DOI: 10.5061/dryad.v1jv1
title: Data from: New Cretaceous lungfishes (Dipnoi, Ceratodontidae) from western North America

description: Ceratodontid lungfishes are generally rare, poorly represented elements of
 North America’s Mesozoic ecosystems, with previously known maximum
 diversity in the Late Jurassic. Herein we describe four new species of the
 form genus Ceratodus, from the Cretaceous of the Western Interior,
 considerably expanding fossil representation of post-Triassic dipnoans in
 North America. To model taxonomic and morphologic diversity, we adopt a
 four-fold system of phenetically based species groups, named for exemplars
 from the Morrison Formation. Ceratodus kirklandi n. sp. (Potamoceratodus
 guentheri group) and C. kempae n. sp. (C. frazieri group) represent a
 hitherto unsampled time interval, the Valanginian. Ceratodus nirumbee n.
 sp. and C. molossus n. sp. extend the temporal ranges of the C. fossanovum
 and C. robustus groups upward to the Albian and Cenomanian, respectively.
 These new occurrences show that ceratodontids maintained their highest
 diversity from the Late Jurassic through the mid-Cretaceous
 (Albian–Cenomanian), an interval of ~60 Myr. The existing record suggests
 that some of the later (mid-Cretaceous) ceratodontids may have been
 tolerant of salt water; to date, there is no evidence that they
 aestivated. Only a few occurrences are known from horizons younger than
 Cenomanian. Demise of ceratodontids appears to be part of a broader
 pattern of turnover that occurred at the Cenomanian-Turonian boundary in
 North America.
description: Supplemental data
 explanationSupplemental_Data_File_1_BYU_20808Ceratodus kirklandi n. sp., BYU 20808 (holotype), right pterygopalatine plate. Specimen from BYU locality 1667, Grand County, Utah; Yellow Cat Member, Cedar Mountain Formation, Lower Cretaceous (Valanginian).Supplemental_Data_File_2_BYU_20809Ceratodus kirklandi n. sp., BYU 20809, left prearticular plate. Specimen from BYU locality 1667, Grand County, Utah; Yellow Cat Member, Cedar Mountain Formation, Lower Cretaceous (Valanginian).Supplemental_Data_File_3_NCSM_30253Ceratodus molossus n. sp., NCSM 30253 (holotype), right pterygopalatine plate; locality near Emery, Emery County, Utah, Mussentuchit Member, Cedar Mountain Formation, Upper Cretaceous (Cenomanian).Supplemental_Data_File_4_MNAV_10649Ceratodus molossus n. sp., MNA.V.10649, right prearticular plate; MNA locality 1067, Garfield County, Utah, Naturita Formation, Upper Cretaceous (Cenomanian).Supplemental_Data_File_5_UMNH_16774Ceratodus molossus n. sp., UMNH 16774 (cast), right pterygopalatine plate; locality near Escalante, Garfield County, Utah, Naturita Formation, (Cenomanian).Supplemental_Data_File_6_OMNH_34765Ceratodus nirumbee n. sp., OMNH 34765 (holotype), right prearticular plate; OMNH locality V1061, Carbon County, Montana, Cloverly Formation, Lower Cretaceous (Albian).Supplemental_Data_File_7_BYU_20814Ceratodus kempae, n. sp., BYU 20814 (holotype), right pterygopalatine plate; BYU locality 1783, Grand County, Utah; Yellow Cat Member, Cedar Mountain Formation, Lower Cretaceous (Valanginian).Supplemental_Data_File_8_OMNH_60408Ceratodus frazieri, OMNH 60408, right prearticular plate; OMNH locality 1075, Big Horn County, Montana; Cloverly Formation, Lower Cretaceous (Albian).Supplemental_Data_File_9_OMNH_66043Ceratodus gustasoni, OMNH 66043, left prearticular plate; OMNH locality V808, Garfield County, Utah; Naturita Formation, Upper Cretaceous (Cenomanian).