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So far Grimur Grimsson has created 56 blog entries.

The first Loranthaceae fossils from Africa-2018

Authors:Friðgeir Grímsson,Alexandros Xafis, Frank H. Neumann, Louis Scott, Marion K. Bamford, Reinhard Zetter An ongoing re-investigation of the early Miocene Saldanha Bay (South Africa) palynoflora, using combined light andscanning electron microscopy (single grain method), is revealing several pollen types new to the African fossil record. One ofthe elements identified is Loranthaceae pollen. These grains represent [...]

By | February 22nd, 2019|Publications|0 Comments

Evolution of pollen morphology in Loranthaceae–2018

Authors: Friðgeir Grímsson, Guiod W. Grimm, Reinhard Zetter Earlier studies indicate a strong correlation of pollen morphology and ultrastructure with taxonomy in Loranthaceae. Using high-resolution light microscopy and scanning electron microscopy imaging of the same pollen grains, we document pollen types of 35 genera including 15 studied for the first time. Using a molecular phylogenetic [...]

By | February 21st, 2019|Publications|0 Comments

Pollen morphology of extant Winteraceae: a study allowing SEM-based affiliation of its fossil representatives –2017

Authors: Friðgeir Grímsson, Alexandros Xafis, Frank H. Neumann, Reinhard Zetter. When applying high-resolution microscopy, the pollen morphology of extant taxa can be used to classify fossil pollen, that is, to address the latter in the established systematic-phylogenetic framework. Here we investigate tetrads and pollen features of 20 different Winteraceae species, most of them belonging to [...]

By | February 11th, 2019|Publications|0 Comments

Bibionidae (Diptera) from the late Miocene of Hrútagil (Mókollsdalur), Iceland – 2017

Authors: John Skartveit, Friðgeir Grímsson, Torsten Wappler Here we describe fossil Bibionidae (Diptera) insects from the late Miocene Hrútagil locality (part of the 9–8 Ma Skarðsströnd–Mókollsdalur formation) in Iceland. This material offers a rare chance to study a fossil insect fauna from a North Atlantic oceanic island. The material includes three species, one from each [...]

By | July 1st, 2017|Publications|0 Comments

Tiny pollen grains: first evidence of Saururaceae from the Late Cretaceous of western North America – 2017

Authors: Friðgeir Grímsson, Guido W. Grimm, Reinhard Zetter Background. The Saururaceae, a very small family of Piperales comprising only six species in four genera, have a relatively scanty fossil record outside of Europe. The phylogenetic relationships of the four genera to each other are resolved, with the type genus Saururus occurring in both eastern North [...]

By | June 13th, 2017|Publications|0 Comments

Eocene Loranthaceae pollen pushes back divergence ages for major splits in the family – 2017

Authors: Friðgeir Grímsson, Paschalia Kapli, Christa-Charlotte Hofmann, Reinhard Zetter, Guido W. Grimm Background: We revisit the palaeopalynological record of Loranthaceae, using pollen ornamentation to discriminate lineages and to test molecular dating estimates for the diversification of major lineages. Methods: Fossil Loranthaceae pollen from the Eocene and Oligocene are analysed and documented using scanning-electron microscopy. These [...]

By | June 13th, 2017|Publications|0 Comments

Miocene palynofloras of the Tınaz lignite mine, Muğla, southwest Anatolia: Taxonomy, palaeoecology and local vegetation change – 2017

Authors: Johannes M. Bouchal, Serdar Mayda, Reinhard Zetter, Friðgeir Grímsson, Funda Akgün, Thomas Denk Middle Miocene deposits belonging to the Eskihisar Formation exposed at the Tınaz lignite mine, Yatağan Basin, Muğla, southwestern Turkey, were investigated palynologically. Nine spores, aplanospores/zygospores and cysts of fungi and algae, seven moss and fern spores, 12 gymnosperm pollen types, and [...]

By | April 14th, 2017|Publications|0 Comments

Taxonomy and palaeoecology of two widespread western Eurasian Neogene sclerophyllous oak species: Quercus drymeja Unger and Q. mediterranea Unger – 2017

Authors: Thomas Denk, Dimitrios Velitzelos, Tuncay H. Güner, Johannes M. Bouchal, Friðgeir Grímsson, Guido W. Grimm Sclerophyllous oaks (genus Quercus) play important roles in Neogene ecosystems of south-western Eurasia. Modern analogues (‘nearest living relatives’) for these oaks have been sought among five of six infrageneric lineages of Quercus, distributed across the entire Northern Hemisphere. A [...]

By | March 21st, 2017|Publications|0 Comments

Taxonomic description of in situ bee pollen from the middle Eocene of Germany – 2017

Authors: Friðgeir Grímsson, Reinhard Zetter, Conrad C. Labandeira, Michael S. Engel, Torsten Wappler The middle Eocene Messel and Eckfeld localities are renowned for their excellently preserved faunas and diverse floras. Here we describe for the first time pollen from insect-pollinated plants found in situ on well-preserved ancient bees using light and scanning electron microscopy. There [...]

By | January 18th, 2017|Publications|0 Comments

Cretaceous and Paleogene Fagaceae from North America and Greenland: evidence for a Late Cretaceous split between Fagus and the remaining Fagaceae -2016

Authors: Friðgeir Grímsson, Guido W. Grimm, Reinhard Zetter, Thomas Denk Modern lineages of the beech family, Fagaceae, one of the most important north-temperate families of woody flowering plants, have been traced back to the early Eocene. In contrast, molecular differentiation patterns indicate that the Fagus lineage, Fagoideae, with a single modern genus, evolved much earlier [...]

By | December 5th, 2016|Publications|0 Comments