Probathylepadidae, a new family of Scalpelliformes (Thoracica: Cirripedia: Crustacea), for Probathylepas faxian gen. nov., sp. nov., from a hydrothermal vent in the Okinawa Trough Author Ren, Xian-Qiu Author Sha, Zhong-Li text Zootaxa 2015 4033 1 144 150 journal article 10.11646/zootaxa.4033.1.9 9cb1312c-3603-4dc7-8441-373bd1d74e72 1175-5326 242718 76060909-81C3-4AAC-BC5F-3A9318C32CDD Key to recent families of Order Scalpelliformes 1. Number of capitular plates 6–8, without whorls of imbricating plates............................................. 2 - Number of capitular plates 8 or more, usually with whorls of imbricating plates....................................3 2. Number of capitular plate 8, base of peduncle with calcareous plate..................................... Lithotryidae - Number of capitular plates 6–8, base of peduncle without calcareous plate............................... Eolepadidae 3. Peduncle naked................................................................. Probathylepadidae fam. nov. - Peduncle generally furnished with definite scales............................................................ 4 4. Male with distinct capitulum and peduncle......................................................... Calanticidae - Male without distinct capitulum and peduncle...............................................................5 5. Number of capitular plates more than 18.......................................................... Pollicipidae - Number of capitular plates less than 18........................................................... Scalpellidae