n. pl.1.(Zool.) A division of gastropod Mollusca, including the chitons. The back is covered by eight shelly plates. Called also Polyplacophora. See Illust. under Chiton, and Isopleura.
References in periodicals archive ?
Ptycta aaroni KF651837 KF499151 Ptycta apicantha KF651858 KF499172 Ptycta diadela KF651853 KF499167 Ptycta diastema KF651845 KF499159 Ptycta distinguenda KF651861 KF499175 Ptycta frogneri KF651913 KF499227 Ptycta giffardi KF651846 KF499160 Ptycta haleakalae KF651884 KF499198 Ptycta hardyi KF651863 KF499177 Ptycta johnsoni KF651899 KF499213 Ptycta kauaiensis KF651891 KF499205 Ptycta leucothorax KF651872 KF499186 Ptycta lobophora KF651876 KF499190 Ptycta maculifrons KF651860 KF499174 Ptycta microglena KF651883 -- Ptycta molokaiensis KF651851 KF499165 Ptycta monticola KF651892 KF499201 Ptycta palikea KF651895 KF499209 Ptycta pikeloi KF651849 KF499163 Ptycta placophora KF651840 KF499153 Ptycta sp.
Fine structure of external 'genital" papillae in the freshwater mite Hydrovolzia placophora (Hydrovolziidae, Actinedida, Actinotrichida, Acari).