Periostracum
type: Thing
description: outermost layer of the shell in many shelled animals
additional property: PropertyValue
  property ID: P279
  value: seashell
additional property: PropertyValue
  property ID: P646
  value: /m/0f1m7q
additional property: PropertyValue
  property ID: P1417
  value: science/periostracum
additional property: PropertyValue
  property ID: P6366
  value: 165595923
confidence:
  popularity graph score:
    score: 0.012
    score pct: 1
    tier: long_tail
    components:
      sitelinks: 14
      sitelinks norm: 0.033
      unique citations: 0
      unique citations norm: 0.0
      monthly pageviews: 187
      monthly pageviews norm: 0.0
  sitelinks: 14
  unique citations: 0
  monthly pageviews: 187
  yearly pageviews: 372
  pageview trend:
    m: 2026-08
    v: 187
  pageview trend:
    m: 2026-07
    v: 37
  pageview trend:
    m: 2026-06
    v: 53
  pageview trend:
    m: 2026-05
    v: 5
  pageview trend:
    m: 2026-05
    v: 23
  pageview trend:
    m: 2026-05
    v: 4
  pageview trend:
    m: 2026-05
    v: 1
  pageview trend:
    m: 2026-05
    v: 5
  pageview trend:
    m: 2026-04
    v: 3
  pageview trend:
    m: 2026-04
    v: 3
  pageview trend:
    m: 2026-04
    v: 48
  pageview trend:
    m: 2026-04
    v: 1
  pageview trend:
    m: 2026-04
    v: 2
  popularity:
    sitelinks: 14
    max: 423
    pct: 3.3
  tier: long_tail
claims:
  P279:
    value: Q213096
    source count: 0
    confidence: 0.0
    value label: seashell
  P646:
    value: /m/0f1m7q
    source count: 0
    confidence: 0.0
  P1417:
    value: science/periostracum
    source count: 0
    confidence: 0.0
  P6366:
    value: 165595923
    source count: 0
    confidence: 0.0
meta:
  wikidata id: Q2071059
  domain: general
  level: standard
  html url: https://4ort.xyz/entity/periostracum
  markdown url: https://4ort.xyz/entity/periostracum.md
  facts url summary: https://4ort.xyz/entity/periostracum/facts.json
  facts url standard: https://4ort.xyz/entity/periostracum/facts.json
  facts url full: https://4ort.xyz/entity/periostracum/facts.json
  data source: Wikidata (CC0 / public domain)
  license: https://creativecommons.org/publicdomain/zero/1.0/
  api version: v1
  served at: 2026-08-24T01:23:42.303539Z
  entity updated at: 2026-04-10T23:15:39.978965+00:00Z
  entity created at: 2026-04-10T23:15:39.978965+00:00Z