lampreys and hagfishes
DESCRIPTION
Lampreys and Hagfishes. Hagfishes. Subphylum Vertebrata Class Pteraspidomorphi Family: Myxinidae (Hagfishes, slime eels, or slime hags) Common Species Atlantic Hagfish ( Myxine glutinosa ). Hagfish Feeding Habits. Remarkable due to their lack of external features - PowerPoint PPT PresentationTRANSCRIPT
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Hagfish & Lampreys1
Lampreys and Hagfishes
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Hagfishes
Subphylum Vertebrata• Class Pteraspidomorphi
o Family: Myxinidae (Hagfishes, slime eels, or slime hags)
• Common Species– Atlantic Hagfish (Myxine
glutinosa)
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Hagfish Feeding Habits
Remarkable due to their lack of external features
Feed on benthic invertebrates and scavenge on dead and dying fish
Ventral mouth has tongue and 4 rows of keratin teeth
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One Word: Mucus
Have large numerous mucus pores Have 70 – 200 pairs of slime glands Mucus function is not completely
understood The hagfish ties itself in an overhand
knot to rid itself of the slime Leather made of “eel skin” are
sometimes made from hagfish
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That Looks Painful!
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Structure
3 pairs of barbels around the nostril and mouth used as tactile organs
Sides of body have 1–14 gill openings Rudimentary eyes on the top of the head
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Hagfish Reproduction
Both ovaries and testes are present but only one is functional
Female lays large sausage shaped (2-3cm.) eggs, numbering 20-30
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Lampreys
Subphylum Vertebrata• Class:
Cephalspidomorphio Family:
Petromyzontidaeo Common Species
• Sea Lamprey (Petromyzon marinus)
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Sea Lamprey Habits
Latches on sides of fish sucking blood and body juices (lymph)
Some species are more predatory than others removing bone and organs
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Sea Lamprey Structure
2 separate dorsal fins with a maximum size of 47”
Distinct oral disc with tooth like plates of keratin on eversible tongue
Seven pairs of gill openings on each side of the head, lacks paired fins
Unlike hagfish, have well-developed eyes
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Sea Lamprey Structure
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Lamprey Reproduction
Anadromous Also, have both
reproductive organs but only one is functional
Male creates nest with stones, and female spawns up to 124,000-260,000 eggs
River Lamprey
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Ammocoete
Larval lamprey = ammocoete, lives secretive life
buried where it filter feeds on algae and detritus
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Sea Lamprey Lifecycle
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