FIGURE 17 in Evolutionary significance of the retiolitine Gothograptus (Graptolithina) with four new species from the Silurian of the East European Platform (Baltica), Poland and Lithuania

FIGURE 17. Mature tubaria of Gothograptus kozlowskii Kozłowska-Dawidziuk, 1990 from the Šiupyliai-69 core, depth 1009.1 m, lundgreni Biozone, Lithuania. A–E. mature tubarium with seven pairs of thecae, VU RET-17; A. whole specimen, ventro-lateral view; B. enlargement of distal part of tubarium; C. enlargement of medial part of tubarium; D, E. orifice of th31. F. fragment of mature tubarium showing overgrown proximal ventral orifice, ventral view, VU RET-18.