{
  "schema": "omnisaura.snapshot/v3",
  "uid": "omnisaura:profile:mamenchisaurus",
  "genus": "Mamenchisaurus",
  "data_as_of": "2026-10-05",
  "raw_run": "2026-10-05",
  "profile": {
    "name": {
      "value": "Mamenchisaurus",
      "rule": "PBDB leads",
      "rule_id": "merge:lead_pbdb",
      "synthesis": false,
      "sources": [
        {
          "source": "pbdb",
          "license": "CC-BY-4.0"
        }
      ]
    },
    "authority": {
      "value": "Young 1954",
      "rule": "PBDB leads",
      "rule_id": "merge:lead_pbdb",
      "synthesis": false,
      "sources": [
        {
          "source": "pbdb",
          "license": "CC-BY-4.0"
        }
      ]
    },
    "type_species": {
      "value": "Mamenchisaurus constructus",
      "rule": "PBDB leads",
      "rule_id": "merge:lead_pbdb",
      "synthesis": false,
      "sources": [
        {
          "source": "pbdb",
          "license": "CC-BY-4.0"
        }
      ]
    },
    "order": {
      "value": null,
      "rule": null,
      "rule_id": null,
      "synthesis": false,
      "sources": []
    },
    "family": {
      "value": "Mamenchisauridae",
      "rule": "PBDB leads",
      "rule_id": "merge:lead_pbdb",
      "synthesis": false,
      "sources": [
        {
          "source": "pbdb",
          "license": "CC-BY-4.0"
        }
      ]
    },
    "parent_name": {
      "value": "Mamenchisauridae",
      "rule": "PBDB leads",
      "rule_id": "merge:lead_pbdb",
      "synthesis": false,
      "sources": [
        {
          "source": "pbdb",
          "license": "CC-BY-4.0"
        }
      ]
    },
    "headline": {
      "value": [
        168.2,
        113.2,
        "Bathonian",
        "Aptian"
      ],
      "rule": "PBDB leads",
      "rule_id": "merge:lead_pbdb",
      "synthesis": false,
      "sources": [
        {
          "source": "pbdb",
          "license": "CC-BY-4.0"
        }
      ]
    },
    "evidence": {
      "value": [
        168.2,
        113.2
      ],
      "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": [
        "CN",
        "MN",
        "TH"
      ],
      "rule": "Union of all sources (ISO 3166)",
      "rule_id": "merge:union_iso3166",
      "synthesis": false,
      "sources": [
        {
          "source": "pbdb",
          "license": "CC-BY-4.0"
        }
      ]
    },
    "formations": {
      "value": [
        "Dariv",
        "Penglaizhen",
        "Phu Kradung",
        "Shaximiao",
        "Shishugou",
        "Suining",
        "Upper Shaximiao",
        "Xiangtang"
      ],
      "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": [
        "ja:マメンチサウルス",
        "zh:馬門溪龍"
      ],
      "rule": "Wikidata leads",
      "rule_id": "merge:lead_wikidata",
      "synthesis": false,
      "sources": [
        {
          "source": "wikidata",
          "license": "CC0-1.0"
        }
      ]
    },
    "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": "medium",
      "basis": "single_source",
      "reasons": [
        "Only PBDB gives this; nothing contradicts it."
      ],
      "source": "PBDB"
    },
    "type_species": {
      "level": "medium",
      "basis": "single_source",
      "reasons": [
        "Only PBDB gives this; nothing contradicts it."
      ],
      "source": "PBDB"
    },
    "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 17 confirmed PBDB records."
      ]
    },
    "common_names": {
      "level": "medium",
      "basis": "single_source",
      "reasons": [
        "Only Wikidata gives this; nothing contradicts it."
      ],
      "source": "Wikidata"
    },
    "diet": {
      "level": "medium",
      "basis": "single_source",
      "reasons": [
        "Only PBDB gives this, and it infers it for the whole of Sauropoda, 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 Sauropoda; behaviour is rarely known for one genus."
