Distributional range of the two species from the field surveys (a) and historical range data of distribution, based on the published data (b).

The dotted line represents the range of Africorchestia. quadrispinosa and the solid line the range of Talorchestia. capensis. The star symbols represent the range of the entire sampling area (a.) The ellipse indicates three biogeographical regions (b): Cool Temperate (CT), Warm Temperate (WT), Sub-Tropical (ST), [33]. The ST region has a transition zone which includes the limit of distribution of Talorchestia capensis. Latitudes are reported on the left side of the map.