Melvillipteris quadriseriata gen. et sp. nov., a new plant assigned to Rhacophytales from the Upper Devonian (Famennian) of Arctic Canada
Abstract A new plant of Late Devonian (Famennian) age, Melvillipteris quadriseriata gen. et sp. nov., is reported from Melville Island, Nunavut, Canadian Arctic Archipelago. Main axes and two orders of lateral branches are recognized. The main axes are monopodial in habit, with a zigzag and/or uprig...
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Online Access: | http://dx.doi.org/10.1017/s0016756815000746 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0016756815000746 |
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crcambridgeupr:10.1017/s0016756815000746 2024-03-03T08:40:13+00:00 Melvillipteris quadriseriata gen. et sp. nov., a new plant assigned to Rhacophytales from the Upper Devonian (Famennian) of Arctic Canada XUE, JIN-ZHUANG BASINGER, JAMES F. 2015 http://dx.doi.org/10.1017/s0016756815000746 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0016756815000746 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Geological Magazine volume 153, issue 4, page 601-617 ISSN 0016-7568 1469-5081 Geology journal-article 2015 crcambridgeupr https://doi.org/10.1017/s0016756815000746 2024-02-08T08:36:30Z Abstract A new plant of Late Devonian (Famennian) age, Melvillipteris quadriseriata gen. et sp. nov., is reported from Melville Island, Nunavut, Canadian Arctic Archipelago. Main axes and two orders of lateral branches are recognized. The main axes are monopodial in habit, with a zigzag and/or upright appearance and dense adventitious roots attached on some internodes. First-order branches are inserted on the main axes in distichous pairs, showing a quadriseriate pattern (i.e. alternate pairs); they bear one or two sterile ultimate appendages on the proximal portions, and then distally bear alternate second-order branches. Second-order branches bear alternate ultimate appendages which may be fertile or sterile; the sterile ultimate appendages are composed of one or two successive dichotomies, terminating in oppositely recurved tips, and fertile appendages show an elaborate branching system. Each fertile appendage has an initial dichotomy forming two sister branches, each of which further divides three or four times to produce ultimate divisions terminated by sporangia. Two to four small fusiform sporangia are grouped in a truss which is supplied by penultimate division of the fertile appendage. The sporangia have a pointed tip and a longitudinal dehiscence. This new plant resembles other plants with a quadriseriate branching pattern (e.g. Rhacophyton Crépin, Cephalopteris Nathorst, Protocephalopteris Ananiev, Ellesmeris Hill, Scheckler & Basinger and Protopteridophyton Li & Hsü), and is assigned to the Rhacophytales. Its similarity to and divergence from the rhacophytaleans, cladoxylopsids and other related plants are discussed. Article in Journal/Newspaper Arctic Archipelago Arctic Canadian Arctic Archipelago Nunavut Melville Island Cambridge University Press Arctic Nunavut Canadian Arctic Archipelago Canada Crépin ENVELOPE(-58.483,-58.483,-62.083,-62.083) Geological Magazine 153 4 601 617 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Geology |
spellingShingle |
Geology XUE, JIN-ZHUANG BASINGER, JAMES F. Melvillipteris quadriseriata gen. et sp. nov., a new plant assigned to Rhacophytales from the Upper Devonian (Famennian) of Arctic Canada |
topic_facet |
Geology |
description |
Abstract A new plant of Late Devonian (Famennian) age, Melvillipteris quadriseriata gen. et sp. nov., is reported from Melville Island, Nunavut, Canadian Arctic Archipelago. Main axes and two orders of lateral branches are recognized. The main axes are monopodial in habit, with a zigzag and/or upright appearance and dense adventitious roots attached on some internodes. First-order branches are inserted on the main axes in distichous pairs, showing a quadriseriate pattern (i.e. alternate pairs); they bear one or two sterile ultimate appendages on the proximal portions, and then distally bear alternate second-order branches. Second-order branches bear alternate ultimate appendages which may be fertile or sterile; the sterile ultimate appendages are composed of one or two successive dichotomies, terminating in oppositely recurved tips, and fertile appendages show an elaborate branching system. Each fertile appendage has an initial dichotomy forming two sister branches, each of which further divides three or four times to produce ultimate divisions terminated by sporangia. Two to four small fusiform sporangia are grouped in a truss which is supplied by penultimate division of the fertile appendage. The sporangia have a pointed tip and a longitudinal dehiscence. This new plant resembles other plants with a quadriseriate branching pattern (e.g. Rhacophyton Crépin, Cephalopteris Nathorst, Protocephalopteris Ananiev, Ellesmeris Hill, Scheckler & Basinger and Protopteridophyton Li & Hsü), and is assigned to the Rhacophytales. Its similarity to and divergence from the rhacophytaleans, cladoxylopsids and other related plants are discussed. |
format |
Article in Journal/Newspaper |
author |
XUE, JIN-ZHUANG BASINGER, JAMES F. |
author_facet |
XUE, JIN-ZHUANG BASINGER, JAMES F. |
author_sort |
XUE, JIN-ZHUANG |
title |
Melvillipteris quadriseriata gen. et sp. nov., a new plant assigned to Rhacophytales from the Upper Devonian (Famennian) of Arctic Canada |
title_short |
Melvillipteris quadriseriata gen. et sp. nov., a new plant assigned to Rhacophytales from the Upper Devonian (Famennian) of Arctic Canada |
title_full |
Melvillipteris quadriseriata gen. et sp. nov., a new plant assigned to Rhacophytales from the Upper Devonian (Famennian) of Arctic Canada |
title_fullStr |
Melvillipteris quadriseriata gen. et sp. nov., a new plant assigned to Rhacophytales from the Upper Devonian (Famennian) of Arctic Canada |
title_full_unstemmed |
Melvillipteris quadriseriata gen. et sp. nov., a new plant assigned to Rhacophytales from the Upper Devonian (Famennian) of Arctic Canada |
title_sort |
melvillipteris quadriseriata gen. et sp. nov., a new plant assigned to rhacophytales from the upper devonian (famennian) of arctic canada |
publisher |
Cambridge University Press (CUP) |
publishDate |
2015 |
url |
http://dx.doi.org/10.1017/s0016756815000746 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0016756815000746 |
long_lat |
ENVELOPE(-58.483,-58.483,-62.083,-62.083) |
geographic |
Arctic Nunavut Canadian Arctic Archipelago Canada Crépin |
geographic_facet |
Arctic Nunavut Canadian Arctic Archipelago Canada Crépin |
genre |
Arctic Archipelago Arctic Canadian Arctic Archipelago Nunavut Melville Island |
genre_facet |
Arctic Archipelago Arctic Canadian Arctic Archipelago Nunavut Melville Island |
op_source |
Geological Magazine volume 153, issue 4, page 601-617 ISSN 0016-7568 1469-5081 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0016756815000746 |
container_title |
Geological Magazine |
container_volume |
153 |
container_issue |
4 |
container_start_page |
601 |
op_container_end_page |
617 |
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1792495991750918144 |