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今次同大家淺談既就係大家一直期待既於魚漁餘如
![](https://cdn.lihkg.com/assets/faces/normal/hoho.gif)
![](https://cdn.lihkg.com/assets/faces/normal/clown.gif)
![](https://cdn.lihkg.com/assets/faces/normal/angry.gif)
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係進入大家食開/成日釣到既魚之前,我地先睇下佢地既祖先同埋啲老屎忽先,然後再慢慢帶大家入去於魚漁餘如既世界
脊椎動物的阿公
呢啲生物全部都係海生生物,而且係Chordata呢個phylum已經分左出黎,可見佢地係極極極之primative。佢地全部都有一個結構名為Notochord,呢條野就係脊椎既前身。呢個物種老到連頭骨都未有,以filter feeding方式,吸海水經過Pharyngeal slits同intestine,直接由anus
![](https://cdn.lihkg.com/assets/faces/normal/flowerface.gif)
Lancelets/Amphioxus
![](https://upload.wikimedia.org/wikipedia/commons/4/47/Branchiostoma_lanceolatum.jpg)
![](http://shapeoflife.org/sites/default/files/global/images/graphic-amphioxus.jpg)
Tunicates
![](https://upload.wikimedia.org/wikipedia/commons/thumb/c/cd/Tunicate_komodo.jpg/1200px-Tunicate_komodo.jpg)
頭骨的出現
各種壓力令到某物種覺得,係時候要進化喇,因而出現左新既結構:頭骨,並derived左Craniata呢個clade,例子有hagfish。係呢段時間,vertebral column都開始係生態上出現,例如Lamprey。兩種都未絕種。
Hagfish好似鰻魚咁,有眼,不過弱視。Scavenger,被捕時會噴黏液,而且打自己結(見下圖)方便走佬
![](http://theswatchbook.offsetwarehouse.com/wp-content/uploads/sites/5/2017/06/3-s2.0-B9780123745538000356-f00035-03-9780123745538.jpg)
![](https://68.media.tumblr.com/4dd0382755c28b49a8ff6ddab88b9ef2/tumblr_inline_ommhny11uk1s4r3s0_500.gif)
![](https://lh5.googleusercontent.com/-Tn-BhgylvYU/U0ceCLcprhI/AAAAAAAAA1M/s6Ca1i_HI0wJm6t-N0NMF9LDLFgV3h3YgCL0B/w636-h352-no/Hagfish%2Bslime.gif)
Lamprey有牙,Lifestyle似水蛭
![](http://ichef.bbci.co.uk/naturelibrary/images/ic/credit/640x395/e/eu/european_brook_lamprey/european_brook_lamprey_1.jpg)
http://ichef.bbci.co.uk/wwfeatures/wm/live/1280_640/images/live/p0/36/k5/p036k5sn.jpg小心
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Extra: 裝甲Jawless Fish: Pteraspidomorphi
![](https://upload.wikimedia.org/wikipedia/commons/7/75/Larnovaspis_stensioei.jpg)
相信呢張圖大家唔太陌生,佢地有強大頭外殻保護,不過個嘴仲未有jaw,只能吸野
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顎的出現
去到一個點,大家都覺得一味得個吸字其實好快收得皮,所以某聰明物種諗到整個顎骨出黎,咪可以咬野囉
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第一pair鰓骨成為上下顎,第二pair鰓骨移前,支持顎骨。咁個鰓個洞呢?就成為左鯊魚既Spiracle,
![](https://cdn.lihkg.com/assets/faces/normal/shocking.gif)
![](https://cdn.lihkg.com/assets/faces/normal/shocking.gif)
![](https://cdn.lihkg.com/assets/faces/normal/shocking.gif)
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![](http://blog.everythingdinosaur.co.uk/wp-content/uploads/2014/04/evolution_of_jaws.jpg)
顎骨令到佢地可以咬住食物,唔需要再靠吸/水流,同時令到佢地呼吸能力大大提升,係一個當時好有優勢既upgrade
裝甲魚Placodermi(已絕種)
古時既魚大多數都有強勁頭外殼同胸外殼,而且呢個時候開始出現Pelvic Fin(腹鰭),可謂稱霸左大部分Aquatic system。而至於點解佢地會絕種,暫時最接納既講法就係因為一個Late Devonian既extinction event (海水位下降?+Algae bloom?)
頭骨化石
![](http://www.ucmp.berkeley.edu/vertebrates/basalfish/dunkleosteus.jpg)
![](http://www.fossilmuseum.net/Fossil_Galleries/Fish_Devonian/Dunkleosteous/Dunkleosteous1.jpg)
還原示意圖
![](http://www.ilgiornaledeimarinai.it/wp-content/uploads/2013/06/pesci-placodermi.jpg)
![](http://2.bp.blogspot.com/-CqCrsmXdGSA/VWOk0ITBxnI/AAAAAAAAFI4/diHSf3Jm2Yg/s1600/Bothriolepis_NT.jpg)