Please give me some examples of recently-discovered biological species or higher-order taxa that had a big impact on the scientific community.
1) Wollemi Pine: In 1994, the discovery of a new species of pine tree in Australia was announced, the Wollemi Pine (Wollemia nobilis), a living fossil and a relict species from the age of dinosaurs.  With less than 100 adult trees known to exist in the wild, the Wollemi Pine is now the focus of extensive research to safeguard its survival.

2) The Skywalker hoolock gibbon or Gaoligong hoolock gibbon is an arboreal primate in the gibbon family, Hylobatidae. It was was discovered in China, first described in January 2017 in the American Journal of Primatology. The discovery highlights the high levels of biodiversity in the region and the need for increased conservation efforts.

3) The Tapanuli orangutan (Pongo tapanuliensis) is a species of orangutan restricted to South Tapanuli in the island of Sumatra in Indonesia. It is one of three known species of orangutan, alongside the Sumatran orangutan (P. abelii), found farther northwest on the island, and the Bornean orangutan (P. pygmaeus). It was described as a distinct species in 2017. As of 2018, there are roughly 800 individuals of this species and it is currently on the critically endangered species list.
what makes the wollemi pine a living fossil