HOME | DD

Description
Livebearers are group of fish what would have quite big evolutional success in the future. Today all livebearers are small or very small fishes, in future some species will grow to much bigger size.

Above there is a pair of Coregonopoecilia, eupoecilid (descendant of Gambusia, what was transported to Europe by humans long ago to fight with plague of mosquitoes). Coregonopoecilia is 50 centimeters long fresh water plankton feeder livebearer.

Below there is pair of ravenbeaks, 3-4 meters long, fast and agile marine predator.

Ravenbeaks are Selachipoecilids, no Eupoecilids and are descendants not of Gambusia but Heterandria. Selachipoecilids developed some interesting features, what make them little similar in their biology to sharks. It accommodations evolved firstly because were needed for very small species fish, but become helpful also for big. At first their bones are very weakly calcified. Except from skull, their skeleton is almost entirely made of gristle. Like some sharks, mammals and their ancestor from human age, Heterandria, they developed placenta, what grows from pericardium of their embryos. Selachipoecilids breed constantly. In females bodies there are always a lot of fetus in different development stage. These what ere ready to born are constantly dropped, while younger ones still grow.
They also developed something similar to pharyngeal jaws of cichlids and cyprinids, what allows them to chew food, but their pharyngeal jaws are not in throat, but are formed by hardened tongue with tooth on it and tooth on palate.
Selachipoecilids are mostly marine fishes, but some species live also in freshwater.

Description
Livebearers are group of fish what would have quite big evolutional success in the future. Today all livebearers are small or very small fishes, in future some species will grow to much bigger size.

Above there is a pair of Coregonopoecilia, eupoecilid (descendant of Gambusia, what was transported to Europe by humans long ago to fight with plague of mosquitoes). Coregonopoecilia is 50 centimeters long fresh water plankton feeder livebearer.

Below there is pair of ravenbeaks, 3-4 meters long, fast and agile marine predator.

Ravenbeaks are Selachipoecilids, no Eupoecilids and are descendants not of Gambusia but Heterandria. Selachipoecilids developed some interesting features, what make them little similar in their biology to sharks. It accommodations evolved firstly because were needed for very small species fish, but become helpful also for big. At first their bones are very weakly calcified. Except from skull, their skeleton is almost entirely made of gristle. Like some sharks, mammals and their ancestor from human age, Heterandria, they developed placenta, what grows from pericardium of their embryos. Selachipoecilids breed constantly. In females bodies there are always a lot of fetus in different development stage. These what ere ready to born are constantly dropped, while younger ones still grow.
They also developed something similar to pharyngeal jaws of cichlids and cyprinids, what allows them to chew food, but their pharyngeal jaws are not in throat, but are formed by hardened tongue with tooth on it and tooth on palate.
Selachipoecilids are mostly marine fishes, but some species live also in freshwater.