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Daohugouthallus
''Daohugouthallus'' is a monotypic genus of lichen, known from fossils found in the Jurassic Haifanggou Formation near Daohugou village, Ningcheng County, China. The genus contains a single species, ''D. ciliiferus''. Although ''Daohugouthallus'' shows some relationships to the family Parmeliaceae, it is distinct enough for scientists to suggest its classification into its own family, Daohugouthallaceae. Dated at approximately 165 million years ago, this macrolichen is thought to be the earliest fossil example of an epiphytic macrolichen, indicating it likely grew on gymnosperm plants. Discovery Five specimens of ''Daohugouthallus ciliiferus'' have been found so far. These were collected from the fossiliferous beds of the Jurassic Haifanggou Formation in China (Callovian–Oxfordian boundary interval, Middle Jurassic), a formation which has been dated at between 168 and 152 Ma based on isotopic analyses. More specifically, the site of discovery can be found about 80 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
2022 In Paleontology
Flora Plants Fungi Newly named fungi Mycological research * A study on the anatomy of specimens of ''Prototaxites'' from the Heider quarry in Germany and the Bordeaux quarry in Canada is published by Vajda ''et al.'' (2022), who interpret specimens of ''Prototaxites'' as fungi and as rhizomorphs. * Yang ''et al.'' (2022) describe new fossil material of ''Daohugouthallus ciliiferus'' from the Jurassic Jiulongshan Formation (China), providing evidence that this macrolichen inhabited a gymnosperm branch, and name a new family Daohugouthallaceae placed within the class Lecanoromycetes. "Algae" Floral research * Sforna ''et al.'' (2022) report the discovery of bound nickel-tetrapyrrole Moiety (chemistry), moieties preserved within cells of a ~1-billion-years-old eukaryote ''Arctacellularia tetragonala'' from the BII Group of the Mbuji-Mayi Supergroup (Democratic Republic of the Congo), identify the tetrapyrrole moieties as chlorophyll derivatives, and interpret ''A. tetragonal ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Monotypic
In biology, a monotypic taxon is a taxonomic group (taxon) that contains only one immediately subordinate taxon. A monotypic species is one that does not include subspecies or smaller, infraspecific taxa. In the case of genera, the term "unispecific" or "monospecific" is sometimes preferred. In botanical nomenclature, a monotypic genus is a genus in the special case where a genus and a single species are simultaneously described. Theoretical implications Monotypic taxa present several important theoretical challenges in biological classification. One key issue is known as "Gregg's Paradox": if a single species is the only member of multiple hierarchical levels (for example, being the only species in its genus, which is the only genus in its family), then each level needs a distinct definition to maintain logical structure. Otherwise, the different taxonomic ranks become effectively identical, which creates problems for organizing biological diversity in a hierarchical syste ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
