Drosophila melanogaster is a famous model system used to understand various aspects of life.This is largely due to various aspects of fruit fly like its fast development cycle, easy and cheap to culture in lab,wide array of genetic tool (various mutants available, markers,balancer chromosomes, salivary gland chromosomes or gaint chromosomes, UAS – GAL4 system,P element transformation for generating transgenic fly, UAS RNAI for gene Knock down) and fully sequenced genome of about 12 Drosophila species. (2170)

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A new study led by Max Telford completely shook the animal Tree of life and also mark the birth of a new phyla termed “Xenacoelomorpha”.
Xenoturbella and Acoelomorpha are marine worms with highly debated ancestry. Both were originally associated with the flatworms (Platyhelminthes), but molecular data have revised their phylogenetic positions, generally linking xenoturbella to the deuterostomes leaving Acoelomorpha or Acoels as the most basally branching bilaterian group. (524)

Gaining more information related to the dynamics of social links and interactions among different individuals living in a group is of high importance to understand evolution of animal sociality, including that of humans.Elephants, dolphins, as well as some carnivores and primates maintain social links despite their frequent splitting and merging in groups of variable composition, a phenomenon known as fission–fusion. (435)