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PHYLOGENETIC RELATIONSHIPS WITHIN THE GENUS HYPNEA (GIGARTINALES, RHODOPHYTA), WITH A DESCRIPTION OF H. CAESPITOSA SP. NOV. 1
Author(s) -
Geraldino Paul John L.,
RiosmenaRodriguez Rafael,
Liao Lawrence M.,
Boo And Sung Min
Publication year - 2010
Publication title -
journal of phycology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.85
H-Index - 127
eISSN - 1529-8817
pISSN - 0022-3646
DOI - 10.1111/j.1529-8817.2009.00804.x
Subject(s) - biology , gigartinales , phylogenetic tree , genus , botany , monophyly , phylogenetics , clade , sporangium , disjunct , zoology , algae , population , demography , spore , sociology , biochemistry , gene
Species discrimination within the gigartinalean red algal genus Hypnea has been controversial. To help resolve the controversy and explore phylogeny within the genus, we determined rbc L sequences from 30 specimens of 23 species within the genus, cox 1 from 22 specimens of 10 species, and psa A from 16 species. We describe H. caespitosa as a new species characterized by a relatively slender main axis; a pulvinate growth habit with entangled, anastomosing, and subulate uppermost branches; and unilaterally borne tetrasporangial sori. The new species occurs in the warm waters of Malaysia, the Philippines, and Singapore. The phylogenetic trees of rbc L, psa A, and cox 1 sequences showed a distant relationship of H. caespitosa to H. pannosa J. Agardh from Baja California and the marked differentiation from other similar species. The rbc L + psa A tree supported monophyly of the genus with high bootstrap values and posterior probabilities. The analysis revealed three clades within the genus, corresponding to three sections, namely, Virgatae , Spinuligerae , and Pulvinatae first recognized by J. G. Agardh. Exceptions were H. japonica T. Tanaka in Pulvinatae and H. spinella (C. Agardh) Kütz. in Spinuligerae.