Molecular Biology and Evolution, Vol 13, 67-75, Copyright © 1996 by Society for Molecular Biology and Evolution
LK Medlin, WH Kooistra, R Gersonde and U Wellbrock
A phylogeny of the diatoms was inferred from comparisons of nuclear-
encoded small subunit ribosomal RNA coding regions using maximum
likelihood, weighted maximum parsimony, and neighbor-joining distance
methods with Jukes and Cantor, Kimura, Gamma, van de Peer, and LogDet
evolutionary models. Analyses of 30 taxa in 11 orders recovered two clades
(Clades I and II). Neither of these clades correspond to the three classes
of diatoms presently recognized or to the traditionally recognized radially
symmetrical centric diatoms or bilaterally symmetrical pennate diatoms. All
analyses show that the centric diatoms are a paraphyletic lineage. Tests of
alternative phylogenies that address existing hypotheses regarding diatom
systematics with the maximum likelihood and maximum parsimony methods
support the two clades. Clade I is defined by centric diatom orders with
specialized tubes, termed labiate processes, located peripherally in the
cell wall. Clade II contains (1) bi(multi)polar centric diatoms with
centrally located labiate processes, (2) centric diatoms with other central
tubes termed strutted processes, and (3) pennate diatoms. Morphological
evidence from fossil assemblages and cytological architecture support the
results of the molecular analyses, whereas morphological features of extant
diatoms are too derived to resolve the deeper branches in the tree.
ORIGINAL ARTICLE
Evolution of the diatoms (Bacillariophyta). II. Nuclear-encoded small- subunit rRNA sequence comparisons confirm a paraphyletic origin for the centric diatoms
Alfred Wegener Institute for Polar and Marine Research, Bremerhaven, Germany.
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