Genome Report: De novo genome assembly of the greater Bermuda land snail, Poecilozonites bermudensis (Mollusca: Gastropoda), confirms ancestral genome duplication.

Poecilozonites bermudensis, the greater Bermuda land snail, is a critically endangered species and one of only two extant members in its genus. These snails are one of Bermuda's few endemic animal clades and their rich fossil record was the basis for the punctuated equilibria model of speciation. Once thought extinct, recent conservation efforts have focused on the recovery of the species, yet no genomic information or other molecular sequences have been available to inform these initiatives. We present a high-quality, annotated genome for P. bermudensis generated using PacBio long reads and Hi-C long-range reads sequencing. The resulting assembly is approximately 1.36 Gb with a scaffold N50 of 44.8 Mb and 31 chromosome-length scaffolds. Nearly 43 percent of the genome was identified as repeat content. This assembly confirms that a whole genome duplication occurred near the base of Stylomatophora. The genome will serve as a resource for conservation efforts of the surviving Poecilozonites species and adds to the currently limited body of genomic data on gastropod evolution.