Fish Clade Agnatha.

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Agnatha Hagfish & Lamprey
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Presentation transcript:

Fish Clade Agnatha

Ancestors of Jawless Fishes Ostracoderms Had bony scales as body armor Paleozoic Era https://www.youtube.com/watch?v=Djt hfvB47Mc

Cyclostomata Hagfish & Lampreys Lack a jaw Lack internal ossification Lack paired fins Lack scales Cyclostomata Hagfish & Lampreys

Hagfish All marine Approximately 70 species Mouth with rasping tongue & 4 rows of keratinized teeth No stomach, strictly scavengers Almost blind, keen sense of smell

https://www.youtube.com/watch?v=fB_frD53qjg https://www.youtube.com/watch?v=bqk0mnMgwUQ

Lampreys Freshwater & Marine, free-living & parasitic Approximately 38 species 7 pair gills, each with external opening sucker-like oral disk & rasping tongue single nostril

https://www.youtube.com/watch?v=9JQ6oHjpeqU https://www.youtube.com/watch?v=-SYhOD1Yx10 https://www.youtube.com/watch?v=X1tQGeEzAjI (dissection)

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