Hello, I have read that the Mantas put 20 eggs but inside this 20 eggs (mermaid pocket) they have 400 more eggs, i don't understand that. Also, i have read that this eggs normally are attach to algas to feed when they are born, but then again i have seen videos of the mantas being born of the inside of the mom. it is because they are different species? please i would love to know that. thank you so much.
When you say mantas, you are talking about manta ray aka devils ray, which are pelagic and travelers batoids, very famous, and seen in snorkel and diving spot in tropical parts of the world. These species do not lay eggs, but rather become pregnant and give birth.
Distant relatives to manta rays are skate (ajidae) and in some cases they lay eggs.
There are big species, who lay big egg cases. such is the big skate (Beringraja binoculata), and particulary, this one is know to lay around (in some cases) 5 to 10 eggs or embryos, inside one single egg case or mermaid pocket.These eggs are fertiliced insided the female, after the copula. Then, the eggs are closed insided the egg case and laying on the seafloor.
but in other cases, small skate species, usually coastal, lay a lot of egg cases with a single egg inside, each egg case have tendrils who entangles, and these female lay a lot of egg (or it is likely a group of female laying egg in groups) here is one example of numerous egg cases lay together.
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