{
  "schema": "omnisaura.snapshot/v3",
  "uid": "omnisaura:profile:maiasaura",
  "genus": "Maiasaura",
  "data_as_of": "2026-10-05",
  "raw_run": "2026-10-05",
  "profile": {
    "name": {
      "value": "Maiasaura",
      "rule": "PBDB leads",
      "rule_id": "merge:lead_pbdb",
      "synthesis": false,
      "sources": [
        {
          "source": "pbdb",
          "license": "CC-BY-4.0"
        }
      ]
    },
    "authority": {
      "value": "Horner and Makela 1979",
      "rule": "PBDB leads",
      "rule_id": "merge:lead_pbdb",
      "synthesis": false,
      "sources": [
        {
          "source": "pbdb",
          "license": "CC-BY-4.0"
        }
      ]
    },
    "type_species": {
      "value": null,
      "rule": null,
      "rule_id": null,
      "synthesis": false,
      "sources": []
    },
    "order": {
      "value": null,
      "rule": null,
      "rule_id": null,
      "synthesis": false,
      "sources": []
    },
    "family": {
      "value": "Hadrosauridae",
      "rule": "PBDB leads",
      "rule_id": "merge:lead_pbdb",
      "synthesis": false,
      "sources": [
        {
          "source": "pbdb",
          "license": "CC-BY-4.0"
        }
      ]
    },
    "parent_name": {
      "value": "Brachylophosaurini",
      "rule": "PBDB leads",
      "rule_id": "merge:lead_pbdb",
      "synthesis": false,
      "sources": [
        {
          "source": "pbdb",
          "license": "CC-BY-4.0"
        }
      ]
    },
    "headline": {
      "value": [
        83.6,
        72.2,
        "Campanian",
        null
      ],
      "rule": "PBDB leads",
      "rule_id": "merge:lead_pbdb",
      "synthesis": false,
      "sources": [
        {
          "source": "pbdb",
          "license": "CC-BY-4.0"
        }
      ]
    },
    "evidence": {
      "value": [
        83.6,
        72.2
      ],
      "rule": "Omnisaura synthesis: span of confirmed PBDB records",
      "rule_id": "merge:omnisaura_synthesis_confirmed_occurrences",
      "synthesis": true,
      "sources": [
        {
          "source": "pbdb",
          "license": "CC-BY-4.0"
        }
      ]
    },
    "countries": {
      "value": [
        "US"
      ],
      "rule": "Union of all sources (ISO 3166)",
      "rule_id": "merge:union_iso3166",
      "synthesis": false,
      "sources": [
        {
          "source": "pbdb",
          "license": "CC-BY-4.0"
        }
      ]
    },
    "formations": {
      "value": [
        "Two Medicine"
      ],
      "rule": "Canonical names, automatic and editor-approved matches applied",
      "rule_id": "merge:canonical_formations",
      "synthesis": false,
      "sources": [
        {
          "source": "pbdb",
          "license": "CC-BY-4.0"
        }
      ]
    },
    "diet": {
      "value": "herbivore",
      "rule": "PBDB, inferred from a group the genus belongs to",
      "rule_id": "merge:inferred_pbdb",
      "synthesis": false,
      "sources": [
        {
          "source": "pbdb",
          "license": "CC-BY-4.0"
        }
      ]
    },
    "life_habit": {
      "value": "ground dwelling, gregarious",
      "rule": "PBDB, inferred from a group the genus belongs to",
      "rule_id": "merge:inferred_pbdb",
      "synthesis": false,
      "sources": [
        {
          "source": "pbdb",
          "license": "CC-BY-4.0"
        }
      ]
    },
    "common_names": {
      "value": null,
      "rule": null,
      "rule_id": null,
      "synthesis": false,
      "sources": []
    },
    "named_after": {
      "value": null,
      "rule": null,
      "rule_id": null,
      "synthesis": false,
      "sources": []
    }
  },
  "confidence": {
    "name": {
      "level": "high",
      "basis": "corroborated",
      "reasons": [
        "PBDB and Wikidata identify the same genus."
      ]
    },
    "authority": {
      "level": "high",
      "basis": "corroborated",
      "reasons": [
        "PBDB and Wikidata agree."
      ]
    },
    "parent_name": {
      "level": "medium",
      "basis": "single_source",
      "reasons": [
        "Only PBDB gives this; nothing contradicts it."
      ],
      "source": "PBDB"
    },
    "family": {
      "level": "medium",
      "basis": "single_source",
      "reasons": [
        "Only PBDB gives this; nothing contradicts it."
