This is a very interesting group related to the harps, and similar in general shape to helmets and bonnets; in fact the whole genus was considered part of the Cassidae family for a long time. The largest species is Morum grande, a shell which can reach over 3". But most species are in the 1-2" range. The vast majority of morum inhabit deeper water and are closely associated with sandy areas, which are accessible only through deep-water dredging. Because some species occur in extremely remote areas of the globe, the family holds some of the rarest, most expensive and impossible to obtain shells; such as the coveted Morum veleroae and Morum exquisitum, two shells which are not only unaffordable but basically unavailable at all.
35.7mm. Lipol, Balut Is. Philippines.
UNCOMMON - A gently sculptured species, with rounded shoulder and evenly, finely beaded dorsum.
Powell, A.W.B., 1958
39.1mm. Stylaster seamount, Norfolk ridge.
VERY RARE - A lovely colored species. It comes from a very remote part of the world. Even dead shells, like this one are a treasure.
46.8mm. East China Sea.
COMMON - This species offers a wide range in size and shape, it is easily confused with similarly shaped and colored Morum.
Reeve, L.A., 1842
51.5mm. Los Monjes, Venezuela.
RARE - The most famous secies of the genus and a former great rarity. This is a large, 2"+ shell, with a vermillion parietal wall.
44mm. Balut Is. Philippines.
UNCOMMON - Confined to the central Philippines. This is one of the more colorful species, with a yellow tinted parietal shield.
Petuch, E.J., 1987
36.8mm. Cabo de La Vela. Colombia.
RARE - An attractive, medium-sized shell, with a cancellated surface and a colorful parietal shield, which can vary greatly in hue.
Sowerby III, 1889
43.2mm. Kominato. Japan.
RARE - Easily confused with other white shielded Morum, this has rounded knobbs instead of ridges. Today extra rare.
Emerson, W.K., 1967
31.6mm. Fortaleza, Brazil.
UNCOMMON - This is the "black" form: A gorgeous little shell that looks like a ripe blackberry. This specimen is very large.
34.5mm. Okinawa. Japan.
RARE - A heavy, compact shell, that despite having a wide range and living in shallow water, is almost never seen alive.
29.6mm. Kingstown. St. Vincent.
RARE - Extremely attractive: Similar to M. oniscus, but bigger, with a pink to flesh colored parietal shield.
Habe, T., 1961
64.8mm. East China Sea.
UNCOMMON - A larger Morum, and readily confused with M. grande. It differs in having smoother parietal shield and pyriform shape.
36.2mm. Zamboanga. Philippines.
COMMON - Like a minature M. grande, but stockier and more frilly. The portrayed shell is exceptionally nice, with long scales.