Morphological variation in Hemigordius harltoni Cushman & Waters, 1928: Remarks on the taxonomy of Carboniferous and Permian hemigordiopsids

Date

2003-06-01

Author

Altıner, Demir
Ozkan-Altiner, S

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

161
views

0
downloads

Nine morphotypes recognized within its population suggest that Hemigordius harltoni is a polytypic species. Narrowly discoidal to discoidal morphotypes are dominant in the population whereas lenticular ones are rare and sporadic. The degree of morphological variation in H. harltoni prompts us to question the validity of several previously named Carboniferous and Permian taxa. The definition of these taxa, generally based on few specimens, is far from being satisfactory to describe the intraspecific variability. Some named species are actually morphotypes belonging to highly variable species.

Subject Keywords

Hemigordius harltoni, Taxonomy, Polytypic species, Morphotype, Carboniferous, Permian

URI

https://hdl.handle.net/11511/34824

Journal

RIVISTA ITALIANA DI PALEONTOLOGIA E STRATIGRAFIA

DOI

https://doi.org/10.3732/ajb.1500330

Collections

Department of Geological Engineering, Article

Suggestions

OpenMETU
Core

Systematics of West African Miniopterus with the description of a new species Monadjem, Ara; Shapiro, Julie T.; Richards, Leigh R.; Karabulut, Hatice; Crawley, Wing; Nielsen, Ida Broman; Hansen, Anders; Bohmann, Kristine; Mourier, Tobias (2019-12-01) The phylogenetic relationships and species limits within the chiropteran family Miniopteridae are poorly known in mainland Africa. Recent systematic studies in Madagascar have shown that this is a species-rich family, yet only eight species are currently recognized or hypothesized for continental Africa. Based on partial cytochrome b sequences and morphometric analysis, we describe a new species of Miniopterus that is endemic to a restricted, montane region of Liberia and Guinea. Furthermore, the taxonomic ...
Phylogenetic analysis of the Turkish Salix species based on sequence data from chloroplast matK and nuclear ITS regions Acar, Pelin; Özdemir Değirmenci, Funda; Kaya, Zeki (null; 2016-01-13) The genus Salix L. is represented by more than 500 species in the world. About 28 species of these are naturally found in Turkey. This genus has been commonly used as biomass production for energy, phytoremediation and pharmacological products. The traditional methods for identifying the species based on morphology are insufficient to classify them due to hybridization, reproductive isolation, and polyploidy. The objective of this study was to reveal the phylogenetic relationships of native willow species i...
Current status of Great Bustard Otis tarda in Turkey: population size, distribution, movements, and threats Akarsu, FERDI·; Özgencil, İbrahim Kaan; Gürsoy Ergen, Arzu ; Saygılı-Yiğit, Fulya ; Karakaya, Muharrem; Soyluer, Melisa; Soyluer, MELÄ°SA (2021-01-01) The Great Bustard Otis tarda is a globally threatened species with populations inhabiting the steppe zones of Turkey. In recent decades, its populations in Turkey have suffered severe declines in range and size. Although the remaining populations are in urgent need of protection, there has been no national-scale study on the species since 2009, and huge information gaps remain concerning its range, abundance, and movements in the country. Here, we combined data from five years of fieldwork together with all...
Leaf micromorphology of the family Plumbaginaceae in Turkey Sayar, İpek; Doğan, Musa; Department of Biology (2022-9-2) Turkey is located in the region where the species belonging to the Plumbaginaceae family mostly spread and it also hosts important endemic species. This study aimed to carry out the leaf micromorphological characteristics of the species belonging to the Plumbaginaceae family collected from Turkey. In this study, the surface micromorphology of the dried leaf samples of 9 Limonium, 3 Acantholimon, 2 Armeria and 1 Plumbago species were collected by different researchers from all over Turkey and kept at the Pla...
Genetic Diversity Pattern of Salix alba Populations in a Fragmented River Ecosystem in Eastern Mediterranean Özdemir Değirmenci, Funda; Acar, Pelin; Kaya, Zeki (null; 2016-01-13) The genus Salix L. is represented with more than 500 species in the world and 28 of species are found naturally in Turkey. The species of the genus have been widely used for bioenergy and phytoremediation. Salix alba like many other willow species is with great renewable energy potentiali and important component of an healthy riparian ecosystem as an indicator species in major river ecosystems in Turkey. With this study, it was aimed to provide information for efficient conservation, management and util...

Citation Formats

D. Altıner and S. Ozkan-Altiner, “Morphological variation in Hemigordius harltoni Cushman & Waters, 1928: Remarks on the taxonomy of Carboniferous and Permian hemigordiopsids,” RIVISTA ITALIANA DI PALEONTOLOGIA E STRATIGRAFIA, pp. 195–211, 2003, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/34824.