New data on Osteostracans (Agnatha) from the Lower Devonian of the Severnaya Zemlya Archipelago

The osteostracans Reticulaspis menneri gen. et sp. nov. and Nucleaspis unica gen. et sp. nov. from the Lower Devonian Severnaya Zemlya Formation of October Revolution Island of the Severnaya Zemlya Archipelago are described. The perfect preservation of the exoskeleton structure of Reticulaspis menne...

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Bibliographic Details
Published in:Paleontological Journal
Main Authors: Afanassieva, Olga B., Karatajūtė-Talimaa, Valentina
Format: Article in Journal/Newspaper
Language:English
Published: 2014
Subjects:
Agnatha
Osteostracans
Morphology
Taxonomy
Lower Devonian
Severnaya Zemlya Archipelago
Severnaya Zemlya
October Revolution Island
Online Access:http://lmavb.lvb.lt/LMAVB:ELABAPDB6229219&prefLang=en_US
Description
Summary:The osteostracans Reticulaspis menneri gen. et sp. nov. and Nucleaspis unica gen. et sp. nov. from the Lower Devonian Severnaya Zemlya Formation of October Revolution Island of the Severnaya Zemlya Archipelago are described. The perfect preservation of the exoskeleton structure of Reticulaspis menneri allows the design and growth mode of the exoskeleton, with a continuous reticular dental surface of the cephalothoracic shield to be characterized. Nucleaspis unica is represented by a juvenile stage, which is extremely scarce in this vertebrate group. The preoccupied generic name Ungulaspis Afanassieva et Karatajūtė-Talimaa, 1998 is replaced by Paraungulaspis

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