Project 420: M. A. O'Leary, B. A. Patel, M. N. Coleman. 2012. New data on the petrosal of Bothriogenys (Mammalia, Artiodactyla, Anthracotheriidae), and petrosal volume and density comparisons among aquatic and terrestrial artiodactyls and outgroups. Journal of Paleontology. 86 (1):44-50.
Specimen: † Bothriogenys gorringei (DUPC:5248)
View: Skull, lateral

Abstract

We report the first detailed endocranial description of the petrosal bone of the ear region in two new specimens of the anthracotheriid artiodactylan Bothriogenys from the Early Oligocene of the Jebel Qatrani Formation, Fayum, Egypt. The new fossils have petrosals with a hyperinflated (pachyostotic) tegmen tympani (the roof over the middle ear), closely resembling the condition in certain cetancodontans such as hippopotamids and basal cetaceamorphans (fossil stem taxa to extant Cetacea). The morphology of the petrosal, particularly its relative size and density, has been considered an important indicator of the ability of a marine mammal to localize sound transmitted in water, yet petrosal size (pachyostosis) and density (osteosclerosis) have not previously been quantified independent of each other. We examine the new fossils in the context of a preliminary CT-based study of petrosal density (extant taxa only) and petrosal volume (extant and extinct taxa) in a sample of artiodactylans and outgroups. In our extant comparative sample, the petrosals of cetaceans are both dense and voluminous as has been previously stated. We find, however, that the tegmen tympani is relatively voluminous (pachyostotic) without being particularly dense (osteosclerotic) in Hippopotamus amphibius, an extant taxon that has been documented to show some aquatic hearing behaviors, albeit less derived ones than those seen in cetaceans. A voluminous tegmen tympani, which is present in ï‚…Bothriogenys, may have specific implications for behavior that are distinct from increases in petrosal density.


Read the article »

Project DOI: 10.7934/P420, http://dx.doi.org/10.7934/P420
This project contains
  • 1570 Media
  • 2 Documents
  • 1 Taxon
  • 2 Specimens
Total size of project's media files: 2.67G

Download Project SDD File
Currently Viewing:
MorphoBank Project 420

    This research
    supported by

    Authors' Institutions

    • American Museum of Natural History

    • Midwestern University

    • Stony Brook University



    Members

    member name taxa specimens media
    Maureen O'Leary
    Project Administrator
    121570
    Mark Coleman
    Full membership
    000
    Biren Patel
    Full membership
    000


    Project has no matrices defined.



