FIGURE 4 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 4. Proximal ends of young and mature tubaria of (A–B) Gothograptus auriculatus n. sp., Bartoszyce IG-1 core, depth 1645.2 m, praedeubeli Biozone, light blue colour indicates ancora umbrella rim; A. immature tubarium with the first three thecae, obverse view, ZPAL G.55/6. B. mature tubarium, obverse view, with wide lists above proximal lateral orifice (dark blue), ZPAL G.55/23. C, D, E, G, H. Gothograptus nassa (Holm, 1890), Mulde Marl, Blåhäll, Gotland, Sweden Locality 813- 832, Blåhäll 1 (Spjeldnaes 1984); C. inside view of proximal end with sicula rim, ZPAL G.55/8. D. outside view of ancora, stereopair, ZPAL G.55/9. E, outside view of ancora, stereopair, ZPAL G.55/10. G. stereopair of proximal end, ventral view, ZPAL G.55/11; H. lateral view with colored reticulated wall of metasicula, ZPAL G.55/12. F. Gothograptus kozlowskii Kozłowska-Dawidziuk, 1990; erratic boulder, Jarosławiec 147, Poland, lundgreni Biozone, outside view of proximal end, with outer ancora, ZPAL G.XIII/43. Abbreviations: anc.—ancora umbrella, lat.—lateral, m-v—mid-ventral list, prox.—proximal, orif.—orifice, th—theca, umb.—umbrella.