. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. SIBOGLINID EVOLUTIONARY HISTORY 69 e; 99 100 100 1 100 ipirooracnia I Polybrachia _l g1 Galathealmum ^— Siboglinumekmani 100 r Siboghnum fiordicum GB Siboglinum fiordicum 86. 58 (D 96 59 Escarpia Ridgeia RidgeiaGB Oasisia — Riftia Tevnia Lamellibrachia Sderolinum ^— Enchytraeus -Oligochaete ^^^^^^—^^— Haemopis -Leech Moniliferan Sabella - Polychaete Paralvinella - Polychaete Phascolosoma -Sipunculid Ochetostoma - Echiund Chaetopterus - Polychaete Glycera Polychaete —^^—— Lineus Nemertean Scutopus Mollusk Artemia - Arthropod
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. SIBOGLINID EVOLUTIONARY HISTORY 69 e; 99 100 100 1 100 ipirooracnia I Polybrachia _l g1 Galathealmum ^— Siboglinumekmani 100 r Siboghnum fiordicum GB Siboglinum fiordicum 86. 58 (D 96 59 Escarpia Ridgeia RidgeiaGB Oasisia — Riftia Tevnia Lamellibrachia Sderolinum ^— Enchytraeus -Oligochaete ^^^^^^—^^— Haemopis -Leech Moniliferan Sabella - Polychaete Paralvinella - Polychaete Phascolosoma -Sipunculid Ochetostoma - Echiund Chaetopterus - Polychaete Glycera Polychaete —^^—— Lineus Nemertean Scutopus Mollusk Artemia - Arthropod Priapulus- Priapulid 0-01 substitutions/site Figure 1. Results of 18S rDNA phylogenetic analyses. The single best likelihood tree (Ln likelihood = — found. Analysis details are given in the text. Maximum likelihood bootstrap values of >50% are given in bold. Parsimony (italicl and neighbor joining (underlined) values are also given for the major nodes of interest (values for other nodes were omitted in the interest of space). Branch lengths are drawn proportional to the inferred amount of change along the branch (scale shown). only alignment are only slightly greater than the full align- ment values, the greatest distance within vestimentiferans was only (with a maximum of 25 nucleotide differ- ences), revealing that there was very little 18S genetic diversity within this group. The 16S rDNA data set consisted of 24 OTUs, each with 497 nucleotide positions. Of the 465 nucleotide positions that could be unambiguously aligned, (281 positions) were variable and (222 positions) were parsimony informative. The reconstructed topology (Ln likelihood = ). Figure 2, was qualitatively similar to the 18S topology. Siboglinids are divided into two major lin- eages: vestimentiferans plus the moniliferan Sderolinum brattstromi (bootstrap support 83% for ML and 100% for NJ and parsimony) and a frenulate sister-clade (bootstrap suppo
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