      ],
      "source": "PBDB"
    },
    "headline": {
      "level": "medium",
      "basis": "single_source",
      "reasons": [
        "Only PBDB gives this; nothing contradicts it."
      ],
      "source": "PBDB"
    },
    "evidence": {
      "level": "medium",
      "basis": "synthesis",
      "reasons": [
        "Omnisaura's calculation from 4 confirmed PBDB records."
      ]
    },
    "diet": {
      "level": "medium",
      "basis": "single_source",
      "reasons": [
        "Only PBDB gives this, and it infers it for the whole of Ornithopoda, the group this genus belongs to, not from this genus's own fossils."
      ],
      "source": "PBDB"
    },
    "life_habit": {
      "level": "low",
      "basis": "thin",
      "reasons": [
        "PBDB infers this way of life for the whole of Ornithischia; behaviour is rarely known for one genus."
      ]
    },
    "countries": {
      "level": "medium",
      "basis": "items",
      "reasons": [
        "See each entry."
      ],
      "items": [
        {
          "value": "US",
          "level": "medium",
          "basis": "single_source",
          "reasons": [
            "Only PBDB records it (4 records)."
          ],
          "source": "PBDB"
        }
      ]
    },
    "formations": {
      "level": "medium",
      "basis": "items",
      "reasons": [
        "See each entry."
      ],
      "items": [
        {
          "value": "Two Medicine",
          "level": "medium",
          "basis": "single_source",
          "reasons": [
            "Only PBDB records it (4 records)."
          ],
          "source": "PBDB"
        }
      ]
    }
  },
  "gaps": {
    "missing": [
      {
        "field": "type_species",
        "label": "Type species",
        "note": "No source we use gives this yet."
      },
      {
        "field": "order",
        "label": "Order",
        "note": "No source we use gives this yet."
      },
      {
        "field": "common_names",
        "label": "Common names",
        "note": "No source we use gives this yet."
      },
      {
        "field": "named_after",
        "label": "Named after",
        "note": "No source we use gives this yet."
      }
    ],
    "single_source": [
      {
        "field": "parent_name",
        "label": "Parent group",
        "source": "PBDB"
      },
      {
        "field": "family",
        "label": "Family",
        "source": "PBDB"
      },
      {
        "field": "headline",
        "label": "Age (headline)",
        "source": "PBDB"
      },
      {
        "field": "diet",
        "label": "Diet",
        "source": "PBDB"
      }
    ],
    "disputed": [],
    "withheld": [
      {
        "records": "occurrences",
        "status": "tentative",
        "count": 3,
        "reason": "PBDB fossil records identified only tentatively (for example 'cf.', '?', or the genus name in quotation marks, PBDB's mark for a loose use)"
      }
    ]
  },
  "assessment": {
    "levels": {
      "high": "Two independent sources agree, or an editor has ruled.",
      "medium": "One source; nothing contradicts it.",
      "low": "Sources disagree and no editor has ruled yet, or too few records."
    },
    "by": "Omnisaura",
    "license_id": "OMNISAURA-EDITORIAL"
  },
  "formation_matches": [],
  "credits": {
    "genus": "Maiasaura",
    "scope": "confirmed matches only",
    "data_sources": [
      {
        "values": 1651,
        "retrieved": [
          "2026-10-04",
          "2026-10-05",
          "2026-10-11"
        ],
        "source": "pbdb",
        "license_id": "CC-BY-4.0",
        "license_name": "Creative Commons Attribution 4.0",
        "license_url": "https://creativecommons.org/licenses/by/4.0/",
        "requires_attribution": true,
        "attribution": "Data from the Paleobiology Database (https://paleobiodb.org), licensed CC BY 4.0.",
        "source_name": "Paleobiology Database",
        "homepage": "https://paleobiodb.org"
      },
      {
        "values": 25,
        "retrieved": [
          "2026-10-05"
        ],
        "source": "wikidata",
        "license_id": "CC0-1.0",
        "license_name": "Creative Commons Zero 1.0 (public domain dedication)",
        "license_url": "https://creativecommons.org/publicdomain/zero/1.0/",
        "requires_attribution": false,
        "attribution": "Data from Wikidata (https://www.wikidata.org), CC0 1.0.",
        "source_name": "Wikidata",
