Carpenter, 1873
Oval animals of medium size, valve sculpturing varying from almost smooth to micro-granular with the lateral areas only slightly raised and weakly defined. Typically coloured in bright reds, pinks and oranges often with a mottling of other colours. The head valve and tail valve have many notches in their insertion plates, the intermediate valves typically have a single pair of notches. Valves 2-8 have strong, rounded sutural laminae. The girdle appearance ranges from leathery to finely granular, and is covered by different sized granules and bordered by a row of spines. All the members of this genus are merobranchial.
Source: Jones and Baxter, 1987.
The following species occur in the region:
Tonicella marmoreus
Tonicella rubra