Klas Aghnatha Ordo a. Mixiniformes Myxinoidea b.Petromyzontiformes

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Presentation transcript:

Klas Aghnatha Ordo a. Mixiniformes Myxinoidea b.Petromyzontiformes sub klas Cyclostomata Ordo a. Mixiniformes Myxinoidea b.Petromyzontiformes Petromyzontidae

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.

Ciri-ciri :1. Tanpa rahang. 2. V &P tidak berjari-jari. 3 Ciri-ciri :1.Tanpa rahang 2.V &P tidak berjari-jari 3.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

Hagfish

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 10-14 pasang Tanpa D Famili : Mixynidae Genus : Myxine Species: Myxine glutinosa

The Mouths of Hagfish & Lamprey

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

The body shapes

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

Petromyzontiformes

Terdapat di Australia Selatan, New Zealand & Amerika Selatan Famili : Petromyzontidae Species Petromyzon marinus (Sea lamprey) Lampetra aryresii (River lamprey)

Parasitic Lamprey