Reconstructing a complex early Neoproterozoic eukaryote, Wynniatt Formation, Victoria Island, arctic Canada
Flanged filamentous microfossils from two geographically separated assemblages in the early Neoproterozoic Wynniatt Formation, arctic Canada, co-occur with flanged Clavitrichoides -type filaments, flanged Osculosphaera-type vesicles and wrinkled, bi-layered vesicles assigned to a new acritarch form-...
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ftucambridgeesc:oai:eprints.esc.cam.ac.uk:1592 2023-05-15T14:24:26+02:00 Reconstructing a complex early Neoproterozoic eukaryote, Wynniatt Formation, Victoria Island, arctic Canada Butterfield, N. J. 2005-01 application/pdf http://eprints.esc.cam.ac.uk/1592/ http://eprints.esc.cam.ac.uk/1592/1/Butterfield_NJ_Lethaia_38,2_%282005%29.pdf https://doi.org/10.1080/00241160510013231 en eng http://eprints.esc.cam.ac.uk/1592/1/Butterfield_NJ_Lethaia_38,2_%282005%29.pdf Butterfield, N. J. (2005) Reconstructing a complex early Neoproterozoic eukaryote, Wynniatt Formation, Victoria Island, arctic Canada. Lethaia, 38 (2). pp. 155-169. DOI https://doi.org/10.1080/00241160510013231 <https://doi.org/10.1080/00241160510013231> 04 - Palaeobiology Article PeerReviewed 2005 ftucambridgeesc https://doi.org/10.1080/00241160510013231 2020-08-27T18:08:55Z Flanged filamentous microfossils from two geographically separated assemblages in the early Neoproterozoic Wynniatt Formation, arctic Canada, co-occur with flanged Clavitrichoides -type filaments, flanged Osculosphaera-type vesicles and wrinkled, bi-layered vesicles assigned to a new acritarch form-taxon Plicatosphaeridium impostor n. gen., n. sp. Marked similarities in morphological and microstructural detail identify most, if not all, of these forms as components of a single, relatively complex, multicellular eukaryote, Cheilofilum hysteriopsis n. gen., n. sp. The filamentous, occasionally branched thallus was composed of large cylindrical cells, and extended via rupture of cell termini. Filaments originated from Clavitrichoides -type or Osculosphaera -type vesicles via a similar process of rupture, flange formation and apical extension. Presence of a distinctively mottled wall texture supports the ontogenetic relationship of Wynniatt Cheilofilum, 'Clavitrichoides' and 'Osculosphaera,' and provides circumstantial evidence for including a Plicatosphaeridium phase. Despite superficial similarities, Cheilofilum cannot be interpreted as a filamentous cyanobacterium, strobilating scyphozoan or polychaete worm tube. The distinctive cytokinesis of the filamentous component has close analogues among the annellophores and/or phialides (conidiophores) of various hyphomycetous fungi, though its large size and absence of an associated mycelium argue against its placement within the Fungi. Unambiguous fungal synapomorphies are expressed in co-occurring Tappania, however, and both Cheilofilum and Tappania include a closely comparable Clavitrichoides -type phase in their life cycle. Article in Journal/Newspaper Arctic Arctic Victoria Island victoria island University of Cambridge, Department of Earth Sciences: ESC Publications Arctic Canada Lethaia 38 2 155 169 |
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 Butterfield, N. J. Reconstructing a complex early Neoproterozoic eukaryote, Wynniatt Formation, Victoria Island, arctic Canada |
topic_facet |
04 - Palaeobiology |
description |
Flanged filamentous microfossils from two geographically separated assemblages in the early Neoproterozoic Wynniatt Formation, arctic Canada, co-occur with flanged Clavitrichoides -type filaments, flanged Osculosphaera-type vesicles and wrinkled, bi-layered vesicles assigned to a new acritarch form-taxon Plicatosphaeridium impostor n. gen., n. sp. Marked similarities in morphological and microstructural detail identify most, if not all, of these forms as components of a single, relatively complex, multicellular eukaryote, Cheilofilum hysteriopsis n. gen., n. sp. The filamentous, occasionally branched thallus was composed of large cylindrical cells, and extended via rupture of cell termini. Filaments originated from Clavitrichoides -type or Osculosphaera -type vesicles via a similar process of rupture, flange formation and apical extension. Presence of a distinctively mottled wall texture supports the ontogenetic relationship of Wynniatt Cheilofilum, 'Clavitrichoides' and 'Osculosphaera,' and provides circumstantial evidence for including a Plicatosphaeridium phase. Despite superficial similarities, Cheilofilum cannot be interpreted as a filamentous cyanobacterium, strobilating scyphozoan or polychaete worm tube. The distinctive cytokinesis of the filamentous component has close analogues among the annellophores and/or phialides (conidiophores) of various hyphomycetous fungi, though its large size and absence of an associated mycelium argue against its placement within the Fungi. Unambiguous fungal synapomorphies are expressed in co-occurring Tappania, however, and both Cheilofilum and Tappania include a closely comparable Clavitrichoides -type phase in their life cycle. |
format |
Article in Journal/Newspaper |
author |
Butterfield, N. J. |
author_facet |
Butterfield, N. J. |
author_sort |
Butterfield, N. J. |
title |
Reconstructing a complex early Neoproterozoic eukaryote, Wynniatt Formation, Victoria Island, arctic Canada |
title_short |
Reconstructing a complex early Neoproterozoic eukaryote, Wynniatt Formation, Victoria Island, arctic Canada |
title_full |
Reconstructing a complex early Neoproterozoic eukaryote, Wynniatt Formation, Victoria Island, arctic Canada |
title_fullStr |
Reconstructing a complex early Neoproterozoic eukaryote, Wynniatt Formation, Victoria Island, arctic Canada |
title_full_unstemmed |
Reconstructing a complex early Neoproterozoic eukaryote, Wynniatt Formation, Victoria Island, arctic Canada |
title_sort |
reconstructing a complex early neoproterozoic eukaryote, wynniatt formation, victoria island, arctic canada |
publishDate |
2005 |
url |
http://eprints.esc.cam.ac.uk/1592/ http://eprints.esc.cam.ac.uk/1592/1/Butterfield_NJ_Lethaia_38,2_%282005%29.pdf https://doi.org/10.1080/00241160510013231 |
geographic |
Arctic Canada |
geographic_facet |
Arctic Canada |
genre |
Arctic Arctic Victoria Island victoria island |
genre_facet |
Arctic Arctic Victoria Island victoria island |
op_relation |
http://eprints.esc.cam.ac.uk/1592/1/Butterfield_NJ_Lethaia_38,2_%282005%29.pdf Butterfield, N. J. (2005) Reconstructing a complex early Neoproterozoic eukaryote, Wynniatt Formation, Victoria Island, arctic Canada. Lethaia, 38 (2). pp. 155-169. DOI https://doi.org/10.1080/00241160510013231 <https://doi.org/10.1080/00241160510013231> |
op_doi |
https://doi.org/10.1080/00241160510013231 |
container_title |
Lethaia |
container_volume |
38 |
container_issue |
2 |
container_start_page |
155 |
op_container_end_page |
169 |
_version_ |
1766296846260502528 |