dc:description"Figure 6. ‘Canyon River tubes’, Oligocene, Washington State, USA. A–C, WA-CR LACMIP 16957; A, large-diameter tubes in hand specimen; B, smooth small-diameter tubes; C, small-diameter tube with longitudinal wrinkles. D–F, JLG 473; D, delaminated tube wall with a fragment of preserved multi-layered tube wall (white arrow); E, uncompressed transverse section of a small diameter tube; F, detail of tube wall showing fluorescent bands that likely indicate the presence of preserved organic matter from the tube wall, imaged using confocal laser scanning microscopy (see online for colour version). Scale bars: A = 20 mm; B = 5 mm; C = 3 mm; D = 150 µm; E = 300 µm; F = 30 µm.";
dc:description"Figure 22. Strict consensus cladogram of the three most parsimonious trees of tubes built by a total of 43 modern annelid taxa (best score = 14.344, consistency index = 0.308, retention index = 0.629). The analysis was based on the 48 mostly morphological tube characters and was performed using implied character weighting (k = 3). Numbers on nodes represent groups present/contradicted support values. Symbols/colours indicate taxonomic affinities.";
dc:description"Figure 24. Fourier transform infrared (FTIR) spectroscopy spectra of the organic tubes of vent and seep annelids. Spectra are offset on the absorbance axis, and key spectral absorbance peaks are labelled with the types of chemical bonds they represent: -NH, nitrogenhydrogen; -CH, carbon-hydrogen; -OH, oxygen-hydrogen. The regions of the tube analysed are as follows: Tevnia jerichonana (anterior, inner tube wall); Zenkevitchiana longissimi (middle, outer tube wall); Lamellibrachia anaximandri (posterior, outer tube wall); Sclerolinum contortum (anterior, outer tube wall); Alvinella sp. (middle); Spiochaetopterus izuensis (middle, outer tube wall).";
