Bibliographic Detail
Hwang, I-K., Lee, W.J., Kim H.-S & De Clerck, O., 2009
Reference:
Hwang, I-K., Lee, W.J., Kim H.-S & De Clerck, O. (2009). Taxonomic reappraisal of Dilophus okamurae (Dictyotales, Phaeophyta) from the western Pacific Ocean. Phycologia 48: 1-12.
Publication Date:
2 January 2009
Abstract:
Dilophus okamurae, a common species of brown alga in the warm temperate western Pacific Ocean (Philippines, Taiwan,
China, Korea and Japan), is characterized by a typical vegetative morphology that would support its traditional
placement in the genus Dilophus. The species has a unilayered cortex, and the medulla is multilayered at least near the
margins of the thallus. Sporangia on a two-celled stalk, without an involucrum, however, indicate a close relationship
with the recently described genus Rugulopteryx. Molecular phylogenetic analyses, based on three separate loci, large
subunit rDNA (LSU), rbcL and psbA confirm the close phylogenetic relationship between D. okamurae and R. radicans,
and R. marginatus and R. suhrii. A transfer of D. okamurae to the genus Rugulopteryx is therefore proposed. Contrary
to the expected diplobiontic life cycle, typically encountered in Dictyotales, the species exhibits an asexual life cycle
consisting of sporophytes only in the populations studied on the east and south coast of Korea. Gametophytes were
only obtained by culturing field collected specimens.
