Calcinus Dana, 1851

Remarks. Calcinus is a tropical to subtropical genus distributed from supratidal and intertidal habitats all the way down to deeper slopes. Most species are associated with coral reefs. Calcinus species are typically very colourful, and live colouration is invaluable in species identification (e.g., Poupin & McLaughlin, 1998; Poupin & Lemaitre, 2003).

Of the 45 described species of Calcinus, 33 occur in the Indo-West Pacific, with diversity peaking in oceanic islands (Malay & Paulay, 2010). Ten species have been previously reported from the Philippines (Estampador, 1937, 1959; Buitendijk, 1937; Yap-Chiongco, 1938; Malay & Paulay, 2010) and nine of them were collected by the PANGLAO 2004 Expedition.