FIGURE 6. Internal view of the structural features of the thecal framework of Gothograptus. A. Pleural list and socket, ZPAL G.55/40; B. View looking distally of lateral apertural rod curving distally into ventral lip, ZPAL G.55/41; C, E, nema with connecting rod, ZPAL G.55/41, ZPAL G.55/37; D, G. pleural list at side of thecal orifice, ZPAL G.55/42, ZPAL G.55/41. F. midventral list with traces of zigzag fusellar suture, their courses shown by the white bars. ZPAL G.55/43. A–E, G. Mulde Marl, Blåhäll, Gotland, Sweden Locality 813-832, Blåhäll 1 (Spjeldnaes 1984). F. Mulde Marl, Dapps 2, Gotland, Sweden (Calner & Jeppsson 2003). H. internal diagrammatic representation of the lists. The seams are coloured brown.

Published as part of Kozłowska, Anna, Bates, Denis, Zalasiewicz, Jan & Radzevičius, Sigitas, 2019, Evolutionary significance of the retiolitine Gothograptus (Graptolithina) with four new species from the Silurian of the East European Platform (Baltica), Poland and Lithuania, pp. 435-469 in Zootaxa 4568 (3) on page 443, DOI: 10.11646/zootaxa.4568.3.2, http://zenodo.org/record/2601607