Fig. 1 in The morphology and fine structure of the Ordovician Cephalodiscus-like genus Melanostrophus

Fig. 1. Melanostrophus fokini Öpik, 1930. Upper Ordovician (Kukruse Stage, C β), Ubja (Estonia). Fragment of the specimen, preserved in the limestone 2 matrix; ZPAL Pb 6/1. SEM micrographs. A. Fragment of a middle part of the colony made of rather closely packed tubes. B, C. Lateral offshoots of the tubes. D. Tubes connected with the anastomosis. E. Part of a distal portion of the colony made of loosely arranged tubes. F. Bifurcation of the tube. Abbreviations: a, anastomosis; b, bundle of tubes; m, matrix; o, lateral offshoot of the tube; t, tube. Arrows in B indicate fusellar sutures or their impressions.