Neogothograptus thorsteinssoni Lenz and Kozłowska−Dawidziuk, 2004

Kozłowska, Anna, Lenz, Alfred & Melchin, Michael, 2009, Evolution of the retiolitid Neogothograptus (Graptolithina) and its new species from the upper Wenlock of Poland, Baltica, Acta Palaeontologica Polonica 54 (3), pp. 423-434 : 432

Neogothograptus thorsteinssoni Lenz and Kozłowska−Dawidziuk, 2004

Fig. 8 .

2004 Neogothograptus thorsteinssoni sp. nov.; Lenz and KozłowskaDawidziuk 2004: 19, pl. 7: 1, 2, 5, 7, 8; pls. 8–10; pl. 26: 5, 6. 2004 Neogothograptus thorsteinssoni Lenz and Kozłowska−Dawidziuk,

2004, Maletz 2008: 296, figs. 1O, 13I.

Holotype: GSC 125981 .

Type locality and age: Northeastern Cornwallis Island, unnamed creek, talus concretion, Arctic Canada; Lower Ludlow, Lobograptus progenitor Biozone.

Material.— Thirty specimens, mostly fragments from the Bartoszyce borehole depth 1598.0 m, EEP, Poland; Neodiversograptus nilssoni Biozone, Ludlow. It co−occurs with Neodiversograptus nilssoni , Bohemograptus bohemicus ?, Colonograptus auctus , P. dubius , Neogothograptus purus , Kirkigraptus inexpectans , Spinograptus spinosus , Plectograptus sp.

Discussion.—The new material represents well−preserved fragments from every part of the rhabdosome ( Fig. 8 ).

Stratigraphic and geographic range. —Ludlow: Neodiversograptus nilssoni Biozone, Bartoszyce borehole, Poland; Lobograptus progenitor Biozone, Arctic Canada.

Figures

Fig. 8. SEM micrographs of rhabdosomes of Neogothograptus thorsteinssoni Lenz and Kozłowska−Dawidziuk, 2004, Bartoszyce borehole 1598.0 m, Neodiversograptus nilssoni Biozone. A. Obverse view of finite rhabdosome with five pairs of thecae and appendix, lateral−ventral view. B. Lateral view of distal end of rhabdosome with appendix and nema (B1); enlargement of distal part of appendix with thick nema (B2). C. Ventral−lateral view of distal part of rhabdosome with appendix. D. Proximal part of reverse side of rhabdosome with three pairs of thecae (D1); enlargement of ancora region with outer ancora, and first theca (D2).