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The egg case is very smooth and lacks external fibrous material. [1] This egg case can be easily identified from all others in that it is the only one to have a steep ridge; giving the case a convex shape. [1] The keel on the egg case is considered very broad; representing 30–33% of the width of the egg case. [1]
The Shark Trust holds outreach and engagement events for the public. One of the biggest projects is The Great Eggcase Hunt. This project empowers the public to find shark, skate and ray eggcases on their beach and log them. The data is used to monitor species distribution. [5]
Each egg is a leathery black eggcase with horny corners, known by the common name "mermaid's purse" (as are the eggcases of other rays, skates and sharks). They usually are 72– 90 mm long and 42– 52 mm wide.
A benthic predator, it feeds on a range of bony fishes, smaller sharks, crustaceans, and cephalopods. Like other catsharks, the nursehound is oviparous in reproduction. Females deposit large, thick-walled egg cases, two at a time, from March to October, securing them to bunches of seaweed. The eggs take 7–12 months to hatch.
Sharkbook is a global database for identifying and tracking sharks, particularly whale sharks, using uploaded photos and videos.In addition to identifying and tracking sharks, the site allows people to "adopt a shark" and get updates on specific animals.
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]
Egg case may refer to: Ootheca , an egg case made by some insects and molluscs Egg case (Chondrichthyes) , an egg case made by some sharks, skates, and chimaeras
The tough egg case is flask-shaped and reddish, with a rounded bottom and a pair of "horns" at the top, and measuring around 3.1–3.8 cm (1.2–1.5 in) long and 1.1–1.3 cm (0.43–0.51 in) across. The egg case of G. melastomus is similar in appearance but significantly larger. [1] [5] Once deposited, the egg hatches within a short period of time