A new diatom (Bacillariophyta) species - <i>Sellaphora lucectoriana</i> sp. nov. - from a glacial lakes in Kackar Mountain (Eastern Blacksea Region), Rize, Republic of Turkiye

Kaskar Mountains is located in the Eastern Black Sea Region in Turkiye. The mountain-ous area includes granite and volcanic rocks influencing water conditions. Mosar Lake is located at 40 & DEG;42'35" N and 40 & DEG;54'51" E in the Versenik Valley with an altitude of 3.060 m. a.s.l. The samples were collected in July 2015 from epilithic and epipelic substrata. Epilithic samples were collected using a toothbrush and epipelic samples collected using a pipette. The description of the new spe-cies Sellaphora lucectoriana sp. nov. were given in this study. Valve apices and striae density are diagnostic characters for S. lucectoriana. Sellaphora hentiensis (Kulikovskiy, Lange-Bertalot, A.Witkowski & Dorofeyuk) C.E.Wetzel & Ector and S. laticeps (Hustedt) C.E.Wetzel, Ector, Van de Vijver, Compere & D.G.Mann are similar in morphology and general outline. S. hentiensis is the most similar, however, S. lucectoriana has subcapitate apices and a higher striae density. S. laticeps has larger valves with abruptly protracted and broadly capitate apices.