Physical Characteristics

The shell of California lampshells is medium to moderately large in size, with an adult dimension of 0.79-1.97 in (20-50 mm). The tan-colored shell is biconvex and may be smooth or ribbed. The pedicle is short to moderately long. The loop that supports the lophophore passes through one or more bilacunar phases. The lophophore is plectolophous, which means that it has longer lateral lobes and a coiled median lobe. Spicules occasionally occur scattered over the mantle canals. Dental plates are present. The ventral median septum (partition) is weak. Hinge plates are variably developed.

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