FIGURE 22. A–F 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 22. A–F. mature tubarium of Gothograptus velo n. sp., holotype, Zawada 1 core, depth 1533.3–1540.0 m, upper part of lundgreni Biozone, Poland, ZPAL G.XIII/35, specimen with nine pairs of thecae. A. lateral-ventral view of specimen; B. enlargement of distal part of tubarium; C. enlargement of proximal end; D. view of outer ancora from outside; E–F. enlargements of th71. Abbreviations: anc.—ancora, lat. ap.—lateral apertural, v.—ventral, th—theca.