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Early cretaceous monocots: a phylogenetic evaluation


Doyle, J A; Endress, P K; Upchurch, G R (2008). Early cretaceous monocots: a phylogenetic evaluation. Sborník Národního musea v Praze. B, P?írodov?dný = Acta Musei Nationalis Pragae. B, Historia naturalis, 64(2-4):61-87.

Abstract

Reports of Early Cretaceous monocots have been questioned as being based on invalid systematic criteria and not supported by phylogenetic analyses. Our analyses, using a morphological data set for basal angiosperms and assuming relationships among living taxa derived from morphological and molecular data, support a monocot affinity for Liliacidites, i.e., boat-shaped monosulcate pollen with graded sculpture that becomes finer at the ends of the grain. However, pollen with finer sculpture at the poles, originally assigned to Liliacidites but segregated as Similipollis, has been associated with floral parts called Anacostia, which our analysis places in Austrobaileyales. Pollen identified as “Liliacidites” minutus was produced by Virginianthus, near the base of Laurales. Masses of striate pollen called Mayoa share unique derived characters with some Araceae, but the coarsely reticulate pollen genus Pennipollis and associated floral remains, also compared
with Alismatales, are more likely related to Chloranthaceae (with or without Ceratophyllum). Addition of caciaephyllum, a shoot bearing leaves with apically fused major venation, to a seed plant data set supports a relationship with monocots rather than superficially similar living and fossil Gnetales. Late Albian-early Cenomanian leaf fragments from Australia have derived features supportive of a relationship to monocots.

Reports of Early Cretaceous monocots have been questioned as being based on invalid systematic criteria and not supported by phylogenetic analyses. Our analyses, using a morphological data set for basal angiosperms and assuming relationships among living taxa derived from morphological and molecular data, support a monocot affinity for Liliacidites, i.e., boat-shaped monosulcate pollen with graded sculpture that becomes finer at the ends of the grain. However, pollen with finer sculpture at the poles, originally assigned to Liliacidites but segregated as Similipollis, has been associated with floral parts called Anacostia, which our analysis places in Austrobaileyales. Pollen identified as “Liliacidites” minutus was produced by Virginianthus, near the base of Laurales. Masses of striate pollen called Mayoa share unique derived characters with some Araceae, but the coarsely reticulate pollen genus Pennipollis and associated floral remains, also compared
with Alismatales, are more likely related to Chloranthaceae (with or without Ceratophyllum). Addition of caciaephyllum, a shoot bearing leaves with apically fused major venation, to a seed plant data set supports a relationship with monocots rather than superficially similar living and fossil Gnetales. Late Albian-early Cenomanian leaf fragments from Australia have derived features supportive of a relationship to monocots.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute of Systematic Botany and Botanical Gardens
Dewey Decimal Classification:580 Plants (Botany)
Language:English
Date:2008
Deposited On:27 Jan 2009 20:35
Last Modified:05 Apr 2016 12:54
Publisher:Národní muzeum
ISSN:0036-5343
Related URLs:http://www.nm.cz/old/casopisy/serieb/index.htm (Publisher)
Permanent URL: http://doi.org/10.5167/uzh-11654

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