a new psammosteid (agnatha, heterostraci) from the amata regional stage of the main devonian field and morpho-histological types of discrete micromeric elements in the family psammosteidae

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ID: 222968
2017
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Abstract
In memory of an outstanding palaeoichthyologist Elga Mark-Kurik The range of diversity of psammosteids from the family Psammosteidae is still poorly known. Here a new species, Psammosteus ramosus sp. nov. Glinskiy, from the Amata Regional Stage of the Main Devonian Field is described. Its morphology, ornamentation, histology of exoskeletal plates, and micromeric elements are compared with those of other representatives of the family Psammosteidae. The comparison shows a close relationship of the new species with Psammosteus falcatus Obruchev, P. kiaeri Halstead Tarlo and P. pectinatus Obruchev, a group of species that is significantly different from other representatives of the genus Psammosteus and constitutes a separate evolutionary lineage. On the basis of morphological and histological features we here differentiate in the fields of tesserae of Psammosteidae the discrete micromeric elements of the ‘basic type’, known in Psammosteus bergi (Obruchev), P. levis Obruchev, P. livonicus Obruchev, P. maeandrinus Agassiz, P. megalopteryx (Trautschold), P. praecursor Obruchev and Karelosteus weberi Obruchev, and micromeric elements of the ‘progressive type’, known in Psammosteus falcatus, P. cf. kiaeri and P. ramosus sp. nov. Glinskiy.
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glinskiy2017estoniana Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Vadim N. Glinskiy;Sergey P. Nilov
Journal acta pharmaceutica
Year 2017
DOI
10.3176/earth.2017.05
URL
http://www.kirj.ee/public/Estonian_Journal_of_Earth_Sciences/2017/issue_2/earth-2017-2-59-76.pdf
Keywords
new species geology late devonian

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