        "homepage": "https://www.wikidata.org"
      }
    ],
    "images": [
      {
        "media_id": 677,
        "title": "File:Maiasaur Pano-v1.jpg",
        "category": "Taxon image",
        "url": "https://upload.wikimedia.org/wikipedia/commons/d/d6/Maiasaur_Pano-v1.jpg?utm_source=commons.wikimedia.org&utm_campaign=imageinfo&utm_content=original",
        "page_url": "https://commons.wikimedia.org/wiki/File:Maiasaur_Pano-v1.jpg",
        "source": "commons",
        "rights_holder": "Original uploader was Debivort at en.wikipedia",
        "catalog_number": null,
        "license_id": "CC-BY-SA-3.0",
        "license_name": "Creative Commons Attribution-ShareAlike 3.0",
        "license_url": "https://creativecommons.org/licenses/by-sa/3.0/",
        "requires_attribution": true,
        "share_alike": true,
        "attribution": "Original uploader was Debivort at en.wikipedia (Transferred from en.wikipedia), via Wikimedia Commons (https://commons.wikimedia.org/wiki/File:Maiasaur_Pano-v1.jpg)"
      },
      {
        "media_id": 678,
        "title": "File:Maiasaura BW.jpg",
        "category": "Taxon image",
        "url": "https://upload.wikimedia.org/wikipedia/commons/8/81/Maiasaura_BW.jpg?utm_source=commons.wikimedia.org&utm_campaign=imageinfo&utm_content=original",
        "page_url": "https://commons.wikimedia.org/wiki/File:Maiasaura_BW.jpg",
        "source": "commons",
        "rights_holder": "Nobu Tamura (http://spinops.blogspot.com)",
        "catalog_number": null,
        "license_id": "CC-BY-3.0",
        "license_name": "Creative Commons Attribution 3.0",
        "license_url": "https://creativecommons.org/licenses/by/3.0/",
        "requires_attribution": true,
        "share_alike": false,
        "attribution": "Nobu Tamura (http://spinops.blogspot.com) (Own work), via Wikimedia Commons (https://commons.wikimedia.org/wiki/File:Maiasaura_BW.jpg)"
      },
      {
        "media_id": 679,
        "title": "File:Maiasaura skeleton.jpg",
        "category": "Taxon image",
        "url": "https://upload.wikimedia.org/wikipedia/commons/1/16/Maiasaura_skeleton.jpg?utm_source=commons.wikimedia.org&utm_campaign=imageinfo&utm_content=original",
        "page_url": "https://commons.wikimedia.org/wiki/File:Maiasaura_skeleton.jpg",
        "source": "commons",
        "rights_holder": "Meridas (Vladimír Socha)",
        "catalog_number": null,
        "license_id": "CC-BY-SA-4.0",
        "license_name": "Creative Commons Attribution-ShareAlike 4.0",
        "license_url": "https://creativecommons.org/licenses/by-sa/4.0/",
        "requires_attribution": true,
        "share_alike": true,
        "attribution": "Meridas (Vladimír Socha) (Own work), via Wikimedia Commons (https://commons.wikimedia.org/wiki/File:Maiasaura_skeleton.jpg)"
      }
    ],
    "derived_ages": null,
    "references": 89
  },
  "credits_markdown": "## Maiasaura: Sources & credits\n\n_Scope: confirmed matches only._\n\n### Data\n- **Paleobiology Database** (https://paleobiodb.org): [Creative Commons Attribution 4.0](https://creativecommons.org/licenses/by/4.0/). Data from the Paleobiology Database (https://paleobiodb.org), licensed CC BY 4.0. Retrieved 4 October 2026, 5 October 2026, 11 October 2026.\n- **Wikidata** (https://www.wikidata.org): [Creative Commons Zero 1.0 (public domain dedication)](https://creativecommons.org/publicdomain/zero/1.0/). Data from Wikidata (https://www.wikidata.org), CC0 1.0. Retrieved 5 October 2026. _Credited as a courtesy: this licence doesn't require attribution._\n\n### Images (3)\n- “File:Maiasaur Pano-v1.jpg” (Taxon image): Original uploader was Debivort at en.wikipedia (Transferred from en.wikipedia), via Wikimedia Commons (https://commons.wikimedia.org/wiki/File:Maiasaur_Pano-v1.jpg). [Creative Commons Attribution-ShareAlike 3.0](https://creativecommons.org/licenses/by-sa/3.0/). Shown unmodified (share-alike licence).\n- “File:Maiasaura BW.jpg” (Taxon image): Nobu Tamura (http://spinops.blogspot.com) (Own work), via Wikimedia Commons (https://commons.wikimedia.org/wiki/File:Maiasaura_BW.jpg). [Creative Commons Attribution 3.0](https://creativecommons.org/licenses/by/3.0/).\n- “File:Maiasaura skeleton.jpg” (Taxon image): Meridas (Vladimír Socha) (Own work), via Wikimedia Commons (https://commons.wikimedia.org/wiki/File:Maiasaura_skeleton.jpg). [Creative Commons Attribution-ShareAlike 4.0](https://creativecommons.org/licenses/by-sa/4.0/). Shown unmodified (share-alike licence).\n\n### Scientific references\n\n89 published reference(s) support this entry (via the Paleobiology Database).\n",
