Asian and southern European funnel-web spiders, and this is a genus that deserves more caution than its obscurity implies.
M. gigas and related species carry venom that is medically significant, with documented serious envenomations. They are not the Australian funnel-webs, but the family relationship is real and the venom is not trivial. They build sheet webs with a funnel retreat and sit at the mouth.
Supply is irregular Asian material and modest European breeding. The concerning thing about this genus is that it is often listed alongside harmless funnel-web builders like Linothele with no distinction drawn, and a buyer scanning quickly could easily order the wrong one. Read the listing.