Siboglinidae Caullery, 1914
publication ID |
https://doi.org/ 10.1080/14772019.2017.1412362 |
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https://doi.org/10.5281/zenodo.10912362 |
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https://treatment.plazi.org/id/03C0814B-9036-FFB0-3F43-F8F84F12FC77 |
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Felipe |
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Siboglinidae Caullery, 1914 |
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?Family Siboglinidae Caullery, 1914 View in CoL
‘Murdock Creek tubes’
( Fig. 5 View Figure 5 )
Material. WA-MC LACMIP loc. 6295, one spiralling tube ( Fig. 5A View Figure 5 ), another tube with a ~ 90 º bend, and a smaller tube observed in thin section only. Donated by J. L. Goedert.
Occurrence. Murdock Creek, Clallam County, Washington State, USA (~ 48 º 9 ' N, 123 º 52 ' W). Loose seep carbonate blocks. Pysht Formation, late Early Oligocene ( Goedert & Squires 1993; Kiel & Amano 2013; Vinn et al. 2013).
Description. Carbonate tubes 0.7–3.0 mm in diameter, appearing non-branched, non-agglutinated and nontapering in the tube fragments observed. The spiralling tube ( Fig. 5A View Figure 5 ) appears to have coarse longitudinal wrinkles on its surface, but whether these are original is uncertain. In thin section, tube walls are thick and concentrically multi-layered ( Fig. 5B–D View Figure 5 ), and occasionally delaminated ( Fig. 5B View Figure 5 ). Some of the tubes appear to have originally been flexible ( Fig. 5C View Figure 5 ) and to have had fibrous walls due to visible preserved wall tears in thin section ( Fig. 5D View Figure 5 ).
Remarks. These tubes appear to have been organic originally due to preserved tube wall tears that reveal a fibrous nature. The size of the tubes, their thick, multi-layered walls and the spiralling that they exhibit suggest that the tubes may have been made by vestimentiferans, as the combination of these features are not commonly encountered in other organic tube-building annelids that occur at vents and seeps. Due to a limited amount of material available for study, and as these tubes were only resolved among those of siboglinids when homoplastic characters are downweighted less within cladistic analyses ( Fig. 23B View Figure 23 ), the tubes are only tentatively assigned to the siboglinids.
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