Rugulopteryx okamurae (E.Y. Dawson) I.K. Hwang, W.J. Lee & H.S. Kim, 2009

Belleza, Dominic Franco C., Tateishi, Hiroto, Tanimae, Shin-Ichiro, Kobayashi, Taishun, Aota, Tomoyuki, Urasawa, Toshiki & Nishihara, Gregory N., 2025, An annotated list of brown seaweeds (Phaeophyceae) from Nakadori Island (northern Goto Islands, Nagasaki, Japan), Phytotaxa 694 (1), pp. 1-24 : 10

* Rugulopteryx okamurae (E.Y. Dawson) I.K. Hwang, W.J. Lee & H.S. Kim, 2009

Japanese name: フクリンアミジ (fukurin-amiji)

Basionym: Dilophus okamurae E.Y. Dawson, 1950

Syntype localities: —Hizen, Kyushu; Iyo, Shikoku; Sagami, Iwaki and Rikuzen, Eastern Honshu

Description and remarks: —The thalli are slender and upright, 1.5–14 cm tall, attached to the substrate through fine rhizoids and may form dense , bushy, tangled clumps. Branches are dichotomous with obtuse tips. Fresh specimens are light brown on the upper parts and dark brown close to the base and do not exhibit iridescence unlike some species of Dictyota . Some individuals exhibit the stoloniferous fibers from the holdfast ( Hwang et al. 2009).

This species is common in all of the study sites except Aokata and was present year-round. This species is also common along the shallow waters of the western Pacific coasts of Japan, Korea, China, Taiwan and Philippines ( Hwang et al. 2009). However, it has been detected in the Mediterranean coast of France and was determined to be inadvertently introduced together with Japanese Oysters ( Crassostrea gigas ) used for aquaculture ( Verlaque et al. 2009).

Materials examined: —18ECS1-5 (2 to 17)