      ]
    },
    "countries": {
      "level": "mixed",
      "basis": "items",
      "reasons": [
        "Entries differ; see each entry."
      ],
      "items": [
        {
          "value": "CN",
          "level": "medium",
          "basis": "single_source",
          "reasons": [
            "Only PBDB records it (15 records)."
          ],
          "source": "PBDB"
        },
        {
          "value": "MN",
          "level": "low",
          "basis": "thin",
          "reasons": [
            "Only one PBDB record."
          ]
        },
        {
          "value": "TH",
          "level": "low",
          "basis": "thin",
          "reasons": [
            "Only one PBDB record."
          ]
        }
      ]
    },
    "formations": {
      "level": "mixed",
      "basis": "items",
      "reasons": [
        "Entries differ; see each entry."
      ],
      "items": [
        {
          "value": "Dariv",
          "level": "low",
          "basis": "thin",
          "reasons": [
            "Only one PBDB record."
          ]
        },
        {
          "value": "Penglaizhen",
          "level": "low",
          "basis": "thin",
          "reasons": [
            "Only one PBDB record."
          ]
        },
        {
          "value": "Phu Kradung",
          "level": "low",
          "basis": "thin",
          "reasons": [
            "Only one PBDB record."
          ]
        },
        {
          "value": "Shaximiao",
          "level": "medium",
          "basis": "single_source",
          "reasons": [
            "Only PBDB records it (8 records)."
          ],
          "source": "PBDB"
        },
        {
          "value": "Shishugou",
          "level": "low",
          "basis": "thin",
          "reasons": [
            "Only one PBDB record."
          ]
        },
        {
          "value": "Suining",
          "level": "low",
          "basis": "thin",
          "reasons": [
            "Only one PBDB record."
          ]
        },
        {
          "value": "Upper Shaximiao",
          "level": "low",
          "basis": "thin",
          "reasons": [
            "Only one PBDB record."
          ]
        },
        {
          "value": "Xiangtang",
          "level": "medium",
          "basis": "single_source",
          "reasons": [
            "Only PBDB records it (2 records)."
          ],
          "source": "PBDB"
        }
      ]
    }
  },
  "gaps": {
    "missing": [
      {
        "field": "order",
        "label": "Order",
        "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": "authority",
        "label": "Authority",
        "source": "PBDB"
      },
      {
        "field": "type_species",
        "label": "Type species",
        "source": "PBDB"
      },
      {
        "field": "parent_name",
        "label": "Parent group",
        "source": "PBDB"
      },
      {
        "field": "family",
        "label": "Family",
        "source": "PBDB"
      },
      {
        "field": "headline",
        "label": "Age (headline)",
        "source": "PBDB"
      },
      {
        "field": "common_names",
        "label": "Common names",
        "source": "Wikidata"
      },
      {
        "field": "diet",
        "label": "Diet",
        "source": "PBDB"
      }
    ],
    "disputed": [],
    "withheld": [
      {
        "records": "occurrences",
        "status": "tentative",
        "count": 7,
        "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": "Mamenchisaurus",
    "scope": "confirmed matches only",
    "data_sources": [
      {
        "values": 2147,
        "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": 32,
        "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": 667,
