High-capacity facilitative transporter for trehalose, required to induce anhydrobiosis. Anhydrobiotic larvae can survive almost complete dehydration. Does not transport maltose, sucrose or lactose. Mediates the bidirectional transfer of trehalose. Responsible for the transport of trehalose synthesized in the fat body and the incorporation of trehalose into other tissues that require a carbon source, thereby regulating trehalose levels in the hemolymph. Wide extracellular pH range, between 4.0 and 9.0. Highest expression in the fat body. Not expressed in other tissues including the midgut, muscle, and integuments after 24 h of dehydration. By hypersalinity. Belongs to the major facilitator superfamily. Sugar transporter (TC 2.A.1.1) family. Trehalose transporter subfamily.