FIGURE 21 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 21. Mature tubaria of Gothograptus obtectus Kozłowska-Dawidziuk, 1990 from Lithuania, Šiupyliai-69 core, depth 1012.0 m, lundgreni Biozone. A, B, E. finite tubarium with no proximal end, ventro-lateral view, VU RET-19; A, whole specimen; B, enlargement of last thecae; E. enlargement of thecal hood. C–D. proximal part of tubarium, obverse view, VU RET-20; C. enlargement of medial part; D. whole specimen; F–H. fragment of tubarium, lateral-ventral view, VU RET-21; F. whole specimen; G. enlargement of proximal part; H. enlargement of distal part. Abbreviations: genic.—geniculum, lat. ap.— lateral apertural, m–v.—mid-ventral.