Patelloida pygmaea
Patelloida pygmaea is a species of sea snail, a true limpet, a marine gastropod mollusk in the family Lottiidae, one of the families of true limpets. Description
Oval shape (eggshell shape) limpet with varying colours on the shell. Usually spots on greyish-brown or pale-white background with regular edge. Distribution
Distributed around Yellow Sea of Mainland China, as well as Taiwan. Living in inter-tidal area, bay area with sheltering. Often appears around places where oysters are growing. References

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Lottiidae
Gastropods described in 1860