耳材村海口魚

出自維基百科,自由嘅百科全書
跳去: 定向搵嘢
Wikipedia:點樣睇生物分類框How to read a taxobox
海口魚
化石年代:寒武紀早期 - 奧陶紀早期
Haikouichthys4.png
瀕危指標
Extinct (fossil)
物種分類
動物界 Animalia
脊索動物門 Chordata
超綱Superclass: 無頜總綱 Agnatha
海口魚屬 Haikouichthys
Luo et al., 1999
耳材村海口魚
H. ercaicunensis

二元學名
Haikouichthys ercaicunensis
Luo et al., 1999

海口魚學名Haikouichthys)係一類原始嘅類似嘅生物,屬於無頜總綱。下便只有一個物種,就係耳材村海口魚(H. ercaicunensis)。

佢嘅化石雲南澄江動物群帽天山層)搵到,可以追溯到寒武紀,被認為係至今為止發掘到嘅最古老嘅魚類化石。[1]佢嘅發現對古生物學動物源流學說有非常大嘅影響,因為佢將科學家原先估計脊椎動物出現嘅時期向前推到5億年前。[2]

支序分類學研究顯示海口魚可能屬於原始嘅無頷總綱,最接近八目鰻。佢大概長2.5厘米[1],比喺同一個地方發現嘅昆明魚窄身啲。佢嘅完模標本中國雲南昆明筇竹寺組搵到。

海口魚有明顯嘅頭部同軀體。頭上至少有6個,可能有9個。身體分成幾節,有明顯嘅背鳍[1]佢可能有脊索,但係標本凈係保存咗一細橛。標本冇咗條尾嘅末端。背鰭指向頭部,而家啲魚亦有少數係噉樣嘅。海口魚亦有腹鰭。喺腹部有13個環狀結構,估計係生殖腺、排泄器官或者其他嘢。佢嘅骨骼並無生物礦化嘅跡象。

參考[編輯]

  1. 1.0 1.1 1.2 王易超 (2003年). 云南两大化石群揭开生命演化之谜 (OL). 金黔在線. 
  2. Monastersky, R. (November 6, 1999). "Waking Up to the Dawn of Vertebrates". Science News. 156 (19): 292. 

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    Quote quote

    Relevant text quoted from the source; displays last, enclosed in quotes; needs to include terminating punctuation

    預設
    範例
    自動值
    內容 可選
    Postscript postscript

    The closing punctuation for the citation; ignored if 'quote' is defined; to suppress use reserved keyword 'none'

    預設
    .
    範例
    自動值
    可選
    Ref ref

    An anchor identifier; can be made the target of wikilinks to full references; special value 'harv' generates an anchor suitable for the harv and sfn templates

    預設
    範例
    自動值
    可選
    Separator separator

    The punctuation used to separate lists of authors, editors, etc.; a space must be encoded as   to suppress use reserved keyword 'none'

    預設
    .
    範例
    自動值
    可選
    Content deliverer (i.e. Database) via

    Provider of the article (not the publisher), usually an aggregator of journal articles or a repository

    預設
    範例
    JSTOR, Project MUSE, Elsevier Science Direct
    自動值
    字串 建議
    Bibcode access level bibcode-access

    If the full text is available from ADS via this Bibcode, type 'free'.

    預設
    範例
    自動值
    字串 可選
    DOI access level doi-access

    If the full text is free to read via the DOI, type 'free'.

    預設
    範例
    自動值
    字串 可選
    HDL access level hdl-access

    If the full text is free to read via the HDL, type 'free'.

    預設
    範例
    自動值
    字串 可選
    Jstor access level jstor-access

    If the full text is free to read on Jstor, type 'free'.

    預設
    範例
    自動值
    字串 可選
    OpenLibrary access level ol-access

    If the full text is free to read on OpenLibrary, type 'free'.

    預設
    範例
    自動值
    字串 可選
    HDL access level osti-access

    If the full text is free to read on OSTI, type 'free'.

    預設
    範例
    自動值
    字串 可選

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