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Middle and Late Jurassic tube-dwelling polychaetes from the Polish Basin: diversity, palaeoecology and comparisons with other assemblages

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Slowinski J., Vinn O., Jager M., Zaton M.

Acta Palaeontologica Polonica

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2022

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tom 67

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nr 4

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Microconchid tubeworms from the Jurassic of England and France

100%

Vinn O., Taylor P. D.

Acta Palaeontologica Polonica

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2007

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tom 52

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nr 2

The Bajocian tubeworm Spirorbis midfordensis, previously regarded as a spirorbid polychaete, is reinterpreted as a microconchid and assigned to Punctaconchus gen. nov. along with two new species, Punctaconchus ampliporus sp. nov. (Toarcian?, Aalenian–Bathonian), the type species of the new genus, and Punctaconchus palmeri sp. nov. (Bathonian). Microconchids are a mostly Palaeozoic group of tubeworms that are probably more closely related to modern lophophorate phyla than they are to polychaetes. Punctaconchus, the youngest unequivocal microconchid, is characterised by having large pores (punctae) penetrating the tube wall, which has a fibrous or platy lamellar microstructure, and ripplemark−like transverse ridges on the tube interior. In both morphology and ecology it is a remarkable homeomorph of the polychaete Spirorbis.

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Chaetopterid tubes from vent and seep sites: Implications for fossil record and evolutionary history of vent and seep annelids

88%

Kiel S., Dando P. R.

Acta Palaeontologica Polonica

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2009

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tom 54

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nr 3

443-448

Vestimentiferan tube worms living at deep−sea hydrothermal vents and cold seeps have been considered as a clade with a long and continuing evolutionary history in these ecosystems. Whereas the fossil record appears to support this view, molecular age estimates do not. The two main features that are used to identify vestimentiferan tubes in the fossil record are longitudinal ridges on the tube’s surface and a tube wall constructed of multiple layers. It is shown here that chaetopterid tubes from modern vents and seeps—as well as a number of fossil tubes from shallow−water environments—also show these two features. This calls for a more cautious interpretation of tubular fossils from ancient vent and seep deposits. We suggest that: current estimates for a relatively young evolutionary age based on molecular clock methods may be more reliable than the inferences of ancient “vestimentiferans” based on putative fossils of these worms; not all of these putative fossils actually belong to this group; and that tubes from fossil seeps should be investigated for chitinous remains to substantiate claims of their potential siboglinid affinities.

Ograniczanie wyników

3 Acta Palaeontologica Polonica

2 Vinn O.

1 Dando P. R.

1 Jager M.

1 Kiel S.

1 Slowinski J.

1 Taylor P. D.

1 Zaton M.

1 2022

1 2009

1 2007

Middle and Late Jurassic tube-dwelling polychaetes from the Polish Basin: diversity, palaeoecology and comparisons with other assemblages

Microconchid tubeworms from the Jurassic of England and France

Chaetopterid tubes from vent and seep sites: Implications for fossil record and evolutionary history of vent and seep annelids