Ornamentation of dermal bones of Placodermi from the Lower Devonian of Morocco as a measure of biodiversity

• Autorzy: Antczak M. , Berkowski B.

Identyfikatory

DOI

10.1515/logos-2017-0009

• Języki publikacji: EN

Abstrakty

EN

Dermal bones are formed early during growth and thus constitute an important tool in studies of ontogenetic and evolutionary changes amongst early vertebrates. Ornamentation of dermal bones of terrestrial vertebrates is often used as a taxonomic tool, for instance in Aetosauria, extant lungfishes (Dipnoi) and ray-finned fishes (Actinopterygii), for which it have been proved to be of use in differentiating specimens to species level. However, it has not been utilised to the same extent in placoderms. Several features of the ornamentation of Early Devonian placoderms from Hamar Laghdad (Morocco) were examined using both optical and scanning electron microscopy to determine whether it is possible to distinguish armoured Palaeozoic fishes. Four distinct morphotypes, based on ornamentation of dermal bones, are dif-ferentiated. These distinct types of ornamentation may be the result of either different location of dermal plates on the body or of ontogenetic (intraspecific) and/or interspecific variation.

Słowa kluczowe

EN

Arthrodira; interspecific variation; ontogeny; fishes; North Africa

PL

zróżnicowanie międzygatunkowe; ontogeneza; ryby; Afryka Północna

• Wydawca: Uniwersytet im. Adama Mickiewicza. Instytut Geologii
• Czasopismo: Geologos
• Rocznik: 2017
• Tom: Vol. 23, No. 2
• Strony: 65--73
• Opis fizyczny: Bibliogr. 45 poz.

Twórcy

autor

Antczak M.

• Adam Mickiewicz University, Faculty of Geographical and Geological Sciences, Institute of Geology, Department of Palaeontology and Stratigraphy, Krygowskiego 12, 61-680 Poznań, Poland

autor

Berkowski B.

• Adam Mickiewicz University, Faculty of Geographical and Geological Sciences, Institute of Geology, Department of Palaeontology and Stratigraphy, Krygowskiego 12, 61-680 Poznań, Poland

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Uwagi

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę (zadania 2017).