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Issue: Vol. 5374 No. 4: 20 Nov. 2023
Type: Article
Published: 2023-11-20
DOI: 10.11646/zootaxa.5374.4.5
Page range: 533-551
Abstract views: 4400
PDF downloaded: 301

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

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
Okinawa Institute of Science and Technology (OIST); Onna; Okinawa; Japan
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
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
Coelenterata deep sea medusa new species new genus submarine caldera

Abstract

An undescribed species of ulmarid medusa was observed in situ and captured at 812 m depth within the Sumisu Caldera, Ogasawara Islands, Japan. Morphological and molecular evidence points to it being distinct from other ulmarid medusae and a new species (pagesi), genus (Santjordia) and subfamily (Santjordiinae) are herein erected to contain it. This new subfamily of semaeostome ulmarid medusae has both marginal and subumbrellar rhopalia, making it unique within the order Semaeostomeae. Although the combination of subumbrellar tentacles and the lack of branched canals should warrant the erection of a new family within the Semaeostomeae, a lack of information on the gonad structure and poor bootstrap support in the molecular phylogenetic tree cause us to relegate it to the catch-all family Ulmaridae, until greater taxon sampling and phylogenetic analyses are carried out for the Semaeostomeae.

 

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