Poraspididae Kiaer 1932

• Main Authors: Mark-Kurik, Elga, Blieck, Alain, Burrow, Carole J., Turner, Susan
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2013
• Subjects: Biodiversity; Taxonomy; Animalia; Chordata; Agnatha; Heterostraci; Poraspididae; Arctic; Chukotka; Spitsbergen
• Online Access: https://doi.org/10.5281/zenodo.5463523; http://treatment.plazi.org/id/493F87AAFF9462236B43FA00FD29FD3F

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