Articulated second dorsal spine with the posterior nuchal plate of <i>Qarmoutus hitanensis</i> gen. et sp. nov. Sanaa E. El-Sayed Mahmoud A. Kora Hesham M. Sallam Kerin M. Claeson Erik R. Seiffert Mohammed S. Antar 10.1371/journal.pone.0172409.g016 https://plos.figshare.com/articles/figure/Articulated_second_dorsal_spine_with_the_posterior_nuchal_plate_of_i_Qarmoutus_hitanensis_i_gen_et_sp_nov_/4710883 <p><b>A,</b> Anterior and <b>B,</b> Posterior views.</p> 2017-03-01 18:46:39 opercle UNESCO World Heritage Site articulation marine catfishes phylogenetically basal ariid neurocranium spine New World species pattern ornamentation Ariidae genus African Paleogene taxa nuchal plates Qarmoutu Siluriforme parieto-supraoccipital process Egypt Wadi El-Hitan Birket Qarun Formation Paleogene marine catfishes Eocene Birket Qarun Formation pectoral girdle