This group is regarded here as a full genus, following Marshall & Spencer (2013). Huber (2010) regarded it as a subgenus of Callista. This group is in urgent need of a detailed revision, including a molecular evaluation. This code is provided for use when identification of a specimen to this level is sufficient, or when no further detail is available.
Marshall, B.A., Spencer, H.G., 2013. Comments on some taxonomic changes affecting marine Bivalvia of the New Zealand region recently introduced in Huber's Compendium of bivalves, with some additional taxonomic changes., Molluscan Research, Vol. 33(1): 40-49.