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Some egg cases have a fibrous material covering the outside of the egg case, thought to aid in attachment to substrate. [1] [6] Egg cases without a fibrous outer layer can be striated, bumpy, or smooth and glossy. [1] [6] With the exception of bullhead shark eggs, egg cases are typically rectangular in shape with projections, called horns, at ...
The shark extracts its prey from the substrate using suction and, if necessary, levering motions with its body. Reproduction is oviparous, with females laying up to 24 eggs from February to April. After laying, the female picks up the auger-shaped egg cases and wedges them into crevices to protect them from predators.
Egg case with yolk. The swell shark is oviparous, laying two green or amber flattened eggs at a time. [1] [3] Fertilization occurs internally. [5] The egg cases become attached to kelp or the reef with tendrils. It has been suggested that the length of the tendrils depends on the amount of surf action the region is under. [4]
Some species are oviparous, laying their fertilized eggs in the water. 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.
The thin-walled egg cases are brown with distinctive pale transverse bands; and have a slightly furry texture and long adhesive tendrils at the corners. They are smaller than those of other shyshark species, measuring 3.5–5 cm (1.4–2.0 in) long and 1.5–3 cm (0.59–1.18 in) across.
The ridged-egg catshark (Apristurus ovicorrugatus) [1] is a species of shark belonging to the family Pentanchidae, the deepwater catsharks. This shark is found in the deep waters off northwestern Australia. [2] [3] The species name refers to the ridges on the egg case.
The shark hatched from an egg on Jan. 3, 2025. Aquarium staff are unsure how the egg came to be, as female and male sharks at the aquarium have not been in the same habitat for more than three years.
[4] [9] In captivity, the whelks Burnupena papyracea and B. lagenaria have been documented piercing the egg cases of this species and extracting the yolk. [11] A known parasite of the dark shyshark is the trypanosome Trypanosoma haploblephari, which infests the blood. [12] The egg case of the dark shyshark is purse-shaped and uniformly brown