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The horn shark is preyed upon by larger fishes and the northern elephant seal (Mirounga angustirostris), which consumes adults, juveniles, and egg cases. In addition, they are captured and eaten by bald eagles ( Haliaeetus leucocephalus ) at Catalina Island, and large marine snails are able to drill into their egg cases to extract the yolk . [ 6 ]
An egg case or egg capsule, often colloquially called a mermaid's purse, is the casing that surrounds the eggs of oviparous chondrichthyans. Living chondricthyans that produce egg cases include some sharks, skates and chimaeras. Egg cases typically contain one embryo, except for big skate and mottled skate egg cases, which contain up to 7 ...
Copper shark: Basking shark: Cetorhinus maximus: Cetorhinidae: Endangered [16] Basking shark: Frilled shark: Chlamydoselachus anguineus: Chlamydoselachidae: Least concern [17] Frilled shark in Aquarium Tropical at Palais de la Porte Dorée: Horn shark: Heterodontus francisci: Heterodontidae: Data Deficient [18] Horn shark at Monterey Bay ...
In most oviparous shark species, an egg case with the consistency of leather protects the developing embryo(s). These cases may be corkscrewed into crevices for protection. The egg case is commonly called a mermaid's purse. Oviparous sharks include the horn shark, catshark, Port Jackson shark, and swellshark. [80] [82]
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Within the chondrichthyans, horn sharks (Heterodontidae), some rays (Myliobatidae) and chimeras (Holocephali) exhibit durophagous behaviour. They have adaptations to allow for this including stout flattened teeth, hypertrophied jaw adductor muscles and robust jaws to feed on hard prey such as crustaceans and molluscs.
The surrounding egg white floats perfectly around the yolk, membrane intact. One of the divers was even able to make the egg 'dance' around by manipulating the current of the water around it.
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