Isadia aristoviensis Minikh, 1990

Pindakiewicz, Maciej, Tałanda, Mateusz, Sulej, Tomasz, Niedźwiedzki, Grzegorz, Sennikov, Andrey G., Bakaev, Alexandr S., Bulanov, Valeriy V., Golubev, Valeriy K. & Minikh, Alla V., 2020, Feeding convergence among ray-finned fishes: Teeth of the herbivorous actinopterygians from the latest Permian of East European Platform, Russia, Acta Palaeontologica Polonica 65 (1), pp. 71-79 : 74

Isadia aristoviensis Minikh, 1990

Fig. 2A–I .

Material. — Isolated teeth ( ZPAL V.51/1–9) and 208 unnumbered teeth: 124 maxillary and 84 mandibular from Sokovka outcrop, Vyazniki in Vladimir Region, Russia, late Permian Upper Vyatkian).

Description.—The maxillary teeth have 3 cusplets of the crown with acrodine. The crown is flat and labially convex and lingually concave. The internal canal starts at the beginning of the root and ends in the base of crown. Morphotypes differ in size, length of base and shape of crown. The smaller morphotype is more straight, has short base and has slightly flat and labiolingually curved cusps. The acrodine tips are wider than in large morphotype. Length of the maxillary teeth estimates between 2.1–4.7 mm and 5.6– 10 mm with the crown). The width of the crown is placed between 0.6– 1 mm (small morphotype) and 1.2–1.6 mm (large morphotype).

Stratigraphic and geographic range.—Late Permian of the East European Platform.

Figures

Fig. 2. The isolated teeth of actinopterygian fish Isadia from the Sokovka outcrop, Vyazniki, Russia, late Permian (Upper Vyatkian). A–D. Isadia aristoviensis Minikh, 1990, mandibulary teeth. A. ZPAL V.51/1, lingual view. B. ZPAL V.51/2, labial view. C. ZPAL V.51/3, lingual view. D. ZPAL V.51/4, labial view. E–I. Isadia aristoviensis Minikh, 1990, maxillary teeth. E. ZPAL V.51/6, lingual view. F. ZPAL V.51/7, labial view. G. ZPAL V.51/5, lingual view. H. ZPAL V.51/8, lingual view. I. ZPAL V.51/9, labial view. J. Isadia arefievi Minikh, 2015, ZPAL V.51/10, mandibular tooth,?lingual view. K, L. Isadia suchonensis Minikh, 1986, mandibular teeth. K. ZPAL V.51/11, lingual (K1) and lateral (K2) views. L. ZPAL V.51/12, labial view. M. Isadia suchonensis Minikh, 1986, ZPAL V.51/13, maxillary teeth,?labial view. Scale bars 1 mm (A–I), 0.5 mm (J, K, M), 0.2 mm (L).