Wiktionary
share taxi
n. A vehicle for hire, typically smaller than a bus, taking passengers on a fixed or semi-fixed route without timetables, departing when all seats are filled.
Wikipedia
Share taxi
A share taxi (also called shared taxi) is a mode of transport which falls between both taxicabs and buses. These vehicles for hire are typically smaller than buses and usually take passengers on a fixed or semi-fixed route without timetables, but instead departing when all seats are filled. They may stop anywhere to pick up or drop off their passengers. Often found in developing countries, the vehicles used as share taxis range from four-seat cars to minibuses. They are often owner-operated.
The UITP term "informal transport" includes share taxis.