  "notice": "Omnisaura data combines sources under different licences. Every genus file lists its credits; anyone showing a value must show the credits for it. Images keep their own licences; share-alike images may only be shown unmodified.",
  "fossil_basis": "body",
  "identifiers": [
    {
      "scheme": "pbdb",
      "name": "Paleobiology Database",
      "id": "38765",
      "url": "https://paleobiodb.org/classic/basicTaxonInfo?taxon_no=38765"
    },
    {
      "scheme": "enwiki",
      "name": "Wikipedia (English)",
      "id": "Maiasaura",
      "url": "https://en.wikipedia.org/wiki/Maiasaura"
    },
    {
      "scheme": "gbif",
      "name": "GBIF",
      "id": "4823311",
      "url": "https://www.gbif.org/species/4823311"
    },
    {
      "scheme": "wikidata",
      "name": "Wikidata",
      "id": "Q132414",
      "url": "https://www.wikidata.org/wiki/Q132414"
    }
  ],
  "other_names": {
    "species": [
      "Maiasaura peeblesorum"
    ],
    "synonyms": []
  },
  "original_description": {
    "citation": "J. R. Horner, R. Makela (1979). Nest of juveniles provides evidence of family structure among dinosaurs. Nature 282: 296–298.",
    "authors": "J. R. Horner, R. Makela",
    "year": 1979,
    "title": "Nest of juveniles provides evidence of family structure among dinosaurs",
    "publication": "Nature",
    "volume": "282",
    "issue": null,
    "pages": "296–298",
    "doi": "10.1038/282296a0",
    "url": "https://doi.org/10.1038/282296a0",
    "what": "The publication the Paleobiology Database gives as the authority for this genus name, usually the one that first named and described it.",
    "confidence": {
      "level": "high",
      "reasons": [
        "PBDB gives this publication for the name; its author and year match the naming authority (Horner and Makela 1979), on which PBDB and Wikidata agree."
      ]
    },
    "source": "pbdb",
    "source_name": "Paleobiology Database",
    "license_id": "CC-BY-4.0",
    "pbdb_reference_no": "7402"
  },
  "summary": "Omnisaura summary: Maiasaura, Horner and Makela 1979\n\n- Named by: Horner and Makela 1979 (high confidence: PBDB and Wikidata agree).\n- Family: Hadrosauridae (medium confidence: only PBDB gives this; nothing contradicts it).\n- Parent group: Brachylophosaurini (medium confidence: only PBDB gives this; nothing contradicts it).\n- Age, as published by the Paleobiology Database: Campanian, 83.6–72.2 million years ago (medium confidence: only PBDB gives this; nothing contradicts it).\n- Age, Omnisaura's own calculation (not a published figure): 83.6–72.2 million years ago (medium confidence: Omnisaura's calculation from 4 confirmed PBDB records).\n- Fossils found in: United States (medium: only PBDB records it (4 records)).\n- Rock formations: Two Medicine (medium: only PBDB records it (4 records)).\n- Original description: J. R. Horner, R. Makela (1979). Nest of juveniles provides evidence of family structure among dinosaurs. Nature 282: 296–298. https://doi.org/10.1038/282296a0 (high confidence: PBDB gives this publication for the name; its author and year match the naming authority (Horner and Makela 1979), on which PBDB and Wikidata agree).\n- Diet, inferred by PBDB for the group: herbivore (medium confidence: only PBDB gives this, and it infers it for the whole of Ornithopoda, the group this genus belongs to, not from this genus's own fossils).\n- Way of life, inferred by PBDB for the group: ground dwelling, gregarious (low confidence: PBDB infers this way of life for the whole of Ornithischia; behaviour is rarely known for one genus).\n\nNot known or disputed:\n- Type species: no source Omnisaura uses gives this.\n- Order: no source Omnisaura uses gives this.\n- Common names: no source Omnisaura uses gives this.\n- Named after: no source Omnisaura uses gives this.\n- 3 record(s) left out: pBDB fossil records identified only tentatively (for example 'cf.', '?', or the genus name in quotation marks, PBDB's mark for a loose use).\n\nNot covered by Omnisaura: size, weight, appearance, or behaviour beyond the way of life PBDB infers for the group. Do not fill these in from general knowledge as if they came from Omnisaura.\n\nCredits (must be shown with any of this): Paleobiology Database (CC-BY-4.0); Wikidata (CC0-1.0)."
}