Cassidae

Latreille, 1825

Cassinae

Latreille, 1825

Cassis

Scopoli, 1777

The genus Cassis are characterized by large globular shells which have a broad parietal shield, a strongly upturned siphonal canal, and a thick outer lip bearing tubercles. The horny operculum is proportionately very small and is oblong in shape. Cassis feed mainly on sea urchins.

[Indo Pacific Mollusca, Vol 2 No 9. 1968. p12-463]
Cassis nana

Phaliinae

Beu, 1981

Phalium

Link, 1807

The shells in this genus are medium-sized, usually having a length ol about 25 to lOO mm. The spire is acuminate and the last whorl well-rounded. Usually the false umbilicus (or siphoual fasciole umbilicus) and the true umbilicus are open. Many species have 1 to 7 former varices showing in the spire. The parietal shield is moderately developed, especially at the lower left region. The thick outer lip bears one row of denticles which in some species are produced into spines at the lower end. The operculum is chitinous and fan-shaped.

[Indo Pacific Mollusca, Vol 2 No 9. 1968. p12-529]
Phalium areola
Phalium glaucum

Casmaria

H. Adams & A. Adams, 1853

The genus Casmaria contains two tropical species whose small, glossy shells are characterized hy an elongate shape, a columellar shield that is smoothish and poorly developed, and by one or two rows of sharp denticles on the outer lip. The false, or siphonal, umbilicus is closed.
Both species exhibit two extreme shell forms, smooth and light-weight, the other strongly noduled and thick-shelled. Spiral sculpture is virtually absent.
The first two nuclear whorls are hounded at the suture by a microscopic dark-brown line. There is always a black-brown blotch on the siphonal canal. The operculum is fan- shaped to ovate, and bears three small reinforcement bars on the inner attachment side.

[Indo Pacific Mollusca, Vol 2 No 9. 1968. p12-701]
Casmaria ponderosa
Casmaria ponderosa

Semicassis

Mörch, 1852

The shells in this genus are somewhat globular, rarely with former varices in the spire, usually with numerous spiral threads or incised lines on the outside, usually with rows of squarish, yellowish spots, with a wrinkled columellar shield, and a finely denticulated, thickened outer lip. The base of the outer lip lacks terminal spines, and the longitudinally threaded siphonal fasciole lacks the single, raised ridge found in Echinophoria. The opercullum is fan-shaped and may be smoothish or strongly sculptured radially.

[Indo Pacific Mollusca, Vol 2 No 9. 1968. p12-601]
Semicassis angasi
Semicassis bisulcata
Semicassis thompsoni