What is phylogenetic relic?

phylogenetic relic is a body organ that has lost its real use and still exists only because there is no particularly strong selection pressure against its existence. Common examples in humans is an addition. The amendment is considered to be a phylogenetic relic of the body present in many herbivores called CECUM, which contains special bacteria for digestion of cellulose, hard material in plants. The human amendment lacks these bacteria, so people cannot spend cellulose.

The gland was once considered a phylogenetic relic, until the sixties, when it was found to produce melatonin, a hormone that modulates circadian rhythms. The uniqueness and secrets of the Pineal glands caused René Descartes to call it the "seat of the soul", a body organ that linked people to God, even though we have not seen this theory recently in biological magazines. Belongs to nCycads, Horseshoe Crab and the famous colacant, originally thought they had been extinct for tens of millions of years, which were caught in 1938 from the coast of Africa. These species have changed over hundreds of millions of years. Phylogenetic relics are sometimes also referred to as living fossils.

vampire octopus or vampyroteuthis infernalis , which means "vampire octopus from hell" is a small velvety black organism that dwells deep in the ocean. It is neither octopus nor octopus, but phylogenetic relics largely extinct phylum. Tuatar, the type of reptile, has a highly developed pineal gland, with a medium pineal, paraffys and a pineal bag, in great contrast with our homogeneous pinealmaze, indicating that the wider gland is indeed partly part, despite its small hormonal role in humans. Evidence such as this allows us to assess whether it is a particular body organ or a type of phylogenetsican relics.

In one or the other point biologists have requested various sharks, rodents, crustaceans, plants and many others as phylogenetic relics. One crustacean, neoGlyfea neocaledonica , looks like a bizarre cross between shrimp and lobster. There are many other interesting fossils that you can find if you make an internet search for this term.