WAcanthopleura is a genus of chitons in the family Chitonidae. In this genus the girdle is spiny or spiky. It has eight described species at present.
WCallistochiton is a genus of polyplacophoran molluscs, alive today, of which fossils are known from the Pliocene period onwards.
WCallochiton is a genus of chitons in the family Callochitonidae.
WCryptoplax is a genus of polyplacophoran molluscs. The genus consists of the following living species:Cryptoplax burrowi E. A. Smith, 1884 Cryptoplax caledonicus Rochebrune, 1882 Cryptoplax dawydoffi Leloup, 1937 Cryptoplax dimidiata Ang, 1967 Cryptoplax dupuisi Ashby, 1931 Cryptoplax elioti Pilsbry, 1901 Cryptoplax hartmeyeri Thiele, 1911 Cryptoplax iredalei Ashby, 1923 Cryptoplax japonica Pilsbry, 1901 Cryptoplax larvaeformis Burrow, 1815 Cryptoplax mystica Iredale & Hull, 1925 Cryptoplax oculata Quoy & Gaimard, 1835 Cryptoplax plana Ang, 1967 Cryptoplax propior Is. & Iw. Taki, 1930 Cryptoplax royana Iredale & Hull, 1925 Cryptoplax striata Lamarck, 1819 Cryptoplax sykesi Thiele, 1909
WCyanoplax is a genus of chitons in the family Lepidochitonidae.
WHanleya is a genus of polyplacophoran molluscs known from Oligocene and Miocene fossils; it is represented today by a number of species including H. sinica Xu 1990 (China), H. brachyplax (Brazil) and H. hanleyi Bean in Thorpe, 1844 (Chile), which feeds on sponges.
WKatharina is a genus of chitons in the family Mopaliidae.
WLepidochitona is a genus of chitons. It has been included in the families Tonicellidae, Ischnochitonidae, and Lepidochitonidae.
WLepidozona is a genus of chitons belonging to the family Ischnochitonidae.
WLeptochiton is a genus of polyplacophoran molluscs.
WMopalia is a genus of chitons in the family Mopaliidae.
WNotoplax is a genus of chitons in the family Acanthochitonidae.
WPlaciphorella, the veiled chiton, is a genus of polyplacophoran molluscs with precephalic tentacles, which are used in feeding.
WStenoplax is a genus of polyplacophoran molluscs.
WSypharochiton is a genus of chitons in the family Chitonidae.
WTonicella is a genus of chitons known as the lined chitons. The genus name derives from the Greek tonos and cell (diminutive).