caa a22 4500 388017236 CHVBK 20180307124914.0 cr unu---uuuuu 161130e199803 xx s 000 0 eng 10.1017/S0022336000036271 doi S0022336000036271 pii (NATIONALLICENCE)cambridge-10.1017/S0022336000036271 Two new cirroidean genera (Vetigastropoda, Archaeogastropoda) from the Emsian (Late Early Devonian) of Alaska with notes on the early phylogeny of Cirroidea [Elektronische Daten] [Jiří Frýda, Robert B. Blodgett] Two new cirroidean gastropod genera, Alaskiella (family Porcelliidae) and Alaskacirrus (family Cirridae), from the Emsian (late Early Devonian) of west-central Alaska (Medfra B-4 quadrangle) are described. The shell of Alaskiella medfraensis new genus and species exhibits inclined heterostrophic coiling. This shell character is known among other members of the subclass Archaeogastropoda, but is recorded for the first time within members of the superfamily Cirroidea. Inclined heterostrophic coiling of the shell was probably developed independently in several different groups of the subclass Archaeogastropoda. The new genus Alaskacirrus, represented by Alaskacirrus bandeli new species, is the oldest and only known Paleozoic member of the family Cirridae. This suggests that the family Cirridae was separated from the family Porcelliidae since at least Early Devonian time and that it most probably developed from the subfamily Agnesiinae of the family Porcelliidae. Thus, the stratigraphic range of the family Cirridae is at least from Lower Devonian to Cretaceous, an interval of about 350 million years. Copyright © The Paleontological Society Frýda Jiří Czech Geological Survey, Klárov 3, 118 21 Praha 1, Czech Republic aut Blodgett Robert B. Department of Zoology, Oregon State University, Corvallis 97331 aut Journal of Paleontology Cambridge University Press 72/2(1998-03), 265-273 0022-3360 72:2<265 1998 72 JPA https://doi.org/10.1017/S0022336000036271 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S0022336000036271 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Frýda Jiří Czech Geological Survey, Klárov 3, 118 21 Praha 1, Czech Republic aut NATIONALLICENCE 700 1- Blodgett Robert B. Department of Zoology, Oregon State University, Corvallis 97331 aut NATIONALLICENCE 773 0- Journal of Paleontology Cambridge University Press 72/2(1998-03), 265-273 0022-3360 72:2<265 1998 72 JPA CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge