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New Systematic Insights in the Ceramium Sinicolacomplex : Resurrection of C. Interruptum S. & G. (Ceramiaceae, Rhodophyta)
Author(s) -
Cho T. O.,
Fredericq S.,
Murray S. N.,
Boo S. M.
Publication year - 2002
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 - 10.1046/j.1529-8817.38.s1.2.x
Subject(s) - biology , taxon , phylogenetic tree , epiphyte , genus , clade , rubisco , botany , phylogenetics , evolutionary biology , gene , genetics , photosynthesis
Setchell & Gardner (1924) provided a taxonomic treatment for the genus Ceramium from lower California and the Gulf of California, Mexico, in which they described several new species, including C. sinicola S. & G. described from Ensenada, BCN and C. interruptum S. & G. described from the vicinity of La Paz, BCS. The latter was later reduced to variety rank in C. sinicolaby Dawson (1950), a taxonomic decision that has subsequently been widely adopted. Phylogenetic analyses inferred from three molecular markers (chloroplast‐encoded rbcL , the RUBISCO spacer, and nuclear encoded SSU rDNA) from recent collections from the Pacific North‐west (California, Oregon) and the Gulf of California reveal a well supported assemblage of three corticated taxa: C. codicolaJ. Ag. 1894, C. sinicola and C. sinicola var. interruptum . Sequence divergence values among the three taxa are sufficient to warrant separate species ranking; hence, we reinstate C. interruptum as a widely distributed epiphyte for the region. C. sinicolais more closely related to C. codicolathan to C. interruptum , with the former two restricted to the host Codium . The molecule‐based relationships are congruent with evolutionary trends in cortication pattern and attachment mode.