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Klas Aghnatha Ordo a. Mixiniformes Myxinoidea b.Petromyzontiformes
sub klas Cyclostomata Ordo a. Mixiniformes Myxinoidea b.Petromyzontiformes Petromyzontidae
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Types of Agnathans Hagfish- Ocean scavengers, not much is known about them. Lamprey- fresh and salt water, they are parasitic and prey on other fish. * Both have cartilagenous skeletons and sucker-like mouths.
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Ciri-ciri :1. Tanpa rahang. 2. V &P tidak berjari-jari. 3
Ciri-ciri :1.Tanpa rahang V &P tidak berjari-jari Notochord agak padat 4. Gill arch tidak ada -Insang melekat pada tulang insang luar, dalam bentuk keranjang disebut“branchial basket” bertaut pada neurocranium (tulang tengkorak). Jumlah insang 6 – 14 pasang. -Tubuh anguilliform, licin dan tanpa sisik. -Mulut melingkar berbentuk penghisap. Contoh Lamprey & Hagfish
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Hagfish
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Ordo Mixiniformes/Hyperotreta/ Myxinoidia
Mulut terminal dengan 4 pasang tentakel di pinggir Nostril di ujung kepala & berhubungan dengan pharynx Mata dibawah lapisan kulit Branchial basket pasang Tanpa D Famili : Mixynidae Genus : Myxine Species: Myxine glutinosa
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The Mouths of Hagfish & Lamprey
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Myxiniformes “Agnatha”
45 living species sister group to all other craniates lack jaws, paired appendages, bone, and vertebrae slime-producing glands-slime hags single median nostril one semicircular duct isosmotic serially hermaphroditic
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The body shapes
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Ordo Petromyzontiformes
Lamprey Ordo Petromyzontiformes Mulut bergigi, sub terminal & seperti corong Lubang hidung agak ke dorsal tidak berhubungan dengan pharynk Insang 7 pasang berada dalam branchial basket Kebanyakan anadromous Ginjal berbentuk mesonephros Mata normal D1 &D2
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Petromyzontiformes
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Terdapat di Australia Selatan, New Zealand & Amerika Selatan
Famili : Petromyzontidae Species Petromyzon marinus (Sea lamprey) Lampetra aryresii (River lamprey)
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Parasitic Lamprey
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