Class Chondrichthyes - Cartilaginous Fishes

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Last updated 7:03 PM on 4/25/26
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10 Terms

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General Characteristics

Sharks, skates, rays; cartilaginous skeleton; 5-7 gill slits; lack operculum; placoid scales

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Heterocercal Tail

Asymmetrical tail where upper lobe is larger; sharks have this

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Placoid Scales

Tooth like scales made of dentin and enamel; replaceable (teeth are derivatives of these)

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Ampullary Organs of Lorenzini

Electroreceptors that detect weak electrical fields from prey

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Lateral Line System (Neuromasts)

Detect vibrations and water currents; present in all fishes

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Swimming

Liver with squalene provides buoyancy (no swim bladder) so they must keep swimming

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Salt Water

Blood iso-osmotic to seawater (contains urea and trimethlyamine oxide); internal fertilization via clasper

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Oviparous

Lays eggs

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Ovoviviparous

Live young develop in ovarian cavity

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Viviparous

Live young with placenta