"heterostracan" meaning in English

{
  "etymology_templates": [
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      "args": {
        "1": "Heterostraci",
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      "expansion": "Heterostraci",
      "name": "taxfmt"
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    {
      "args": {
        "1": "en",
        "2": "",
        "3": "an"
      },
      "expansion": "+ -an",
      "name": "suffix"
    }
  ],
  "etymology_text": "Heterostraci + -an",
  "forms": [
    {
      "form": "heterostracans",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "heterostracan (plural heterostracans)",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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        },
        {
          "kind": "lifeform",
          "langcode": "en",
          "name": "Vertebrates",
          "orig": "en:Vertebrates",
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        }
      ],
      "glosses": [
        "Any of the subclass Heterostraci of extinct jawless vertebrates that lived primarily in marine and estuary environments."
      ],
      "id": "en-heterostracan-en-noun-HGUIZZPN",
      "links": [
        [
          "Heterostraci",
          "Heterostraci#Translingual"
        ],
        [
          "extinct",
          "extinct"
        ],
        [
          "jawless",
          "jawless"
        ],
        [
          "vertebrate",
          "vertebrate"
        ],
        [
          "marine",
          "marine"
        ],
        [
          "estuary",
          "estuary"
        ],
        [
          "environment",
          "environment"
        ]
      ],
      "wikipedia": [
        "heterostracan"
      ]
    }
  ],
  "word": "heterostracan"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "Heterostraci",
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      },
      "expansion": "Heterostraci",
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    },
    {
      "args": {
        "1": "en",
        "2": "",
        "3": "an"
      },
      "expansion": "+ -an",
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    }
  ],
  "etymology_text": "Heterostraci + -an",
  "forms": [
    {
      "form": "heterostracans",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
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      "expansion": "heterostracan (plural heterostracans)",
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        "Any of the subclass Heterostraci of extinct jawless vertebrates that lived primarily in marine and estuary environments."
      ],
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        [
          "Heterostraci",
          "Heterostraci#Translingual"
        ],
        [
          "extinct",
          "extinct"
        ],
        [
          "jawless",
          "jawless"
        ],
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          "vertebrate",
          "vertebrate"
        ],
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          "marine",
          "marine"
        ],
        [
          "estuary",
          "estuary"
        ],
        [
          "environment",
          "environment"
        ]
      ],
      "wikipedia": [
        "heterostracan"
      ]
    }
  ],
  "word": "heterostracan"
}