| Gaia: | Seven Deltochilina species (Anomiopus cirulito, Canthon triangularis, C. lituratus, C. edmondsi, C. morsei, C. angustatus and C. lucreciae) were used as biogeographic indicators, to exemplify the influence of South American fauna in Mexican tropical diversity, seeking to explain why Mexico, south of the Isthmus of Tehuantepec, is increasingly Neotropical. The time scale used is from the end of the Pleistocene to the present time and three levels of information were considered: 1) Penetration with minimal presence, 2) Penetration with marginal populations and 3) Penetration with established populations. Examples of foreign invaders that have successfully established in livestock areas, without displacing any native species, are provided in this study. The natural phenomena that have conditioned the current distribution of the selected indicators correspond to geological and macroclimatic processes, which influenced the composition and movements of horobiota at the continental level. The tendency of Deltochilini from Central and South America to invade Mexico has been very intense, using the Panamanian Bridge or even the inter-Caribbean bridge to disperse, advancing with the jungle and, their number exceeds the incipient species of recent penetration, of any other border of Mexico.
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