The Cumberland slider (Trachemys scripta troostii) is another slider sub-species that is available in the pet trade. It has been found in Swan Lake and Durrance Lake in the Capital Regional District. Vancouver Island.
The turtle below from Swan Lake appears to be an adult female Cumberland slider (Trachemys scripta troostii). Identifying characters are the colour of the postorbital stripe (orange), the colour and pattern of the skin between the limbs, and the shape of the ocelli on the plastral bridge. The Cumberland slider is a variable race, which at one end of the color/pattern spectrum closely resembles T. s. elegans, whereas T. s. elegans from some areas closely resemble T. s. troostii (C Rombough, pers. obs. 2011).
Accurate identification is further complicated by the fact that T. s. troostii bred for the pet trade frequently hybridize withT. s. elegans. So although this does look like T. s. troostii, it could also be a T. s. elegans, or a mix of the two ( C. Rombough, pers. comm. 2011).