Sinum incisum
NameSinum incisum
Scientific NameSinum incisum
Common NameEar snail
FamilyNaticidae
GenusSinum
Speciesincisum
Geographic DistributionIndo-Pacific region, including areas such as the Philippines, Japan, and other parts of the Western Pacific.
Average Size (mm)25-30
Identifying FeaturesIts most distinguishing features are its extremely flattened, ear-like shape, the very large and wide aperture, and the almost entirely internal spire. The thin, somewhat translucent shell and characteristic blotchy color patterns also aid in identification.
Rarityrare
Author Citation(Reeve, 1864)
Description
The shell of Sinum incisum is notably flattened and ear-shaped (auriform), giving it a distinctive slipper-like appearance. It features a very large and wide aperture, which is characteristic of the genus. The spire is extremely depressed, almost entirely internal, making the shell appear nearly limpet-like from a dorsal view. The shell is relatively thin and somewhat translucent, with a smooth surface often marked by subtle growth lines.
