http://hdl.handle.net/20.500.12128/23537
Tytuł: | Morphologic variation of the Middle Devonian crinoid genus Haplocrinites from Poland |
Tytuł równoległy: | MicroCT tomography of the Middle Devonian crinoid genus Haplocrinites from Poland |
Autor: | Paszcza, Karolina Salamon, Mariusz A. Duda, Piotr Gorzelak, Przemysław |
Słowa kluczowe: | crinoids; Haplocrinites; Devonian; Holy Cross Mountains; Poland |
Data wydania: | sie-2022 |
Źródło: | Neues Jahrbuch fuer Geologie und Palaeontologie |
Abstrakt: | A rich collection of well-preserved Middle Devonian crinoid thecae from Holy Cross Mountains (Świętomarz locality, Poland) is described. They are attributed to the widely distributed inadunate crinoid genus Haplocrinites. Using a traditional classification these thecae should be assigned to two species (H. aremoricensis and H. boitardi). However, a wide range of morphologic variation suggests that this assemblage represents morphological variants of a single species. This is supported by morphometric analyses which revealed that these thecae are not clustered into two morphologically distinct groups. These data show that the number of haplocrinitid species is likely overestimated. Traditional classifications based on the cup shape and ornamentation are no longer tenable, and require substantial revision. The diagnosis of H. boitardi is emended to encompass a broader range of morphologic variation. H. aremoricensis is a junior synonym of H. boitardi. |
Opis: | A specimen of the Middle Devonian crinoid genus Haplocrinites (WNoZ/S/4/224/1) was scanned with microtomography to better visualize its internal and external morphology. The scan was performed in 2022 in the Faculty X-ray Microtomography Laboratory at the Faculty of Computer Science and Material Science, University of Silesia in Katowice, Chorzów, Poland, using the General Electric Phoenix v|tome|x micro-CT equipment at 160 kV, 70 μA and scanning time of 20 min. Projection images were captured using a 1,000×2,024 pxs scintillator/CCD with an exposure time of 250 ms and processed using Volume Graphics® VGSTUDIO Max software and analysed using Volume Graphics® myVGL viewer. |
URI: | http://hdl.handle.net/20.500.12128/23537 |
Pojawia się w kolekcji: | Artykuły (WNP) |
Plik | Opis | Rozmiar | Format | |
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LIL1a.avi | MicroCT tomography of haplocrinitid theca from Poland (specimen no. 1). | 8,7 MB | Unknown | Przejrzyj / Otwórz |
LIL1a.mp4 | MicroCT tomography of haplocrinitid theca from Poland (specimen no. 1). | 7,99 MB | Unknown | Przejrzyj / Otwórz |
LIL1b.avi | MicroCT tomography of haplocrinitid theca from Poland (specimen no. 1). | 8,66 MB | Unknown | Przejrzyj / Otwórz |
LIL1b.mp4 | MicroCT tomography of haplocrinitid theca from Poland (specimen no. 1). | 7,83 MB | Unknown | Przejrzyj / Otwórz |
LIL2a.avi | MicroCT tomography of haplocrinitid theca from Poland (specimen no. 2). | 8,74 MB | Unknown | Przejrzyj / Otwórz |
LIL2a.mp4 | MicroCT tomography of haplocrinitid theca from Poland (specimen no. 2). | 7,9 MB | Unknown | Przejrzyj / Otwórz |
LIL2b.avi | MicroCT tomography of haplocrinitid theca from Poland (specimen no. 2). | 8,73 MB | Unknown | Przejrzyj / Otwórz |
LIL2b.mp4 | MicroCT tomography of haplocrinitid theca from Poland (specimen no. 2). | 7,83 MB | Unknown | Przejrzyj / Otwórz |
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