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Dawidziuk, 2002, C. praedubeli/C. deubeli Biozone, Arctic Canada. 28. Spinograptus spinosus Wood, 1900, L. nilssoni Biozone, EEP, Poland. 29. Spinograptus latespinosus Kozłowska−Dawidziuk, 1997. 30. Spinograptus munchi Eisenack, 1951, C. praedubeli/C. deubeli Biozone, EEP, Poland. 31. Papiliograptus papilio Lenz and Kozłowska−Dawidziuk, 2002, C. praedubeli/C. deubeli Biozone, Arctic Canada. 32. Plectograptus? karlsteinensis Kozłowska−Dawidziuk, Lenz, and Štorch, 2001, C. praedubeli/C. deubeli Biozone, Barrandian. 33. Neogothograptus thorsteinssoni Lenz and Kozłowska−Dawidziuk, 2004, L. progenitor Biozone, Arctic Canada. 34. Neogothograptus alatiformis Lenz and Kozłowska−Dawidziuk, 2004, L. progenitor Biozone, Arctic Canada. 35. Neogothograptus purus Kozłowska−Dawidziuk, 1995, EEP, Poland. 36. Holoretiolites mancki (Münch, 1931). 37. Holoretiolites helenaewitoldi sp. nov., L. progenitor Biozone, EEP, Poland. 38. Plectograptus wimani Eisenack, 1951, N. nilssoni Biozone, Baltic erratic boulder, Poland. 39. Plectograptus robustus Obut and Zaslavskaya, 1983, L. nilssoni Biozone, EEP, Kaliningrad. 40. Plectograptus macilentus Törnquist, 1887, L. scanicus Biozone, Baltic erratic boulder, Poland. 41. Semiplectograptus urbaneki Kozłowska−Dawidziuk, 1995, Cucullograptus hemiaversus/C. aversus Biozone, EEP, Poland. 42. Plectodinemagraptus gracilis Kozłowska−Dawidziuk, 1995, Cucullograptus hemiaversus/C. aversus Biozone, EEP, Poland. Figures adapted from: 1, Melchin (1999); 2, 4–5, Bouček and Münch (1944); 3, holotype photographed by A. Lenz; 6, 9, Bates and Kirk (1992); 7, Bates and Kirk (1997); 8, Štorch (1994); 10–15, 38, 40–42, Kozłowska−Dawidziuk (1995); 16, Kozłowska−Dawidziuk (2001); 17–21, Lenz and Kozłowska−Dawidziuk (2001); 22, 25, Kozłowska−Dawidziuk (1990); 23, 35, photo taken by author; 24, 32, Kozłowska−Dawidziuk et al. (2001); 26, 27, 31, Lenz and Kozłowska−Dawidziuk (2002a); 28, 35, photo taken by author; 29, Kozłowska−Dawidziuk (1997); 30, Kozłowska−Dawidziuk 2002; 36, Kozłowska−Dawidziuk and Lenz (2001); 37, this paper; 39, Obut and Zaslavskaya (1983). Not to scale. Abbreviations: RD, Rhuddanian; SHEIN, Sheinwoodian; GORST, Gorstian; LUDF, Ludfordian. Biozonal scheme after Koren' et al. 1996; Geological time scale by International Commission on Stratigraphy, International Union of Geological Sciences 2004 (www.stratigraphy.org) in Evolution of retiolitid graptolites-a synopsis

Dawidziuk, 2002, C. praedubeli/C. deubeli Biozone, Arctic Canada. 28. Spinograptus spinosus Wood, 1900, L. nilssoni Biozone, EEP, Poland. 29. Spinograptus latespinosus Kozłowska−Dawidziuk, 1997. 30. Spinograptus munchi Eisenack, 1951, C. praedubeli/C. deubeli Biozone, EEP, Poland. 31. Papiliograptus papilio Lenz and Kozłowska−Dawidziuk, 2002, C. praedubeli/C. deubeli Biozone, Arctic Canada. 32. Plectograptus? karlsteinensis Kozłowska−Dawidziuk, Lenz, and Štorch, 2001, C. praedubeli/C. deubeli Biozone, Barrandian. 33. Neogothograptus thorsteinssoni Lenz and Kozłowska−Dawidziuk, 2004, L. progenitor Biozone, Arctic Canada. 34. Neogothograptus alatiformis Lenz and Kozłowska−Dawidziuk, 2004, L. progenitor Biozone, Arctic Canada. 35. Neogothograptus purus Kozłowska−Dawidziuk, 1995, EEP, Poland. 36. Holoretiolites mancki (Münch, 1931). 37. Holoretiolites helenaewitoldi sp. nov., L. progenitor Biozone, EEP, Poland. 38. Plectograptus wimani Eisenack, 1951, N. nilssoni Biozone, Baltic erratic boulder, Poland. 39. Plectograptus robustus Obut and Zaslavskaya, 1983, L. nilssoni Biozone, EEP, Kaliningrad. 40. Plectograptus macilentus Törnquist, 1887, L. scanicus Biozone, Baltic erratic boulder, Poland. 41. Semiplectograptus urbaneki Kozłowska−Dawidziuk, 1995, Cucullograptus hemiaversus/C. aversus Biozone, EEP, Poland. 42. Plectodinemagraptus gracilis Kozłowska−Dawidziuk, 1995, Cucullograptus hemiaversus/C. aversus Biozone, EEP, Poland. Figures adapted from: 1, Melchin (1999); 2, 4–5, Bouček and Münch (1944); 3, holotype photographed by A. Lenz; 6, 9, Bates and Kirk (1992); 7, Bates and Kirk (1997); 8, Štorch (1994); 10–15, 38, 40–42, Kozłowska−Dawidziuk (1995); 16, Kozłowska−Dawidziuk (2001); 17–21, Lenz and Kozłowska−Dawidziuk (2001); 22, 25, Kozłowska−Dawidziuk (1990); 23, 35, photo taken by author; 24, 32, Kozłowska−Dawidziuk et al. (2001); 26, 27, 31, Lenz and Kozłowska−Dawidziuk (2002a); 28, 35, photo taken by author; 29, Kozłowska−Dawidziuk (1997); 30, Kozłowska−Dawidziuk 2002; 36, Kozłowska−Dawidziuk and Lenz (2001); 37, this paper; 39, Obut and Zaslavskaya (1983). Not to scale. Abbreviations: RD, Rhuddanian; SHEIN, Sheinwoodian; GORST, Gorstian; LUDF, Ludfordian. Biozonal scheme after Koren' et al. 1996; Geological time scale by International Commission on Stratigraphy, International Union of Geological Sciences 2004 (www.stratigraphy.org)