Poraspididae Kiaer 1932

Poraspididae gen. et sp. indet. (Fig. 6G, H) MATERIAL. — Specimens GIT 580-4, 6 and 7 of the Institute of Geology, Tallinn University of Technology, Estonia: fragments of a flank scale (GIT 580-4) and of undetermined plates (GIT 580-6 and 7). LOCALITY AND STRATIGRAPHIC HORIZON. — Locality (sample) 7...

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Bibliographic Details
Main Authors: Mark-Kurik, Elga, Blieck, Alain, Burrow, Carole J., Turner, Susan
Format: Text
Language:unknown
Published: Zenodo 2013
Subjects:
Biodiversity
Taxonomy
Animalia
Chordata
Agnatha
Heterostraci
Poraspididae
Arctic
Red Bay
Chukotka
Spitsberg
Spitsbergen
Online Access:https://dx.doi.org/10.5281/zenodo.5463522
https://zenodo.org/record/5463522
Description
Summary:Poraspididae gen. et sp. indet. (Fig. 6G, H) MATERIAL. — Specimens GIT 580-4, 6 and 7 of the Institute of Geology, Tallinn University of Technology, Estonia: fragments of a flank scale (GIT 580-4) and of undetermined plates (GIT 580-6 and 7). LOCALITY AND STRATIGRAPHIC HORIZON. — Locality (sample) 73, Tonnel’nyj Brook, south of De Long Strait, Chukotka; Lower Member (1) of Enmakaj Formation, Lochkovian. DESCRIPTION ħis material is represented by three small fragmentary remains of dermal bony elements. ħe specimen GIT 580-4 (Fig. 6G) is from a flank scale of a poraspidid heterostracan similar to the scales figured, for example, by Blieck (1982: pl. VIII: 2, 4: Poraspis rostrata Kiaer &Heintz, 1935). It bears six flat dentine ridges per mm as in various Poraspis Kiaer,1930 species from the Lochkovian of Spitsbergen (Blieck& Heintz 1983: table 1). ħe specimen GIT 580-7 (Fig. 6H) has more vaulted (convex) and wider(2/mm) dentine ridges.It probably also comes from a poraspidid plate. : Published as part of Mark-Kurik, Elga, Blieck, Alain, Burrow, Carole J. & Turner, Susan, 2013, Early Devonian fishes from coastal De Long Strait, central Chukotka, Arctic Russia, pp. 545-578 in Geodiversitas 35 (3) on pages 555-556, DOI: 10.5252/g2013n3a3, http://zenodo.org/record/5372262 : {"references": ["BLIECK A. 1982. - Les Heterostraces (Vertebres Agnathes) de l'horizon Vogti (Groupe de Red Bay, Devonien inferieur du Spitsberg). Cahiers de Paleontologie, Paris, CNRS edit., 51 p. [in French, with English abstract]", "BLIECK A. & HEINTZ N. 1983. - he Cyathaspids of the Red Bay Group (Lower Devonian) of Spitsbergen. (he Downtonian and Devonian vertebrates of Spitsbergen. XIV) Polar Research 1, n. s. (1): 49 - 74."]}

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