        "title": "File:Mamenchisaurus hochuanensis sauropod dinosaur (Shangshaximiao Formation, Upper Jurassic; Gushushan, NW of Hechuan, southwestern Chongqing Municipality, south-central China) 2 (15407361402).jpg",
        "category": "Taxon image",
        "url": "https://upload.wikimedia.org/wikipedia/commons/6/6c/Mamenchisaurus_hochuanensis_sauropod_dinosaur_%28Shangshaximiao_Formation%2C_Upper_Jurassic%3B_Gushushan%2C_NW_of_Hechuan%2C_southwestern_Chongqing_Municipality%2C_south-central_China%29_2_%2815407361402%29.jpg?utm_source=commons.wikimedia.org&utm_campaign=imageinfo&utm_content=original",
        "page_url": "https://commons.wikimedia.org/wiki/File:Mamenchisaurus_hochuanensis_sauropod_dinosaur_(Shangshaximiao_Formation,_Upper_Jurassic;_Gushushan,_NW_of_Hechuan,_southwestern_Chongqing_Municipality,_south-central_China)_2_(15407361402).jpg",
        "source": "commons",
        "rights_holder": "James St. John",
        "catalog_number": null,
        "license_id": "CC-BY-2.0",
        "license_name": "Creative Commons Attribution 2.0",
        "license_url": "https://creativecommons.org/licenses/by/2.0/",
        "requires_attribution": true,
        "share_alike": false,
        "attribution": "James St. John (Mamenchisaurus hochuanensis sauropod dinosaur (Shangshaximiao Formation, Upper Jurassic; Gushushan, NW of Hechuan, southwestern Chongqing Municipality, south-central China) 2), via Wikimedia Commons (https://commons.wikimedia.org/wiki/File:Mamenchisaurus_hochuanensis_sauropod_dinosaur_(Shangshaximiao_Formation,_Upper_Jurassic;_Gushushan,_NW_of_Hechuan,_southwestern_Chongqing_Municipality,_south-central_China)_2_(15407361402).jpg)"
      },
      {
        "media_id": 668,
        "title": "File:Mamenchisaurus youngi steveoc 86.jpg",
        "category": "Taxon image",
        "url": "https://upload.wikimedia.org/wikipedia/commons/3/35/Mamenchisaurus_youngi_steveoc_86.jpg?utm_source=commons.wikimedia.org&utm_campaign=imageinfo&utm_content=original",
        "page_url": "https://commons.wikimedia.org/wiki/File:Mamenchisaurus_youngi_steveoc_86.jpg",
        "source": "commons",
        "rights_holder": "Steveoc 86",
        "catalog_number": null,
        "license_id": "CC-BY-SA-2.5",
        "license_name": "Creative Commons Attribution-ShareAlike 2.5",
        "license_url": "https://creativecommons.org/licenses/by-sa/2.5/",
        "requires_attribution": true,
        "share_alike": true,
        "attribution": "Steveoc 86 (Own work), via Wikimedia Commons (https://commons.wikimedia.org/wiki/File:Mamenchisaurus_youngi_steveoc_86.jpg)"
      }
    ],
    "derived_ages": null,
    "references": 93
  },
  "credits_markdown": "## Mamenchisaurus: 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 (2)\n- “File:Mamenchisaurus hochuanensis sauropod dinosaur (Shangshaximiao Formation, Upper Jurassic; Gushushan, NW of Hechuan, southwestern Chongqing Municipality, south-central China) 2 (15407361402).jpg” (Taxon image): James St. John (Mamenchisaurus hochuanensis sauropod dinosaur (Shangshaximiao Formation, Upper Jurassic; Gushushan, NW of Hechuan, southwestern Chongqing Municipality, south-central China) 2), via Wikimedia Commons (https://commons.wikimedia.org/wiki/File:Mamenchisaurus_hochuanensis_sauropod_dinosaur_(Shangshaximiao_Formation,_Upper_Jurassic;_Gushushan,_NW_of_Hechuan,_southwestern_Chongqing_Municipality,_south-central_China)_2_(15407361402).jpg). [Creative Commons Attribution 2.0](https://creativecommons.org/licenses/by/2.0/).\n- “File:Mamenchisaurus youngi steveoc 86.jpg” (Taxon image): Steveoc 86 (Own work), via Wikimedia Commons (https://commons.wikimedia.org/wiki/File:Mamenchisaurus_youngi_steveoc_86.jpg). [Creative Commons Attribution-ShareAlike 2.5](https://creativecommons.org/licenses/by-sa/2.5/). Shown unmodified (share-alike licence).\n\n### Scientific references\n\n93 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": "38670",
