article_snippet: G. dennerle is purple in colour with a cream patch on G. dennerle back, while G. hagen has a bright orange shell and claws which stand out against the rest of G. dennerle dark body, according to the study published in the Raffles Bulletin of Zoology.
article_snippet: This image shows the bright purple colouring of G. dennerle, which has striking yellow eyes like some fictional vampires - hence its nickname .