Just out | Tainoceratid and Liroceratid Nautilids from the Upper Mississippian Imo Formation of Arkansas, Midcontinent North America @ Paleontological Research


Just out @ Paleontological Research


Tainoceratid and Liroceratid Nautilids from the Upper Mississippian Imo Formation of Arkansas, Midcontinent North America


Author(s)

Shuji Niko and Royal H. Mapes


Abstract:

As the third installment of our study to describe the cephalopod fauna of the Upper Mississippian Imo Formation, four species of late Chesterian (= Serpukhovian; late early Carboniferous) nautilids are recorded from the dark gray shale of the formation in northwest Arkansas, Midcontinent North America. They include a tainoceratid, Tylonautilus gratiosus (Girty), and three liroceratids, Bistrialites bicostatus (Gordon), Condraoceras? sp. and Peripetoceras kummeli sp. nov. Diagnostic features of P. kummeli separating it from comparable species are its depressed reniform whorl sections with relatively high width/height ratios, large convergent angle of the flanks, and subcentral to subdorsal siphuncular position.


READ IT HERE:

http://www.bioone.org/doi/abs/10.2517/2016PR020

Lurdes Fonseca

Assistant Professor and Researcher at University of Lisbon
Sociologist (PhD), Paleontologist (Researcher in Micropaleontology), Majors in Sociology and Biology, Minor in Geology. Main interests in Paleontology: Microfossils, Molecular fossils, Paleobiology and Paleoecology. (read more about me)