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 Lepidaspis ? sp. ( Fig. 6D ) MATERIAL. — Specimen GIT 580-2: isolated tessera. LOCALITY AND STRATIGRAPHIC HORIZON. — Same as specimens GIT 580-1, 3, 4, 6 and 7: locality (sample) 73, Tonnel’nyj Brook, south of De Long Strait, Chukotka ; Lower Member (1) of Enmakaj Formation, Lochkovian. DESCRIPTION ħe specimen is a diamond-shaped, 1.7 mm long tessera with a single central, narrow, elongate tubercle ( c. 1.4 mm long). ħis tubercle has denticulated edges. Each denticulation is simple (undivided). Additionally, on each side of this central tubercle occurs a much smaller narrow tubercle ( Fig. 6D ). ħe base of the tessera is perforated by small foramina of the underlying (probably reticulated) layer. ħis tessera compares well with those of Lepidaspis serrata Dineley & Loeffler (1976 : figs 74, 76, pl. 32: 6, 7), and especially with the tessera in their plate 32: 6, which bears a small lateral tubercle beside the main central denticulated one. However, because we have here a single tessera, it is difficult to compare with the great variability of shapes observed on Lepidaspis serrata tesserae ( Dineley & Loeffler 1976 ), and so only tentatively assign GIT 580-2 to Lepidaspis .