Abstract
Transitroides morsei new genus, new species, is described from late Oligocene Early Miocene amber deposits of Chiapas Province from southern Mexico. This new taxon is the first known fossil member of the amphipod family Talitridae and superfamily Talitroidea. It appears intermediate between regional extant palustral (salt‐marsh) genera and fully terrestrial landhoppers of the genus Caribitroides. These beetle‐like crustaceans form a significant part of the forest‐floor leaf‐litter communities in some tropical parts of the globe. Extant terrestrial amphipods occur in south‐central Mexico and adjacent rain forest habitats in Central America and the Caribbean. Their occasional use of arboreal habitats in search for decaying organic matter, which serves as food, explains their occurrence in fossilized resin.
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