Do the bat ancestors in Indonesia come from Europe?

* Ancestors of modern bats likely originated from Europe at the end of the Paleocene with a statistical support level of 99.2%.
* Descendants spread to Africa, then to America, Asia, and Australia in the early Eocene.
* The lineage spread from Europe to Africa, making the Europe-Africa region the main migration center.
* Colonization continued across land bridges and archipelagos of Southeast Asia to Oceania and Australia.
* Prehistoric fossils called Vielasia are in the oldest group of bats (Eochiroptera), suggesting the larynx echolocation system evolved before modern diversification.
* Chromosomal data placed the podiciped family of bats from Madagascar as the earliest branch within the superfamily Vespertilionoidea.
* The ancestor likely possessed 26 chromosomes, with genome evolution dominated by chromosomal fusion events.
* The Yinpterochiroptera group underwent adaptive radiation and spread eastward towards Asia in the middle Eocene starting from Africa about 57.1 million years ago.
* Fruit bats (Pteropodidae) and horse-shoe bats (Rhinolophidae) are descendants of the ancient Yinpterochiroptera expansion route through Southeast Asia to Wallacea.
* Indonesia has 239 bat species, including 158 insectivores and 81 frugivores.
* Sulawesi is a global center of endemism.
* In Sulawesi, approximately 72 bat species are recorded, with 18 being endemic.

The narrative presented connects deep evolutionary history, genomic data, and localized biodiversity to frame the story of bat dispersal across the globe. The shift in origin from earlier African/North American hypotheses to a European origin based on Bat1K research demonstrates how new methodologies can restructure established scientific maps, highlighting that patterns are contingent upon the analytical tools applied. Furthermore, the subsequent understanding of spread—from Europe to Africa as a nexus, followed by radiation across continents during the Paleocene-Eocene Thermal Maximum—reveals climate and geography as potent drivers for evolutionary change, rather than purely migratory instinct. The focus on Sulawesi emphasizes a crucial intersection where macro-evolutionary history meets micro-endemism; this region serves not only as a center of bat diversity but also as a consequence of ancient biological corridors. The ecological roles of bats in Sulawesi—pollination, seed dispersal, and pest control—are directly tied to the preservation of their habitat, suggesting that current conservation threats are inextricably linked to past evolutionary pathways. The analysis suggests that understanding biodiversity hotspots requires integrating deep time genetics with contemporary ecological pressures on specific landforms.
Bridge Questions: How might incorporating the findings about ancient inter-lineage mating (introgression) change our assumptions about the current taxonomic relationships within Chiroptera? What specific parallels exist between the historical expansion routes of bat groups and broader patterns of macrofaunal dispersal under fluctuating climatic regimes? What are the long-term conservation implications if we treat local endemic centers like Sulawesi as primary markers for global evolutionary history?