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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 ...
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]
This shark is found in the deep waters off northwestern Australia. [ 2 ] [ 3 ] The species name refers to the ridges on the egg case . Egg cases belonging to this species had been documented as early as the 1980s, but could not be matched to any species of Australian shark until scientists examined a shark specimen of previously uncertain ...
The zebra shark is oviparous, with females laying large egg capsules measuring 17 cm (6.7 in) long, 8 cm (3.1 in) wide, and 5 cm (2.0 in) thick. The egg case is dark brown to purple in color, and has hair-like fibers along the sides that secure it to the substrate. [3]
The female Japanese bullhead shark has been known to deposit their eggs in one location along with other females, called a "nest". [8] The egg case of the Mexican hornshark features a tendril and more rigid flanges, suggesting that egg case design of this species primarily involves anchoring with tendrils rather than wedging into crevices. [8]
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The egg case of the crested bullhead shark has distinctive, long tendrils at one end. Crested bullhead sharks are oviparous with a possibly annual reproductive cycle. Females produce 10–16 eggs per year during late winter in July and August, though Michael (1993) noted that egg-laying may continue year-round. [1]
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