3 OLDEST KNOWN ANIMALS ON PLANET EARTH

Do you know the which is the first animal to be evolve. If you know or doesn’t know but you can learn it here.

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SPONGE (Porifera)

Sponge (porifera), the members of the phylum Porifera. They are multicellular organisms that have bodies full of pores and channels allowing water to circulate through them, consisting of jelly-like mesohyl sandwiched between two thin layers of cells.

It is believed that the first animal developed about 800 million years ago. But a new study revealed that the Comb jellies (Ctenophora) are the first animal but scientist can’t believe because it was so complex.

COMB JELLIES (Ctenophora) [ Un detailed ]

Since 2008, scientists have debated which of the two came first: the sponge (Porifera) or the comb jelly (Ctenophora). A new thorough genetic analysis suggests the latter was Earth’s first animal out of which all other creatures evolved.

A recent study which attempted to resolve the early diversification of animal lineages used a massive 1,719-gene dataset with dense taxonomic sampling and found evidence supporting the idea that sponges represent the sister group to all other animals.

By determining which genes weighed more for a particular hypothesis, like ‘comb jelly came first’, and by labeling the resulting differences as a ‘phylogenetic signal’, the team determined that the comb jelly has significantly more genes which support its ‘first to diverge’ status than the sponge.

A comprehensive genetic analysis gave credence to sponges as the ‘first to diverge’ in favor of the jellyfish. It’s likely that the two will switch roles multiple times before biologists reach a satisfying method. So we can’t determine it untill now future studies may answer it. Even though it was believed that comb jellies are evolved 505 or 730 million years ago

NAUTILUS

Half a billion years. That’s how long the nautilus has called our planet home, surviving all the major mass extinctions that hit the reset button on life throughout the globe. But now the nautilus is in danger of becoming extinct.