Cyrtodactylus pubisulcus — Inger’s Bent-toed Gecko
Some other names for this species:
Inger’s Bow-fingered Gecko
If I had seen this gecko in Peninsular Malaysia, I would have been confident that it was Cyrtodactylus quadrivirgatus. That species is found in Borneo as well as in Peninsular Malaysia, but as far as I have been able to discover the ones that look like this on the Santubong Peninsula are C. pubisulcus.
These two have such different overall appearance that I wouldn't be surprised if they turned out to be different species, but as far as I have been able to tell they are just "dark phase" and "light phase" C. pubisulcus.
Last year at Kubah I didn't see any small Cyrtodactylus at all, only the significantly larger Cyrtodactylus consobrinus. This year I saw a number of the little ones. I think that I saw both Cyrtodactylus quadrivirgatus and this similar but differently-patterned species, but I wouldn't be too surprised if these were really those, or those were really these.
To my knowledge, Cyrtodactylus pubisulcus is the only small Cyrtodactylus at the lower elevations of Mulu National Park. Cyrtodactylus baluensis is known from the highlands, but we didn't go up high.