Fossil Record 20(1): 9-19, doi: 10.5194/fr-20-9-2016
The Late Devonian placoderm Aspidichthys Newberry, 1873 from the Holy Cross Mountains, Poland
expand article infoPatrycja G. Dworczak, Piotr Szrek§
‡ Institute of Geology, Institute of Geology, Adam Mickiewicz University, 16 Maków Polnych Street, 61-606 Poznań, Poland§ Polish Geological Institute – National Research Institute, 4 Rakowiecka Street, Warsaw, Poland
Open Access
Abstract
The reported placoderm remains from the Holy Cross Mountains, Poland, belongto the species Aspidichthys ingens Koenen, 1883. This study focuseson the material described in the past from Wietrznia Quarry but the newspecimens were also collected form Kowala and Płucki localities. Allspecimens presented here differ from others described in the past, mainlyby having smaller tubercles and possessing a distinctive crest in the anteriormedian part of the median dorsal plate, but did not allow the erection of anew taxon. Based on conodont assemblage, all specimens are attributed to aFrasnian age. Aspidichthys occurs in the middle to the upper partof the Frasnian (Palmatolepis punctata to P. linguiformisconodont zone) and is not found in the Famennian boundary. Describedspecimens also occur in a stepwise deepening environment causedby local synsedimentary tectonics.