      "url": "https://paleobiodb.org/classic/basicTaxonInfo?taxon_no=38670"
    },
    {
      "scheme": "enwiki",
      "name": "Wikipedia (English)",
      "id": "Mamenchisaurus",
      "url": "https://en.wikipedia.org/wiki/Mamenchisaurus"
    },
    {
      "scheme": "gbif",
      "name": "GBIF",
      "id": "4822602",
      "url": "https://www.gbif.org/species/4822602"
    },
    {
      "scheme": "wikidata",
      "name": "Wikidata",
      "id": "Q131038",
      "url": "https://www.wikidata.org/wiki/Q131038"
    }
  ],
  "other_names": {
    "species": [
      "Mamenchisaurus anyuensis",
      "Mamenchisaurus constructus",
      "Mamenchisaurus hochuanensis",
      "Mamenchisaurus jingyanensis",
      "Mamenchisaurus sanjiangensis",
      "Mamenchisaurus sinocanadorum",
      "Mamenchisaurus youngi"
    ],
    "synonyms": []
  },
  "original_description": {
    "citation": "C.-C. Young (1954). On a new sauropod from Yiping, Szechuan, China. Acta Paleontologica Sinica 2(4): 355–369.",
    "authors": "C.-C. Young",
    "year": 1954,
    "title": "On a new sauropod from Yiping, Szechuan, China",
    "publication": "Acta Paleontologica Sinica",
    "volume": "2",
    "issue": "4",
    "pages": "355–369",
    "doi": null,
    "url": null,
    "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": "medium",
      "reasons": [
        "Only PBDB gives this; its author and year match the naming authority (Young 1954)."
      ]
    },
    "source": "pbdb",
    "source_name": "Paleobiology Database",
    "license_id": "CC-BY-4.0",
    "pbdb_reference_no": "24276"
  },
  "summary": "Omnisaura summary: Mamenchisaurus, Young 1954\n\n- Named by: Young 1954 (medium confidence: only PBDB gives this; nothing contradicts it).\n- Family: Mamenchisauridae (medium confidence: only PBDB gives this; nothing contradicts it).\n- Parent group: Mamenchisauridae (medium confidence: only PBDB gives this; nothing contradicts it).\n- Type species: Mamenchisaurus constructus (medium confidence: only PBDB gives this; nothing contradicts it).\n- Age, as published by the Paleobiology Database: Bathonian to Aptian, 168.2–113.2 million years ago (medium confidence: only PBDB gives this; nothing contradicts it).\n- Age, Omnisaura's own calculation (not a published figure): 168.2–113.2 million years ago (medium confidence: Omnisaura's calculation from 17 confirmed PBDB records).\n- Fossils found in: China (medium: only PBDB records it (15 records)); Mongolia (low: only one PBDB record); Thailand (low: only one PBDB record).\n- Rock formations: Shaximiao (medium: only PBDB records it (8 records)); Xiangtang (medium: only PBDB records it (2 records)); Dariv (low: only one PBDB record); Penglaizhen (low: only one PBDB record); Phu Kradung (low: only one PBDB record); Shishugou (low: only one PBDB record); Suining (low: only one PBDB record); Upper Shaximiao (low: only one PBDB record).\n- Original description: C.-C. Young (1954). On a new sauropod from Yiping, Szechuan, China. Acta Paleontologica Sinica 2(4): 355–369. (medium confidence: only PBDB gives this; its author and year match the naming authority (Young 1954)).\n- Diet, inferred by PBDB for the group: herbivore (medium confidence: only PBDB gives this, and it infers it for the whole of Sauropoda, 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 Sauropoda; behaviour is rarely known for one genus).\n- Common names: マメンチサウルス, 馬門溪龍 (medium confidence: only Wikidata gives this; nothing contradicts it).\n\nNot known or disputed:\n- Order: no source Omnisaura uses gives this.\n- Named after: no source Omnisaura uses gives this.\n- 7 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)."
}