A new subfamily of ulmarid scyphomedusae, the Santjordiinae, with a description of Santjordia pagesi gen. et sp. nov. (Cnidaria: Scyphozoa: Discomedusae: Semaeostomeae: Ulmaridae) from the Sumisu Caldera, Ogasawara Islands, Japan Author Lindsay, Dhugal John Institute for Extra-cutting-edge Science and Technology Avant-garde Research (X-star), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokosuka, Kanagawa, Japan Author Grossmann, Mary Matilda 0000-0002-6800-6092 Okinawa Institute of Science and Technology (OIST), Onna, Okinawa, Japan & grossmann. mary @ gmail. com; https: // orcid. org / 0000 - 0002 - 6800 - 6092 grossmann.mary@gmail.com Author Montenegro, Javier Institute for Extra-cutting-edge Science and Technology Avant-garde Research (X-star), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokosuka, Kanagawa, Japan Author Morandini, André Carrara Departamento de Zoologia, Instituto de Biociências, Universidade de São Paulo, Rua do Matão, trav. 14, n. 101, São Paulo, SP, Brazil, 05508 - 090 & Centro de Biologia Marinha (CEBIMar), Universidade de São Paulo, Rod. Manoel Hipólito do Rego, km 131.5, São Sebastião, SP, Brazil, 11612 - 109 text Zootaxa 2023 2023-11-20 5374 4 533 551 https://mapress.com/zt/article/download/zootaxa.5374.4.5/52305 journal article 10.11646/zootaxa.5374.4.5 1175-5326 3EE99BAD-F9F3-41BA-A069-9F47CB03835E Subfamily Santjordiinae subfam. nov. New Japanese name: Sekijuujikurage-aka Ulmaridae in which the tentacles arise in linear clusters from the subumbrella; without subgenital pits; marginal and subumbrellar rhopalia; with narrow, tapering oral arms.