The duration of pregnancy may vary quite a little from species to species. Its unusual look is only partially conveyed by the species name, which comes from the Latin word meaning snakelike and is derived from anguineus. Frilled sharks are also known as living fossils due to the fact that they have altered very little over the course of millions of years.
At depths of about 1000 meters, there is very little competition from other sharks, which is one of the primary reasons why their look has not changed over time. This is also one of the primary reasons why their appearance is so consistent. It's possible that the extreme cold of its deep-sea environment is what's causing its metabolic processes to creep along at a snail's pace. There's a possibility that other creatures that live underground have pregnancy times that are just as drawn out.
The African elephant's pregnancy lasts for a record-setting 22 months, making it the longest among all terrestrial animals. However, this is dwarfed in comparison to the gestation duration of the eel-like frilled shark, also known as Chlamydoselachus anguineus, which can be found off the coastlines of South Africa and Chile. Japanese researchers have revealed that this species' gestation period may last for up to 42 months.
They do not share a connection with their offspring via the placenta, in contrast to the majority of other animals. Instead, they reproduce through a process known as internal fertilization, and the embryos that are formed do so by obtaining their nourishment from the yolk sacs. These sharks have the ability to give birth to live young, but they do so only once the offspring have developed the skills necessary to survive on their own. As a consequence of this, it is estimated that their gestation cycle lasts around 42 months, making it the longest of any mammal.
Frilled Sharks have a long and healthy lifespan. Around the age of 25 is the average age at which they die away. However, since researchers have a difficult time following Frilled Sharks over extended periods of time, this is simply a guess based on specimens that have been collected.
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