 reports replacement teeth from different generations across incisors, canines, premolars and molars in the specimen. weight 1.800000 evidence

Suppressed as dependent: IT之家 reports replacement teeth from different generations across incisors, canines, premolars and molars in the specimen.

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

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

Hide calculation

0.9734 under ledger-default@0.3.0 at snapshot 27745 · state Supported · Review checks: 0 of 4 · stability HIGH · 3 sources, 2 independent lineages

Model ledger-default@0.3.0 (the default model, not the answer) · snapshot 27745 · trace sha256:eb225ab1b02432bcf272d34738a620303b75296ee3cd53d41b6dde6862163bdc

Last changed at entry seq 25946; nothing logged since has borne on this claim.

How the number was reached

Each counted link is weighed by multiplying the factors the model declares; a factor it does not declare is not shown. Every factor name below links to what that number means.

Link	Working	Weight	Counted as
1d14e570 support	relevance DIRECT 2.0 × observation ARCHAEOLOGICAL 0.9 × interpretation 0 steps, 1 − 0.15 × 0 1.000000 × authenticity UNVERIFIED 1.0 × extraction UNVERIFIED 1.0 × provenance INDEPENDENT 1.0 × edition NAMED_OR_UNRELATED 1	1.800000	1.800000
3323d91e support	relevance DIRECT 2.0 × observation ARCHAEOLOGICAL 0.9 × interpretation 0 steps, 1 − 0.15 × 0 1.000000 × authenticity UNVERIFIED 1.0 × extraction UNVERIFIED 1.0 × provenance INDEPENDENT 1.0 × edition NAMED_OR_UNRELATED 1	1.800000	0.000000 (dependent strongest only, kept 1d14e570)
0e94731e support	relevance DIRECT 2.0 × observation DIRECT_TEXT 0.9 × interpretation 0 steps, 1 − 0.15 × 0 1.000000 × authenticity UNVERIFIED 1.0 × extraction UNVERIFIED 1.0 × provenance INDEPENDENT 1.0 × edition NAMED_OR_UNRELATED 1	1.800000	1.800000

prior 0.50 → log-odds 0.000000 + 3.600000 (the counted weights) = 3.600000 → probability 0.9734

Under neighbouring settings of the same model: 0.9255 to 0.9908, a spread of 0.0653.

Half-even rounding, six places for weights and four for the probability. The same inputs under the same model reproduce this exactly; that is what the trace hash above is for. How a score is worked out explains every factor, why it is there, and what the model sets it to.

Your view

Registered views

Nobody has registered a view yet.

Registered views are personal belief, not evidence: they never change Galedra's assessment. Affiliations are self-declared and shown only for groups of 5 or more.

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 Dongoconodon specimen preserved multiple tooth generations across incisors, canines, premolars and molars, described as the first mammal known to show...” · 1 claim · 29 September 2026
“The Dongoconodon specimen preserved repeated tooth replacement across all four broad mammalian tooth categories.” · 1 claim · 29 September 2026

Evidence for

IT之家 reports replacement teeth from different generations across incisors, canines, premolars and molars in the specimen.

From 中外学者确认最早半水生记录：1.25 亿年前哺乳动物就会游泳 Read 2026-09-29 Relevance DIRECT Steps 0 Counted
IT之家 reports replacement teeth from different generations across incisors, canines, premolars and molars in the specimen.

From 中外学者确认最早半水生记录：1.25 亿年前哺乳动物就会游泳 Read 2026-09-29 Relevance DIRECT Steps 0 Counted
凤凰网 reports different tooth generations across incisors, canines, premolars and molars, calling it the first mammal known with repeated replacement in all four categories.

From 南大科学家联合国内外学者最新发现：1.25亿年前的小型哺乳动物会游泳 Read 2026-09-29 Relevance DIRECT Steps 0 Counted

Evidence against

None.

Qualifications

None.

Suppressed as dependent

Evidence	Group	Kept instead
861826ce		1d14e570

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: 0 of 4

3 checks by this claim's own author. No independent review yet. 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	no

Summary

Supported. The main support is: IT之家 reports replacement teeth from different generations across incisors, canines, premolars and molars in the specimen. 861826ce

1 further item repeats the same origin and is not independent evidence. 861826ce

A search for evidence in the opposing direction found none. 3545aa2d

Review checks: 0 of 4. coverage:df776439-a93d-8a43-8d4f-11c856214319

Generated by stub-v0.1; every sentence cites graph ids.

