Order Tetraodontiformes
description
Transcript of Order Tetraodontiformes
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Order Tetraodontiformes
Modern Fishes
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Tetraodontiformes
• The most derived of all bony fisheso The most notable modification is the
reduction of the internal skeleton
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The Tetraodontiform Body
• Tetraodontiform fishes vary distinctly in their body form:
Gill openings are usually small Pelvic fins are absent Body plan ranges from globular, triangular
to extremely compressed
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The Tetraodontiform Body
Gray Triggerfish
Ocean Sunfish
Scrawled Cowfish
Striped Burrfish
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Tetraodontiform Protection• Since they are
vulnerable to predators most posses some form of protection:
Burrfish
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Tetraodontiform Taxonomy• Balistidae
o Leatherjackets Filefish & Triggerfish
• Ostraciidae o Boxfishes
• Tetraodontidaeo Puffers
• Diodontidaeo Porcupinefish
• Molidaeo Molas
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Family Balistidae• Triggerfish & Filefish• Common species:
o Planehead Filefish (Stephanolepis hispidus)
o Gray Triggerfish (Balistes capriscus)
o Humuhumu nukunuku apua’a Hawaiian Triggerfish
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Balistidae Habits• Usually slow moving,
brightly colored reef dwellers
• Both have robust dorsal spines and a pelvic apparatus which is slightly distensible Filefish feeding on a
Moon Jelly
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Triggerfish• Has 3 dorsal
spines, compared to 2 of the filefish
Trigger Mechanism
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Triggerfish
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Filefish
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Family Ostraciidae• Boxfishes• Common species:
o Scrawled Cowfish (Lactophrys quadricornis)
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Ostraciidae Characteristics• Body is enclosed
in a bony carapace, and a spinous dorsal is absento Some spp. secrete
ostracitoxinScrawled Cowfish
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Family Tetraodontidae• Puffers• Common species:
o Northern Puffer (Sphoeroides maculatus)
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Tetraodontidae Characteristics
• Have strong beak-like jaws with four teeth
• Slow moving fishes, that rely on toxins and the ability to puff themselves up for protection
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Tetrodotoxin• Tetrodotoxin found
in the internal organs o Can be fatal to
humanso Eaten in Japan
(Fugu) and prepared by licensed cooks
• Symptomso Slight numbness of
the lips and tongueo Increased paralysis,
unable to move, respiratory distress, affected speech
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Family Diodontidae• Porcupinefish• Common species:
o Striped Burrfish (Chilomycterus schoepfi)
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Diodontidae Characteristics• Have two fused
teeth in the moutho Family with
inflatable bodyo Body covered in
well developed sharp spines (some erect when body inflated)
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Family Molidae• Molas / Sunfish• Common species:
o Ocean Sunfish (Mola mola)
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Molidae Characteristics• Large, sluggish
pelagic predators that feed on jellyfish and other invertebrates
• Considered to be the most fecund vertebrates in the world, over 300 million eggs