Abstract
The extant and fossil marine mollusc faunas of Aotearoa New Zealand are relatively well known. A total of 4371 extant species and subspecies are presently recognised, of which 80% are endemic to New Zealand. This total represents a 19% increase (688 taxa) since Spencer et al. (2009) (Table 14.1; Figs 14.1, 14.2). Of these, 2,491 species are named, and 1,880 are known, undescribed species. About 7,000 species are known from the fossil record, which includes many extant taxa. A checklist of the extant marine Mollusca is provided here. A comprehensive revision of the taxonomic treatments of extant taxa, including listings of unnamed taxa, new synoymies and resurrections from synonymy is currently in preparation (Marshall, B.A. (Ed.) in prep.). Extinct marine mollusc taxa are not reviewed here.