Cardstonia tolmanii gen. et sp. nov. (Limnocharitaceae) from the Upper Cretaceous of Alberta, Canada.
Several new broad-leaved monocots were identified in gray siltstones and fine-grained sandstones from the Upper Cretaceous (Campanian-Maastrichtian) St. Mary River Formation near Cardston, Alberta, Canada. Specimens are compression/impressions of long-petiolate aquatic plants that were probably buri...
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ftunivalberta:oai:era.library.ualberta.ca:ebd5777f-be36-479e-9bab-0030ef6a0cb0 2023-05-15T17:05:20+02:00 Cardstonia tolmanii gen. et sp. nov. (Limnocharitaceae) from the Upper Cretaceous of Alberta, Canada. Riley, M.G. Stockey, R.A. 2004 https://era.library.ualberta.ca/items/ebd5777f-be36-479e-9bab-0030ef6a0cb0 https://doi.org/10.7939/R3Q23R99P English eng https://era.library.ualberta.ca/items/ebd5777f-be36-479e-9bab-0030ef6a0cb0 doi:10.7939/R3Q23R99P Copyright 2004 by The University of Chicago Monocot Aponogeton Alismatales Aquatic Echinodorus Haemanthophyllum Limnocharis Butomopsis Hydrocleys Cretaceous Article (Published) 2004 ftunivalberta https://doi.org/10.7939/R3Q23R99P 2022-08-22T20:14:42Z Several new broad-leaved monocots were identified in gray siltstones and fine-grained sandstones from the Upper Cretaceous (Campanian-Maastrichtian) St. Mary River Formation near Cardston, Alberta, Canada. Specimens are compression/impressions of long-petiolate aquatic plants that were probably buried in situ. Leaf blades are entire, ovate to elliptic, with deeply cordate bases; leaf blades are 5–12 cm long and 3.5–8.5 cm wide. Petioles are at least 4 mm wide with five to seven primary veins that enter the leaf blade. Venation is campylodromous, resulting in 23–27 primary veins with three medial veins that remain unbranched to the apex. Major and minor secondary veins (ABAB pattern) diverge at angles of 45°–65° near the midveins and 90° near the leaf margin. Tertiary veins are usually unbranched, but occasional dichotomies and anastomoses occur. No freely ending veinlets are visible. The Cardston specimens are compared with extant leaves of Alismatales and show closest similarities to those of Limnocharis L., Hydrocleys Rich., and Butomopsis Kunth. These leaves are also similar to fossil leaves of Haemanthophyllum Budantsev, in particular H. cordatum Golovneva from the Maastrichtian-Danian deposits of the Koryak Highlands, Russia. A reexamination of the genus Haemanthophyllum, the generitype (H. kamtschaticum Budantsev), the holotype for H. cordatum, and the Cardston specimens results in the description of a new genus, Cardstonia tolmanii gen. et sp. nov. (Limnocharitaceae). This study points to the need for reexamination of the remaining species in the genus Haemanthophyllum, which appear to represent a diverse assemblage of leaves of varying morphology that are probably not a natural group. Other/Unknown Material Koryak University of Alberta: Era - Education and Research Archive Canada |
institution |
Open Polar |
collection |
University of Alberta: Era - Education and Research Archive |
op_collection_id |
ftunivalberta |
language |
English |
topic |
Monocot Aponogeton Alismatales Aquatic Echinodorus Haemanthophyllum Limnocharis Butomopsis Hydrocleys Cretaceous |
spellingShingle |
Monocot Aponogeton Alismatales Aquatic Echinodorus Haemanthophyllum Limnocharis Butomopsis Hydrocleys Cretaceous Riley, M.G. Stockey, R.A. Cardstonia tolmanii gen. et sp. nov. (Limnocharitaceae) from the Upper Cretaceous of Alberta, Canada. |
topic_facet |
Monocot Aponogeton Alismatales Aquatic Echinodorus Haemanthophyllum Limnocharis Butomopsis Hydrocleys Cretaceous |
description |
Several new broad-leaved monocots were identified in gray siltstones and fine-grained sandstones from the Upper Cretaceous (Campanian-Maastrichtian) St. Mary River Formation near Cardston, Alberta, Canada. Specimens are compression/impressions of long-petiolate aquatic plants that were probably buried in situ. Leaf blades are entire, ovate to elliptic, with deeply cordate bases; leaf blades are 5–12 cm long and 3.5–8.5 cm wide. Petioles are at least 4 mm wide with five to seven primary veins that enter the leaf blade. Venation is campylodromous, resulting in 23–27 primary veins with three medial veins that remain unbranched to the apex. Major and minor secondary veins (ABAB pattern) diverge at angles of 45°–65° near the midveins and 90° near the leaf margin. Tertiary veins are usually unbranched, but occasional dichotomies and anastomoses occur. No freely ending veinlets are visible. The Cardston specimens are compared with extant leaves of Alismatales and show closest similarities to those of Limnocharis L., Hydrocleys Rich., and Butomopsis Kunth. These leaves are also similar to fossil leaves of Haemanthophyllum Budantsev, in particular H. cordatum Golovneva from the Maastrichtian-Danian deposits of the Koryak Highlands, Russia. A reexamination of the genus Haemanthophyllum, the generitype (H. kamtschaticum Budantsev), the holotype for H. cordatum, and the Cardston specimens results in the description of a new genus, Cardstonia tolmanii gen. et sp. nov. (Limnocharitaceae). This study points to the need for reexamination of the remaining species in the genus Haemanthophyllum, which appear to represent a diverse assemblage of leaves of varying morphology that are probably not a natural group. |
format |
Other/Unknown Material |
author |
Riley, M.G. Stockey, R.A. |
author_facet |
Riley, M.G. Stockey, R.A. |
author_sort |
Riley, M.G. |
title |
Cardstonia tolmanii gen. et sp. nov. (Limnocharitaceae) from the Upper Cretaceous of Alberta, Canada. |
title_short |
Cardstonia tolmanii gen. et sp. nov. (Limnocharitaceae) from the Upper Cretaceous of Alberta, Canada. |
title_full |
Cardstonia tolmanii gen. et sp. nov. (Limnocharitaceae) from the Upper Cretaceous of Alberta, Canada. |
title_fullStr |
Cardstonia tolmanii gen. et sp. nov. (Limnocharitaceae) from the Upper Cretaceous of Alberta, Canada. |
title_full_unstemmed |
Cardstonia tolmanii gen. et sp. nov. (Limnocharitaceae) from the Upper Cretaceous of Alberta, Canada. |
title_sort |
cardstonia tolmanii gen. et sp. nov. (limnocharitaceae) from the upper cretaceous of alberta, canada. |
publishDate |
2004 |
url |
https://era.library.ualberta.ca/items/ebd5777f-be36-479e-9bab-0030ef6a0cb0 https://doi.org/10.7939/R3Q23R99P |
geographic |
Canada |
geographic_facet |
Canada |
genre |
Koryak |
genre_facet |
Koryak |
op_relation |
https://era.library.ualberta.ca/items/ebd5777f-be36-479e-9bab-0030ef6a0cb0 doi:10.7939/R3Q23R99P |
op_rights |
Copyright 2004 by The University of Chicago |
op_doi |
https://doi.org/10.7939/R3Q23R99P |
_version_ |
1766059847861665792 |