Contribution history

seq	event	detail
23992	APPENDED
23993	ACCEPT	AUTOMATIC_AFTER_VALIDATION
23998	LINK_EVIDENCE	by 1efd24fe (accepted)
24001	TASK_RESULT	by 1efd24fe (accepted)
24021	LINK_EVIDENCE	by 1efd24fe (accepted)

Score trace

{
  "claim": "df776439-a93d-8a43-8d4f-11c856214319",
  "links": [
    {
      "link": "1634c79a-ed7d-8905-8aab-3dd31d14e570",
      "group": null,
      "edition": "NAMED_OR_UNRELATED",
      "evidence": "7e33e688-5b80-8052-9809-d2b6861826ce",
      "direction": "SUPPORT",
      "magnitude": "1.800000",
      "relevance": "DIRECT",
      "extraction": "UNVERIFIED",
      "provenance": "INDEPENDENT",
      "observation": "ARCHAEOLOGICAL",
      "source_type": "SECONDARY_TEXT",
      "authenticity": "UNVERIFIED",
      "audit_confirmed": false,
      "effective_weight": "1.800000",
      "interpretive_steps": 0
    },
    {
      "kept": "1634c79a-ed7d-8905-8aab-3dd31d14e570",
      "link": "7319bc7b-7ac9-8079-82e0-dddf3323d91e",
      "group": null,
      "reason": "dependent_strongest_only",
      "edition": "NAMED_OR_UNRELATED",
      "evidence": "7e33e688-5b80-8052-9809-d2b6861826ce",
      "direction": "SUPPORT",
      "magnitude": "1.800000",
      "relevance": "DIRECT",
      "extraction": "UNVERIFIED",
      "provenance": "INDEPENDENT",
      "observation": "ARCHAEOLOGICAL",
      "source_type": "SECONDARY_TEXT",
      "authenticity": "UNVERIFIED",
      "audit_confirmed": false,
      "effective_weight": "0.000000",
      "interpretive_steps": 0
    },
    {
      "link": "90cb857b-0e2f-8988-8f96-aa450e94731e",
      "group": null,
      "edition": "NAMED_OR_UNRELATED",
      "evidence": "497420e6-c677-8c7d-8e5f-035e6b87bf4b",
      "direction": "SUPPORT",
      "magnitude": "1.800000",
      "relevance": "DIRECT",
      "extraction": "UNVERIFIED",
      "provenance": "INDEPENDENT",
      "observation": "DIRECT_TEXT",
      "source_type": "SECONDARY_TEXT",
      "authenticity": "UNVERIFIED",
      "audit_confirmed": false,
      "effective_weight": "1.800000",
      "interpretive_steps": 0
    }
  ],
  "model": "ledger-default@0.3.0",
  "prior": "0.50",
  "variants": {
    "spread": "0.0653",
    "permissive": "0.9908",
    "conservative": "0.9255"
  },
  "code_hash": "sha256:c61a6fdf35a754a0d7e958df149036a083c0eaeb7d2d2e52704ec32b0c36def7",
  "contested": false,
  "stability": "HIGH",
  "claim_type": "OBSERVATIONAL",
  "config_hash": "sha256:86768038080b8ab5233f1e4b7aba10af05b5bb44caa432095150b90e81209809",
  "probability": "0.9734",
  "provisional": true,
  "evidence_sum": "3.600000",
  "snapshot_seq": 25946,
  "prior_log_odds": "0.000000",
  "support_groups": 2,
  "model_dependent": false,
  "review_coverage": "0.00",
  "truth_evaluable": true,
  "assessment_state": "SUPPORTED",
  "review_checklist": {
    "qualifiers_reviewed": {
      "by": [],
      "ok": false
    },
    "opposing_search_done": {
      "by": [],
      "ok": false
    },
    "independence_reviewed": {
      "by": [],
      "ok": false
    },
    "primary_source_reviewed": {
      "by": [],
      "ok": false
    }
  },
  "contradict_groups": 0,
  "rounding_boundary": false,
  "posterior_log_odds": "3.600000",
  "not_applicable_reason": null,
  "independence_unreviewed": 2
}