Ecological Risk Screening Summary - Ptychognathus altimanus (a crab, no common name) - Uncertain Risk

Species that are considered uncertain risk need a more in-depth assessment beyond the Risk Summary to better define the species’ risk to U.S. environments.

Ptychognathus altimanus is a crab species native to Japan, Indonesia, the Philippines and the Solomon Islands. It is a mainly described as a brackish water species. No information was found regarding whether marine or freshwater environments are required for reproduction of this species. Ptychognathus altimanus has not been reported outside of its native range. The history of invasiveness for this species is classified as No Known Nonnative Population. The climate match for the contiguous United States was Low. The entire contiguous United States had a low climate match except the southern tip of Florida, which had a medium match. Due to the lack of information regarding the needed environment for reproduction, the results of the climate match only refers to where the species may be able to survive and not necessarily where it can reproduce. The certainty of assessment is Low due to a lack of information. The overall risk assessment category for Ptychognathus altimanus is Uncertain.