The species is listed as Vulnerable in view of its restricted habitat requirements (dense coastal forest with phytotelmata) and highly disjunct distribution in the fragmented coastal forests of Kenya and Tanzania (see also Clausnitzer and Lindeboom 2002, Clausnitzer 2003). The coastal forests of eastern Africa were once a continuous belt from southern Somalia down to Mozambique. Today these forests only exists in tiny and highly fragmented patches. Coryphagrion grandis depends on this habitat and the remaining populations are thus highly isolated. It is also affected by genetic flow and re-occupation of areas, e.g., after severe droughts is hindered (e.g., Groenveld 2003). Even without further forest destruction, the survival of all populations in future seems unlikely, unless corridors are constructed. It is listed as Vulnerable.
No information available but research into population numbers and range, conservation measures, and trends/monitoring of the species would be valuable. Habitat and site-based actions are also required.
Dijkstra, K.-D.B. and Clausnitzer, V. 2005. An annotated checklist of the dragonflies (Odonata) of eastern Africa, with critical lists for Ethiopia, Kenya, Malawi, Tanzania and Uganda, new records, taxonomic notes and descriptions of new species. in prep.
IUCN. 2010. IUCN Red List of Threatened Species (ver. 2010.3). Available at: http://www.iucnredlist.org. (Accessed: 2 September 2010).