The earliest annelids: Lower Cambrian polychaetes from the Sirius Passet Lagerstätte, Peary Land, North Greenland
Apart from the Phyllopod Bed of the Burgess Shale (Middle Cambrian) polychaete annelids are practically unknown from any of the Cambrian Lagerstätten. This is surprising both because their diversity in the Burgess Shale is considerable, while to date the Chengjiang Lagerstätte which is equally impre...
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ftucambridgeesc:oai:eprints.esc.cam.ac.uk:926 2023-05-15T16:28:05+02:00 The earliest annelids: Lower Cambrian polychaetes from the Sirius Passet Lagerstätte, Peary Land, North Greenland Conway Morris, S. Peel, J. S. 2008 application/pdf http://eprints.esc.cam.ac.uk/926/ http://eprints.esc.cam.ac.uk/926/1/Conway_Morris_Acta_Pal_Polonica_53_1_2008.pdf http://www.app.pan.pl/archive/published/app53/app53-137.pdf en eng http://eprints.esc.cam.ac.uk/926/1/Conway_Morris_Acta_Pal_Polonica_53_1_2008.pdf Conway Morris, S. and Peel, J. S. (2008) The earliest annelids: Lower Cambrian polychaetes from the Sirius Passet Lagerstätte, Peary Land, North Greenland. Acta Palaeontologica Polonica, 53 (1). pp. 137-148. 04 - Palaeobiology Article PeerReviewed 2008 ftucambridgeesc 2020-08-27T18:08:43Z Apart from the Phyllopod Bed of the Burgess Shale (Middle Cambrian) polychaete annelids are practically unknown from any of the Cambrian Lagerstätten. This is surprising both because their diversity in the Burgess Shale is considerable, while to date the Chengjiang Lagerstätte which is equally impressive in terms of faunal diversity has no reliable records of any annelids. Here we describe, on the basis of about 40 specimens, Phragmochaeta canicularis gen. et sp. nov. from the Lower Cambrian Sirius Passet Lagerstätte of Peary Land, North Greenland. This makes it by far the oldest known polychaete, with a likely age of lower to middle Atdabanian, The body consists of approximately 20 segments, each bearing notochaetae and neurochaetae. The former appeared to have formed a felt-like covering on the dorsum, whilst the neurochaetae projected obliquely to the longitudinal axis. Apart from minor differences in chaetal size at either end there is no other tagmosis. Details of the head are obscure, and presence of palps, tentacles and eyes are conjectural. Jaws appear to have been absent. The gut was straight, and flanked by massive longitudinal musculature. P. canicularis was evidently benthic, propelling itself on the neurochaetae, with the dorsal neurochaetae conferring protection. Its stratigraphic position and generalized appearance are consistent with P. canicularis being primitive, but the phylogenetic relationships within the polychaetes remain problematic, principally because of paucity of relevant morphological information. Article in Journal/Newspaper Greenland North Greenland Peary Land University of Cambridge, Department of Earth Sciences: ESC Publications Burgess ENVELOPE(76.128,76.128,-69.415,-69.415) Greenland Peary ENVELOPE(-63.867,-63.867,-65.250,-65.250) Peary Land ENVELOPE(-32.500,-32.500,82.633,82.633) Sirius ENVELOPE(163.250,163.250,-84.133,-84.133) |
institution |
Open Polar |
collection |
University of Cambridge, Department of Earth Sciences: ESC Publications |
op_collection_id |
ftucambridgeesc |
language |
English |
topic |
04 - Palaeobiology |
spellingShingle |
04 - Palaeobiology Conway Morris, S. Peel, J. S. The earliest annelids: Lower Cambrian polychaetes from the Sirius Passet Lagerstätte, Peary Land, North Greenland |
topic_facet |
04 - Palaeobiology |
description |
Apart from the Phyllopod Bed of the Burgess Shale (Middle Cambrian) polychaete annelids are practically unknown from any of the Cambrian Lagerstätten. This is surprising both because their diversity in the Burgess Shale is considerable, while to date the Chengjiang Lagerstätte which is equally impressive in terms of faunal diversity has no reliable records of any annelids. Here we describe, on the basis of about 40 specimens, Phragmochaeta canicularis gen. et sp. nov. from the Lower Cambrian Sirius Passet Lagerstätte of Peary Land, North Greenland. This makes it by far the oldest known polychaete, with a likely age of lower to middle Atdabanian, The body consists of approximately 20 segments, each bearing notochaetae and neurochaetae. The former appeared to have formed a felt-like covering on the dorsum, whilst the neurochaetae projected obliquely to the longitudinal axis. Apart from minor differences in chaetal size at either end there is no other tagmosis. Details of the head are obscure, and presence of palps, tentacles and eyes are conjectural. Jaws appear to have been absent. The gut was straight, and flanked by massive longitudinal musculature. P. canicularis was evidently benthic, propelling itself on the neurochaetae, with the dorsal neurochaetae conferring protection. Its stratigraphic position and generalized appearance are consistent with P. canicularis being primitive, but the phylogenetic relationships within the polychaetes remain problematic, principally because of paucity of relevant morphological information. |
format |
Article in Journal/Newspaper |
author |
Conway Morris, S. Peel, J. S. |
author_facet |
Conway Morris, S. Peel, J. S. |
author_sort |
Conway Morris, S. |
title |
The earliest annelids: Lower Cambrian polychaetes from the Sirius Passet Lagerstätte, Peary Land, North Greenland |
title_short |
The earliest annelids: Lower Cambrian polychaetes from the Sirius Passet Lagerstätte, Peary Land, North Greenland |
title_full |
The earliest annelids: Lower Cambrian polychaetes from the Sirius Passet Lagerstätte, Peary Land, North Greenland |
title_fullStr |
The earliest annelids: Lower Cambrian polychaetes from the Sirius Passet Lagerstätte, Peary Land, North Greenland |
title_full_unstemmed |
The earliest annelids: Lower Cambrian polychaetes from the Sirius Passet Lagerstätte, Peary Land, North Greenland |
title_sort |
earliest annelids: lower cambrian polychaetes from the sirius passet lagerstätte, peary land, north greenland |
publishDate |
2008 |
url |
http://eprints.esc.cam.ac.uk/926/ http://eprints.esc.cam.ac.uk/926/1/Conway_Morris_Acta_Pal_Polonica_53_1_2008.pdf http://www.app.pan.pl/archive/published/app53/app53-137.pdf |
long_lat |
ENVELOPE(76.128,76.128,-69.415,-69.415) ENVELOPE(-63.867,-63.867,-65.250,-65.250) ENVELOPE(-32.500,-32.500,82.633,82.633) ENVELOPE(163.250,163.250,-84.133,-84.133) |
geographic |
Burgess Greenland Peary Peary Land Sirius |
geographic_facet |
Burgess Greenland Peary Peary Land Sirius |
genre |
Greenland North Greenland Peary Land |
genre_facet |
Greenland North Greenland Peary Land |
op_relation |
http://eprints.esc.cam.ac.uk/926/1/Conway_Morris_Acta_Pal_Polonica_53_1_2008.pdf Conway Morris, S. and Peel, J. S. (2008) The earliest annelids: Lower Cambrian polychaetes from the Sirius Passet Lagerstätte, Peary Land, North Greenland. Acta Palaeontologica Polonica, 53 (1). pp. 137-148. |
_version_ |
1766017717896216576 |