{
  "species_id": 2,
  "folder": "02_海鞘",
  "pages": [
    {
      "source": "讲解手册/珍奇柜-脊梁骨展签五审_0923.pdf",
      "page": 10,
      "role": "scientific_label",
      "files": [
        "02_海鞘/Exhibit_Materials/Handbook_03_p010.pdf",
        "02_海鞘/Exhibit_Materials/Handbook_03_p010.jpg",
        "02_海鞘/Exhibit_Materials/Handbook_03_p010.txt"
      ],
      "text": "海鞘纲未定种\n分类：脊索动物 被囊动物\n时代：现生\n产地：中国\n属性：浸制标本\nAscidiacea indet.\nClassification:Chordata Tunicata\nAge: Recent\nLocality: China\nStatus: Fluid-perserved specimen",
      "text_method": "OCR + source page image"
    },
    {
      "source": "讲解手册/珍奇柜-脊梁骨展签五审_0923.pdf",
      "page": 11,
      "role": "exhibit_context",
      "files": [
        "02_海鞘/Exhibit_Materials/Handbook_03_p011.pdf",
        "02_海鞘/Exhibit_Materials/Handbook_03_p011.jpg",
        "02_海鞘/Exhibit_Materials/Handbook_03_p011.txt"
      ],
      "text": "海鞘\n脊椎动物最近的无脊椎近亲\n海鞘成体通常呈囊状，多固着在岩石\n等基底上生活，外形与鱼类相差很大。\n然而，大多数海鞘的幼体呈蝌蚪状，能\n够短暂游泳，并具有脊索、背神经管和\n肛后尾等脊索动物基本特征。幼体找\n到适宜基底后附着并发生变态，尾部\n被吸收，脊索随之消失，最终发育为固\n着生活的成体。分子系统学研究表明，\n尾索动物是脊椎动物的现生姐妹群，\n与脊椎动物的亲缘关系比文昌鱼所属\n的头索动物更近。\nAscidian\nThe Closest Living Invertebrate Relatives of Vertebrates\nAdult sea squirts are typically sac-like marine animals \nthat live attached to rocks or other substrates. Although \ntheir adult form looks very different from that of a fish, \nmost sea squirts have tadpole-like, free-swimming larvae. \nThese larvae possess key chordate features, including a \nnotochord, a dorsal hollow nerve cord and a post-anal \ntail. After finding a suitable substrate, the larva attaches \nitself and undergoes metamorphosis. Its tail is resorbed, \nthe notochord disappears, and it develops into a sessile \nadult. Molecular phylogenetic studies indicate that \ntunicates are the living sister group of vertebrates. They \nare therefore more closely related to vertebrates than are \nlancelets, such as those of the genus Branchiostoma, and \nprovide important evidence for understanding vertebrate \norigins.",
      "text_method": "native"
    }
  ],
  "videos": [],
  "images": [],
  "labels": [
    {
      "source": "讲解手册/珍奇柜-脊梁骨展签五审_0923.pdf",
      "page": 10,
      "role": "scientific_label",
      "files": [
        "02_海鞘/Exhibit_Materials/Handbook_03_p010.pdf",
        "02_海鞘/Exhibit_Materials/Handbook_03_p010.jpg",
        "02_海鞘/Exhibit_Materials/Handbook_03_p010.txt"
      ],
      "text": "海鞘纲未定种\n分类：脊索动物 被囊动物\n时代：现生\n产地：中国\n属性：浸制标本\nAscidiacea indet.\nClassification:Chordata Tunicata\nAge: Recent\nLocality: China\nStatus: Fluid-perserved specimen",
      "text_method": "OCR + source page image"
    }
  ]
}