Fig. 8. SEM micrographs of Plectograptus mobergi sp. nov. A. Immature rhabdosome, ZPAL G.27/1, Baltic erratic boulder No. 46, Jarosławiec, Poland, Ludlow; A1, reverse view of proximal fragment, triple junctions of ancora sleeve with pleural lists indicated by arrows; A2, inside view showing shape of ancora umbrella and shape of rhabdosome in cross section; A, enlargement with part of ancora umbrella and theca 12; A, outside view of ancora umbrella 3 4 proximal to theca 11. B. Obverse view of rhabdosome with three pairs of thecae and long virgella preserved, holotype, Stoltera, Germany, MB.G 1091, Stoltera, Germany, Ludlow. C. Oblique view of theca 11 side of immature specimen, ZPAL G.39/3, Mielnik borehole, depth 978.9 m, Poland, Ludlow. Note that the obverse and reverse lists of the ancora umbrella are unusually long, and have portions of the ancora rim attached to them. D. Mature rhabdosome, with malformation and regeneration in the distal part of the rhabdosome, ZPAL G.39/4, Jarosławiec, Baltic erratic boulder No. 54, Poland, Ludlow: D, reverse view of rhabdosome—stereopair; D, ventral view of theca 11 side.

Published as part of Bates, Denis E.B., Kozłowska, Anna, Maletz, Jörg, Kirk, Nancy H. & Lenz, Alfred, 2006, The Silurian retiolitid graptolite Plectograptus: New observations and new species, pp. 525-540 in Acta Palaeontologica Polonica 51 (3) on page 536, DOI: 10.5281/zenodo.13651659