Occurrence of box crab Calappa bilineata (Ng, Lai & Aungtonya, 2002) from Gulf of Mannar, Southeast coast of India

The members of the genus Calappa are distributed in the tropical and subtropical ocean in the shallow coral reef areas and are commonly called box crabs or Shame-faced crabs. Calappa, are important crab species landed by the industrial trawl fleet in Venezuela with an annual average landing of 69 tonnes. There are nearly 41 extinct species under this genus. Fossils of Calappa protopustulosa have been recorded at Mizoram, Northeastern India. This group of crabs can completely bury under the soft substrata in the sea