ERA

Download the full-sized PDF of The Aquatic Angiosperm Trapago angulata from the Upper Cretaceous (Maastrichtian) St. Mary River Formation of Southern Alberta.Download the full-sized PDF

Analytics

Share

Permanent link (DOI): https://doi.org/10.7939/R3FJ29Q1S

Download

Export to: EndNote  |  Zotero  |  Mendeley

Communities

This file is in the following communities:

Biological Sciences, Department of

Collections

This file is in the following collections:

Journal Articles (Biological Sciences)

The Aquatic Angiosperm Trapago angulata from the Upper Cretaceous (Maastrichtian) St. Mary River Formation of Southern Alberta. Open Access

Descriptions

Author or creator
Stockey, R.A.
Rothwell, G.W.
Additional contributors
Subject/Keyword
Canada
St. Mary River Formation
Trapago angulata
Type of item
Journal Article (Published)
Language
English
Place
Time
Description
A floating aquatic dicot with leaves assignable to Trapago angulata has been characterized from Upper Cretaceous (Maastrichtian) deposits of the St. Mary River Formation in southern Alberta, Canada. Reconstruction of the plant is based on nearly 500 specimens of various isolated and attached organs. Prominent floating rosettes of leaves were interconnected by submerged horizontal rhizomes with a distinct, crenulate surface and formed dense mats at the surfaces of small freshwater ponds. At least eight different leaf morphologies were produced. Rosettes bore opposite pairs of simple leaves and compound leaves with three, five, seven, nine, and possibly 11 leaflets. Highly dissected, submerged leaves of differing morphologies occur on rosette-bearing axes and rhizomes. Paired bud scales at the nodes of the crenulate rhizomes subtend both rhizome leaves and elongate, branched roots. Solitary flowers on long pedicels are attached in the axils of compound leaves. These remains are compared to those described as Quereuxia angulata (Newberry) Kryshtofovich from Russia, and extant Trapa L. Specimens from Russia, while showing leaves of mor- phology similar to that of T. angulata, differ in growth and branching pattern, supporting the interpretation that they are indeed different genera. Although Trapago has commonly been placed in the Trapaceae, the similarities between extant Trapa and Trapago could be attributed to convergence, and the familial affinities of the fossil remain uncertain.
Date created
1997
DOI
doi:10.7939/R3FJ29Q1S
License information
Rights
Copyright 1997 by The University of Chicago
Citation for previous publication
Stockey, R.A., and Rothwell, G.W. (1997). The Aquatic Angiosperm Trapago angulata from the Upper Cretaceous (Maastrichtian) St. Mary River Formation of Southern Alberta. International Journal of Plant Sciences , Vol. 158, No. 1, 83-94
Source
Link to related item

File Details

Date Uploaded
Date Modified
2014-04-28T22:53:44.818+00:00
Audit Status
Audits have not yet been run on this file.
Characterization
File format: pdf (Portable Document Format)
Mime type: application/pdf
File size: 5209498
Last modified: 2015:10:12 18:52:41-06:00
Filename: IJOPS_158_1997_83.pdf
Original checksum: 567183d045df7afbff029a1d0a1c864e
Well formed: false
Valid: false
Status message: Invalid object number or object stream offset=2754
File title: The Aquatic Angiosperm Trapago angulata from the Upper Cretaceous (Maastrichtian) St. Mary River Formation of Southern Alberta
File language: en
Activity of users you follow
User Activity Date