Agastograptus, a synonym of Plectograptus (Retiolitidae, Graptolithina) Author Kozłowska-Dawidziuk, Anna text Acta Palaeontologica Polonica 2002 2002-12-31 47 3 459 467 journal article 300550 10.5281/zenodo.13173828 3dbd2041-0711-4651-bdf5-2d771a498f0c 1732-2421 13173828 Neogothograptus balticus ( Eisenack, 1951 ) Fig. 3B, E, F . Retiolites balticus Eisenack ; Eisenack 1951: 134–136 , pl. 22: 4–8, pl. 24: 5. Gothograptus nassa (Holm) ; Moberg and Törnquist 1909: 19 , pl. 1: 14. Holoretiolites ( Balticograptus ) balticus Eisenack ; Bouček and Münch 1952: 17–19 , fig. 5b. Neogothograptus balticus (Eisenack) ; Kozłowska−Dawidziuk 1995: 304 , fig. 27I. Diagnosis .—See Kozłowska−Dawidziuk 1995 . Description .—The preservation and features (measurements of thecae, ancora umbrella, ancora sleeve, apertural processes) of the new material are consistent with N. balticus described before ( Eisenack 1951 ; Kozłowska−Dawidziuk 1995 ). Discussion .— Neogothograptus balticus demonstrates the presence of a strong, clearly single, reticular apertural hood ( Fig. 3E, F ), in contrast to the paired processes of Spinograptus ( Fig. 3C, G ). The specimen described as G. nassa by Moberg and Törnquist (1909) was examined by the author in 1993 in Lund University, and was recognized to be N. balticus . It possesses less ancora sleeve reticulum than G. nassa , distinctive single reticular apertural processes, and an ancora sleeve list arrangement characteristic of N. balticus , as well as a free nema. These features contrast to the dense ancora sleeve reticulum, solid microfusellar apertural hood, and nema incorporated to the ancora sleeve wall of G. nassa (see Kozłowska−Dawidziuk 1999 ), a species restricted to the P. dubius – G. nassa Biozone. The Moberg and Törnquist specimen co−occurs with the same Ludlow assemblage of graptolites Neodiversograptus nilssoni , Plectograptus macilentus , and Spinograptus spinosus , like the type . Material .— 16 specimens from Baltic erratic boulder 46 from Jarosławiec, Poland , containing of N. balticus and Plectograptus macilentus , Saetograptus chimaera , Bohemograptus bohemicus , Neodiversograptus beklemishevi , Pristiograptus dubius , Monoclimacis sp. , and Crinitograptus crinitus ?. Occurrence .— Neogothograptus balticus occurs in Neodiversograptus nilssoni Biozone from erratic boulder of Kaliningrad area, Russia ( Eisenack 1951 ), in Lobograptus progenitor ( Kozłowska−Dawidziuk 1995 ) and in Bohemograptus bohemicus biozones of Poland (see above).