Early Devonian fishes from coastal De Long Strait, central Chukotka, Arctic Russia Author Mark-Kurik, Elga Author Blieck, Alain Author Burrow, Carole J. Author Turner, Susan text Geodiversitas 2013 2013-09-27 35 3 545 578 http://dx.doi.org/10.5252/g2013n3a3 journal article 10.5252/g2013n3a3 1638-9395 5372262 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.