Pseudochromis ransonneti seems to be the only member of the genus to be recorded from Singapore waters. The apparent courtship behavior in the present observation indicates that it does not differ from that recorded of congeners that have been bred in captivity. The male performs an undulating swimming display to lure the female to a hole, crevice or burrow to spawn. The eggs are produced in a mass that is not fixed to the substrate. After the male fertilizes the eggs, he usually chases the female away from the nest. The eggs are guarded by the male until they hatch in 5 to 6 days. Pseudochromis species change sex, usually from female to male, and the males tend to be larger (Michael, 2004: 104-107). However, in the present observation, the apparent female seems to be the larger one. As both fish were not in the burrow at the same time, it is unlikely that spawning had occurred. The female could have found the burrow unsuitable after inspecting it

Singapore is the type locality of this species (Allen & Erdmann, 2012) which has cryptic habits and is seldom seen in the open.

Opinions and declarations Rendered by the International Commission on Zoological Nomenclature

Opinions and declarations Rendered by the International Commission on Zoological Nomenclature

Opinions and declarations Rendered by the International Commission on Zoological Nomenclature

Members of the eumedonid crabs are known obligates on sea-urchins. Zebrida adamsii is widely distributed throughout the Indo-West Pacific (Ng & Chia, 1999), and has been documented on one occasion in Singapore (Johnson, 1962). This is believed to be the first record of the species on Changi Beach. The host sea urchin was found with a naked inter-ambulacral zone (as indicated by the white arrow in Fig. A), which could be due to Z. adamsii feeding on the urchin’s tube-feet and tissues (Saravanan et al., 2015). This suggests that the crab is parasitic on the sea urchin.