The earliest annelids: Lower Cambrian polychaetes from the Sirius Passet Lagerstätte, Peary Land
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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ftciteseerx:oai:CiteSeerX.psu:10.1.1.473.4969 2023-05-15T16:28:16+02:00 The earliest annelids: Lower Cambrian polychaetes from the Sirius Passet Lagerstätte, Peary Land North Greenland Simon Conway Morris John S. Peel The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.473.4969 en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.473.4969 Metadata may be used without restrictions as long as the oai identifier remains attached to it. https://muzewol.pan.pl/archive/published/app53/app53-137.pdf Key words Annelida Polychaeta Phagmochaeta metazoan evolution Cambrian Sirius Passet Lagerstätte Greenland text ftciteseerx 2016-01-08T07:26:10Z 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. Text Greenland North Greenland Peary Land Unknown 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 |
Unknown |
op_collection_id |
ftciteseerx |
language |
English |
topic |
Key words Annelida Polychaeta Phagmochaeta metazoan evolution Cambrian Sirius Passet Lagerstätte Greenland |
spellingShingle |
Key words Annelida Polychaeta Phagmochaeta metazoan evolution Cambrian Sirius Passet Lagerstätte Greenland North Greenland Simon Conway Morris John S. Peel The earliest annelids: Lower Cambrian polychaetes from the Sirius Passet Lagerstätte, Peary Land |
topic_facet |
Key words Annelida Polychaeta Phagmochaeta metazoan evolution Cambrian Sirius Passet Lagerstätte Greenland |
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. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
North Greenland Simon Conway Morris John S. Peel |
author_facet |
North Greenland Simon Conway Morris John S. Peel |
author_sort |
North Greenland |
title |
The earliest annelids: Lower Cambrian polychaetes from the Sirius Passet Lagerstätte, Peary Land |
title_short |
The earliest annelids: Lower Cambrian polychaetes from the Sirius Passet Lagerstätte, Peary Land |
title_full |
The earliest annelids: Lower Cambrian polychaetes from the Sirius Passet Lagerstätte, Peary Land |
title_fullStr |
The earliest annelids: Lower Cambrian polychaetes from the Sirius Passet Lagerstätte, Peary Land |
title_full_unstemmed |
The earliest annelids: Lower Cambrian polychaetes from the Sirius Passet Lagerstätte, Peary Land |
title_sort |
earliest annelids: lower cambrian polychaetes from the sirius passet lagerstätte, peary land |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.473.4969 |
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_source |
https://muzewol.pan.pl/archive/published/app53/app53-137.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.473.4969 |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766017901270138880 |