Most fruit bats are larger than insectivorous bats or Microchiroptera, however there are a number of small fruit bats also. The smallest species is 6cm (2.4 inches) long and thus smaller than some microbats. Most fruit bats have large eyes, allowing them to orient themselves visually in twilight and inside caves and forests. Wikipedia
Fruit bats live in the tropical areas of the world, such as the Middle East, Asia, Australia and Africa. They prefer locations with warm climates because they do not hibernate in cold weather. www.batworlds.com/fruit-bat/
Bats have been traditionally thought to belong one of two monophyletic groups, a view that is reflected in their classification into two suborders (Megachiroptera and Microchiroptera). According to the hypothesis, all living megabats and microbats are descendants of a common ancestor species that was already capable of flight. Wikipedia
The fruit bat's real name is the 'Mega Bat'
It is difficult to classify when the fruit bat (just the normal bat) regards to when the first appeared in geological times.
Morphological & Molecular Evidence
Closest relatives: Rhinopomaditae (Mouse-tailed bat), Emballonuridate (Sheath-tailed bat), Craseonycteridae (Hog-nosed bat), Nycteridae (Slit-faced bat), Megadermatidae (Yellow-winged bat), Rhinolophidae Horseshoe bat, Hipposideridae (Old World Leaf-nosed bat), Noctilionidae (Bulldog bat), Mormoopidae (Naked-backed, mustached, Ghost-faced bat), Phyllostomidae (New World Leaf-nosed bat), Natalidae (Funnel-eared bat), Furipteridae (Smoky-bat), Thyropteridae (Disc-winged bat), Myzopodidae (Sucker-footed bat), Vespertilionidae (Vesper bat), Mystacinidae (New Zealand Short-tailed bat), Molossidae (Free-tailed bat)
Some bat species show similar features but some don't
Birds and some insects (insects that have flight) have the same basic structure like a bat but are used differently. Bird wings soar through the sky and flap little times, insect wings are attached on the back so their six legs can move on the surface, the wings flap so fast you can hardly see them.
The bat is different from it's ancestors in way because Ptilocerous never had wings. The skull lengthened and the front paws grew larger to evolve into the bat we see now.
A transitional fossil is any fossilized remains of any life form that exhibits traits common to both an ancestral group its derived descendant group. They show evidence of evolution because the fossil could look similar to an actual life form that is still alive, for example, the Elephant shows evidence of how it evolved from the extinct Mammoth.
Comparative embryology is the branch of embryology that compares and contrasts embryos of different species.