The Ridged Egg Cowry (Pseudosimnia culmen) is a small tropical ovulid cowry that belongs to the family Ovulidae. This species is known to occur in the warm tropical waters of the Indian and western Pacific Oceans and has been recorded from Africa, Japan, Papua New Guinea and the Great Barrier Reef in Australia. The individual illustrated above and below is the most southern recorded of this species as it was photographed in Port Stephens in New South Wales – Australia.
This species can be found on coral reefs feeding on soft corals including Dendronephthya sp. This species can be recognised by approximately 7 brown spots found on its shell and a bright golden-orange line encircling the periphery of the shell at the sides and over the terminal beaks. The mantle has well developed papillae that are coloured white and the mantle colour is generally red or pink.
The Ridged Egg Cowry (Pseudosimnia culmen) grows to a maximum length of approximately 1.2cm.