Sanamyan N.P.1, Sanamyan K.E.1*, Kukhlevskiy A.D.2, Savinkin O.V.3 2026. A new species of Edwardsianthus (Actiniaria: Edwardsiidae), with an overview of the genus and patterns of development of tentacles and mesenteries in the family // Invert. Zool. Vol.23. No.1: 25–50 [in English].
1 Kamchatka Branch of the Pacific Geographical Institute, Far Eastern Branch, Russian Academy of Sciences, ul. Partizanskaya 6, Petropavlovsk-Kamchatsky 683000 Russia.
2 A.V. Zhirmunsky National Scientific Center of Marine Biology, Far Eastern Branch, Russian Academy of Sciences, ul. Palchevskogo 17, Vladivostok 690041 Russia.
3 A.N. Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, Leninsky Pr. 33, Moscow 119071 Russia.
* Corresponding author
Nadya Sanamyan: actiniaria@sanamyan.com ORCID https://orcid.org/0000-0002-9987-0668
Karen Sanamyan: actiniaria@sanamyan.com ORCID https://orcid.org/0000-0002-7460-3985
Andrey Kukhlevskiy: ad.kukhlevskiy@gmail.com ORCID https://orcid.org/0000-0001-6408-1362
Oleg Savinkin: o.savinkin@mail.ru ORCID https://orcid.org/0009-0009-1830-7610
doi: 10.15298/invertzool.23.1.02
ABSTRACT: The burrowing sea anemone Edwardsianthus vostok sp.n. is described from the shallow waters of Vostok Bay, Peter the Great Gulf, Sea of Japan, where it commonly inhabits dense aggregations of phoronids. It is the first record of the genus Edwardsianthus for Russian waters. Previously, Edwardsianthus species were known only from tropical and subtropical waters of the Pacific and Indian Oceans. Edwardsianthus vostok sp.n. is most closely related to E. gilbertensis but has much larger nematocysts in the nemathybomes, a different arrangement of the tentacles, lacks zooxanthellae, and is distinguished on the basis of molecular data. An overview of all nominal species assignable to Edwardsianthus is presented; the specimens of its type species, E. pudicus, collected in Vietnam, are examined. Patterns of development of tentacles and mesenteries in the family Edwardsiidae are discussed. It has been shown that secondary micronemes form not only exocoelically but also endocoelically, and not just in pairs but also bilaterally.
KEY WORDS: taxonomy, biodiversity, Sea of Japan, Actiniaria, Edwardsiidae, Edwardsianthus.