The fossil monocot Limnobiophyllum scutatum: Resolving the Phylogeny of Lemnaceae

Stockey, Ruth A.; Hoffman, Georgia L.; Rothwell, Gar W.

doi:10.2307/2446009

Cited by 95 publications

(48 citation statements)

References 42 publications

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“…The subfamilies in the classifications by Thanikaimoni (1969) and Grayum (1992), based on earlier systematic treatments, illogically emerged as eurypalynous. In addition, the treatment disagreed with the placement of Lemnaceae, hitherto considered to be closely related to Araceae, especially to Pistia L. (Aroideae) (Mayo et al 1997;Stockey et al 1997; see both also for reviews), based on morphological and embryological characters. In light of recent molecular data (Barabe et al 2002;Cabrera et al 2003) it seemed timely to conduct a comparative ultrastructural study of the pollen wall.…”

Section: Introductionmentioning

confidence: 83%

Pollen Wall Ultrastructure of Araceae and Lemnaceae in Relation to Molecular Classifications

Hesse¹

2006

aliso

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A comparative ultrastructural study of Araceae pollen walls was conducted for the first time. The results are based mainly on investigations by transmission electron microscopy of 101 species in 70 genera (out of a total of 105 genera), while pollen of 83 genera with 219 species were studied by scanning electron microscopy, generally without acetolysis. Special attention was given to Lemnaceae (including Limnobiophyllum) considered to be closely related to Araceae (especially to Pistia). The ultrastructural pollen wall characters are mostly in accordance with and strongly support the morphological classifications and the arrangement of genera within recent molecular trees. For example, pollen ultrastructural characters favor the placement of Lemnaceae (as Lemnoideae) between the two subfamilies Orontioideae and Pothoideae, and this novel view is strongly supported by molecular data. Within the large subfamily Aroideae, especially, the tribal arrangement based on molecular and morphological data is supported by palynological evidence with respect to the ektexine, which is mostly an unusual outer exine layer devoid of sporopollenin. In the morphologically basal tribes and in the corresponding "lower" clades of the molecular trees, a highly reduced or specifically modified smooth outer exine layer is typical. In contrast, a spiny outer exine layer is representative of the morphologically derived tribes, corresponding to the "higher" clades in the molecular trees.

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Section: Introductionmentioning

confidence: 83%

Pollen Wall Ultrastructure of Araceae and Lemnaceae in Relation to Molecular Classifications

Hesse¹

2006

aliso

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“…The extremely short, stocky stem, the single-developed, sessile, entire-margined, orbicular leaf, the campylodromous venation with 10 or 11 primary veins, the longitudinal elongated meshes of higher order veins, and the numerous simple adventitious roots of the specimen HUE-08091 (Fig. 4D, E) are features that definitively fall within the range of the genus diagnosis emended by Stockey et al (1997). The specimen HUE-07484 (Fig.…”

Section: Meso and Mega Plant Remainsmentioning

confidence: 67%

“…4). Among these are specimens that closely resemble the freshwater free-floating fossil Limnobiophyllum (Stockey et al, 1997). The extremely short, stocky stem, the single-developed, sessile, entire-margined, orbicular leaf, the campylodromous venation with 10 or 11 primary veins, the longitudinal elongated meshes of higher order veins, and the numerous simple adventitious roots of the specimen HUE-08091 (Fig.…”

Section: Meso and Mega Plant Remainsmentioning

confidence: 99%

“…4) is laterally compressed, and shows five leaves with fainter venation pattern. Due to the resemblance with living plants such as the freshwater Spirodela Schleiden, Kvaček (1995) and Stockey et al (1997) placed Limnobiophyllum in Lemnaceae within Arales. However, considering the most recent phylogeny, Limnobiophyllum must be now included in Lemnoideae of Araceae and within Alismatales.…”

Section: Meso and Mega Plant Remainsmentioning

confidence: 99%

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The biota of the Upper Cretaceous site of “Lo Hueco” (Cuenca, Spain)

Ortega¹,

Bardet

Barroso-Barcenilla

et al. 2015

Journal of Iberian Geology

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The Late Cretaceous (Campanian-Maastrichtian) fossil site of Lo Hueco was recently discovered close to the village of Fuentes (Cuenca, Spain) during the cutting of a little hill for installation of the railway of the Madrid-Levante high-speed train. To date, it has yielded a rich collection of well-preserved Cretaceous macrofossils, including plants, invertebrates, and vertebrates. The recovered fossil assemblage is mainly composed of plants, molluscs (bivalves and gastropods), actinopterygians and teleosteans fishes, amphibians, panpleurodiran (bothremydids) and pancryptodiran turtles, squamate lizards, eusuchian crocodyliforms, rhabdodontid ornithopods, theropods (mainly dromaeosaurids), and titanosaur sauropods. This assemblage was deposited in a near-coast continental muddy floodplain crossed by distributary sandy channels, exposed intermittently to brackish or marine and freshwater flooding as well as to partial or total desiccation events.

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“…Several filicalean ferns, including Woodwardia gravida, are present, and the common conifers include the cupressaceous genera Mesocyparis and Glyptostrobus while Fokienia and Elatocladus are present but uncommon. The most common type of fossil at this locality is the dicot leaves that were assigned to Dicotylophyllum anomalum by McIver & Basinger (1993 Stockey et al 1997).…”

Section: Williston Basinmentioning

confidence: 95%

Floristic composition and variation in late Paleocene to early Eocene floras in North America

Pigg¹,

DeVore²

2010

Bull. Geosci.

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The late Paleocene and early Eocene megafossil floras in North America are found primarily in the Williston, Green River, Powder River, Bighorn, and Alberta Basins of the northern Rocky Mountains and Western Interior. A few rare sites occur in the Mississippi Embayment of the Southeast. In contrast to the abrupt floristic changes seen at the K/T boundary, these floras document a gradual transition in species turnover, or, in the case of the Bighorn Basin, a long-term decrease in taxonomic diversity. This gradual transition is also in marked contrast to the rapid speciation among mammals of the early Eocene. Both preservation, and ability to place these floras within a temporal scale, determine how useful they are in assessing floristic changes across the Paleocene-Eocene transition. In some regions such as the Bighorn Basin of Wyoming precise stratigraphic control has allowed for documentation of paleoclimate change at a highly resolved temporal scale. At others, such as the Almont flora of the Williston Basin in North Dakota, exceptional preservation has provided the basis for describing individual taxa with the precision necessary to better understand their evolutionary and biogeographical histories. This study examines well-known plant taxa in the late Paleocene and early Eocene in the context of their depositional settings and temporal and spatial distribution. Integration of paleoecological and taxonomic studies is critical to understanding the evolutionary and depositional history of early Paleocene vegetation of North America

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The fossil monocot Limnobiophyllum scutatum: Resolving the Phylogeny of Lemnaceae

Cited by 95 publications

References 42 publications

Pollen Wall Ultrastructure of Araceae and Lemnaceae in Relation to Molecular Classifications

Pollen Wall Ultrastructure of Araceae and Lemnaceae in Relation to Molecular Classifications

The biota of the Upper Cretaceous site of “Lo Hueco” (Cuenca, Spain)

Floristic composition and variation in late Paleocene to early Eocene floras in North America

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