Lindsay, D. J.; Grossmann, M. M.; Montenegro, J.; Morandini, A. C. (2023). 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. Zootaxa. 5374(4): 533-551.
Lindsay, D. J.; Grossmann, M. M.; Montenegro, J.; Morandini, A. C.
2023
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
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.