caa a22 4500 388017155 CHVBK 20180307124914.0 cr unu---uuuuu 161130e199803 xx s 000 0 eng 10.1017/S0022336000036349 doi S0022336000036349 pii (NATIONALLICENCE)cambridge-10.1017/S0022336000036349 New species of the cyathaspidid Poraspis (Agnatha: Heterostraci) from the Late Silurian and Early Devonian of Northwest Territories, Canada [Elektronische Daten] [David K. Elliott, Elizabeth J. Loeffler, Yuhai Liu] Four new species of cyathaspidid extend the range of the genus Poraspis back into the Late Silurian and indicate that the Canadian arctic was its center of origin. Poraspis heintzae n. sp., P. cracens n. sp., P. thules n. sp. and P. parmula n. sp. also increase the known geographic range of the genus which had previously been reported only from the District of Mackenzie (NWT, Canada), Spitsbergen, western and eastern Europe. The identification of P. sericea from the upper member of the Peel Sound Formation substantiates correlation of this interval with the crouchi zone of the Anglo-Welsh Borders, and provides another rare example of a species common to the Canadian arctic and European successions. Copyright © The Paleontological Society Elliott David K. Department of Geology, Box 4099, Northern Arizona University, Flagstaff 86011 aut Loeffler Elizabeth J. Department of Geology, University of Bristol, Bristol BS8 1RJ, England aut Liu Yuhai Institute of Vertebrate Paleontology and Paleoanthropology, Academia Sinica, P.O. Box 643, Beijing, People's Republic of China aut Journal of Paleontology Cambridge University Press 72/2(1998-03), 360-370 0022-3360 72:2<360 1998 72 JPA https://doi.org/10.1017/S0022336000036349 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S0022336000036349 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Elliott David K. Department of Geology, Box 4099, Northern Arizona University, Flagstaff 86011 aut NATIONALLICENCE 700 1- Loeffler Elizabeth J. Department of Geology, University of Bristol, Bristol BS8 1RJ, England aut NATIONALLICENCE 700 1- Liu Yuhai Institute of Vertebrate Paleontology and Paleoanthropology, Academia Sinica, P.O. Box 643, Beijing, People's Republic of China aut NATIONALLICENCE 773 0- Journal of Paleontology Cambridge University Press 72/2(1998-03), 360-370 0022-3360 72:2<360 1998 72 JPA CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge