[1][2] Schistometopum gregorii is endemic to the coastal East Africa in Kenya and Tanzania; it is known from the Tana River Delta area in Kenya (its type locality) and between Bagamoyo and Rufiji River in Tanzania.

[1] The specific name gregorii honours John Walter Gregory, a British geologist and explorer[3] and the collector of the holotype.

[4] Schistometopum gregorii is glossy black dorsolaterally and somewhat lighter ventrally.

[4] The species has been found in black mud near rivers and agricultural areas (e.g., rice paddies).

There are no known major threats affecting this ecologically poorly known species.