    Project views

    type number of views Individual items viewed (where applicable)
    Total project views46476
    Project overview3155
    Media views35505Media search (4186 views); M54045 (613 views); M54046 (573 views); M470812 (208 views); M470858 (164 views); M470814 (221 views); M470894 (158 views); M470834 (206 views); M470778 (228 views); M470867 (159 views); M470824 (208 views); M470809 (197 views); M470835 (192 views); M470828 (219 views); M470871 (144 views); M470877 (168 views); M470843 (174 views); M470859 (152 views); M470885 (182 views); M470815 (199 views); M470865 (161 views); M470808 (192 views); M470878 (155 views); M470888 (164 views); M470861 (167 views); M470777 (198 views); M470892 (165 views); M470831 (181 views); M470840 (168 views); M470863 (160 views); M470883 (172 views); M470805 (198 views); M470825 (193 views); M470836 (178 views); M470860 (150 views); M470810 (212 views); M470842 (180 views); M470817 (191 views); M470893 (158 views); M470849 (183 views); M470873 (182 views); M470891 (162 views); M470876 (180 views); M470869 (157 views); M470887 (174 views); M470838 (179 views); M470803 (244 views); M470864 (158 views); M470800 (194 views); M470830 (191 views); M470802 (204 views); M470855 (164 views); M470801 (217 views); M470844 (165 views); M470879 (154 views); M470806 (280 views); M470833 (177 views); M470847 (158 views); M470822 (195 views); M470854 (166 views); M470866 (156 views); M470881 (149 views); M470837 (182 views); M470890 (153 views); M470813 (200 views); M470819 (194 views); M470846 (148 views); M470820 (209 views); M470851 (153 views); M470839 (170 views); M470804 (213 views); M470880 (149 views); M470827 (192 views); M470829 (211 views); M470848 (156 views); M470872 (161 views); M470853 (145 views); M470875 (152 views); M470856 (153 views); M470841 (168 views); M470857 (172 views); M470811 (196 views); M470826 (211 views); M470862 (160 views); M470889 (154 views); M470882 (153 views); M470823 (186 views); M470789 (196 views); M470852 (163 views); M470999 (99 views); M470897 (92 views); M470931 (107 views); M470944 (94 views); M470983 (107 views); M470909 (99 views); M470956 (95 views); M470981 (98 views); M470807 (205 views); M470874 (156 views); M470821 (201 views); M470886 (150 views); M470818 (213 views); M470868 (154 views); M470832 (212 views); M470816 (182 views); M470845 (146 views); M470850 (159 views); M470870 (169 views); M470884 (155 views); M470895 (107 views); M470896 (100 views); M470898 (89 views); M470899 (97 views); M470900 (93 views); M470901 (104 views); M470902 (85 views); M470903 (114 views); M470904 (97 views); M470905 (95 views); M470906 (102 views); M470907 (114 views); M470908 (98 views); M470910 (93 views); M470911 (96 views); M470912 (89 views); M470913 (109 views); M470914 (95 views); M470915 (103 views); M470916 (90 views); M470917 (97 views); M470918 (89 views); M470919 (99 views); M470920 (117 views); M470921 (114 views); M470922 (100 views); M470923 (98 views); M470924 (95 views); M470925 (90 views); M470926 (93 views); M470927 (92 views); M470928 (84 views); M470929 (87 views); M470930 (95 views); M470932 (98 views); M470933 (103 views); M470936 (93 views); M470938 (111 views); M470941 (103 views); M470943 (95 views); M470945 (89 views); M470946 (94 views); M470947 (134 views); M470949 (96 views); M470951 (104 views); M470953 (96 views); M470955 (99 views); M470957 (92 views); M470958 (96 views); M470959 (96 views); M470960 (97 views); M470961 (99 views); M470962 (86 views); M470963 (106 views); M470964 (95 views); M470965 (102 views); M470966 (95 views); M470967 (88 views); M470968 (95 views); M470969 (116 views); M470970 (102 views); M470971 (102 views); M470972 (103 views); M470973 (98 views); M470974 (92 views); M470975 (100 views); M470976 (92 views); M470977 (85 views); M470978 (109 views); M470979 (97 views); M470980 (97 views); M470982 (99 views); M470984 (96 views); M470985 (94 views); M470986 (101 views); M470987 (143 views); M470988 (94 views); M470989 (95 views); M470990 (97 views); M470991 (95 views); M470992 (93 views); M470993 (98 views); M470994 (94 views); M470995 (91 views); M470996 (118 views); M470997 (109 views); M470998 (103 views); M471000 (103 views); M471001 (99 views); M471002 (98 views); M471003 (101 views); M471004 (93 views); M471005 (95 views); M471006 (93 views); M471007 (91 views); M471008 (99 views); M471009 (90 views); M471010 (112 views); M471011 (135 views); M471012 (108 views); M471013 (116 views); M471014 (113 views); M471015 (93 views); M471016 (91 views); M471017 (97 views); M471018 (95 views); M471019 (95 views); M471020 (97 views); M471021 (96 views); M471022 (100 views); M471023 (109 views); M471024 (100 views); M471025 (103 views); M471026 (98 views); M471027 (100 views); M471028 (119 views); M471029 (97 views); M471042 (2 views); M471063 (2 views); M471059 (2 views); M471074 (1 view); M471090 (2 views); M471060 (1 view); M471061 (1 view); M471048 (1 view); M471092 (1 view); M471066 (1 view); M471054 (1 view); M471075 (2 views); M471044 (1 view); M471053 (1 view); M471091 (1 view); M471057 (1 view); M471058 (1 view); M471035 (1 view); M471070 (1 view); M471065 (2 views); M471077 (1 view); M471046 (3 views); M471099 (1 view); M471071 (1 view); M471080 (1 view); M471076 (1 view); M471110 (1 view); M471188 (1 view); M471086 (1 view); M471097 (1 view); M471088 (1 view); M471037 (1 view); M471031 (1 view); M471033 (1 view); M471150 (1 view); M471079 (4 views); M471068 (1 view); M471084 (2 views); M471093 (1 view); M471034 (2 views); M471101 (1 view); M471112 (1 view); M471135 (1 view); M471051 (1 view); M471169 (1 view); M471030 (1 view); M471118 (1 view); M471073 (1 view); M471096 (1 view); M471175 (1 view); M471050 (1 view); M471038 (1 view); M471045 (1 view); M471047 (2 views); M471178 (1 view); M471064 (2 views); M471043 (1 view); M471083 (1 view); M471087 (1 view); M471168 (1 view); M471102 (1 view); M471040 (1 view); M471085 (1 view); M471095 (2 views); M471089 (2 views); M471192 (1 view); M471173 (1 view); M471081 (1 view); M471153 (1 view); M471041 (1 view); M471177 (1 view); M471111 (2 views); M471036 (1 view); M471157 (1 view); M471078 (2 views); M471067 (1 view); M471104 (1 view); M471191 (1 view); M471082 (1 view); M471204 (1 view); M471056 (1 view); M471049 (1 view); M471055 (1 view); M471039 (1 view); M471069 (1 view); M471072 (1 view); M471123 (1 view); M471156 (1 view); M471184 (1 view); M471140 (1 view); M471098 (1 view); M471103 (1 view); M471100 (1 view); M471154 (1 view); M471182 (1 view); M471113 (2 views); M471196 (1 view); M471052 (1 view); M471062 (1 view); M471148 (1 view); M471189 (1 view); M471163 (1 view); M471164 (1 view); M471152 (1 view); M471167 (1 view); M471134 (1 view); M471115 (1 view); M471126 (1 view); M471124 (1 view); M471107 (1 view); M471198 (1 view); M471117 (1 view); M471130 (1 view); M471139 (1 view); M471149 (1 view); M471151 (1 view); M471160 (1 view); M471133 (1 view); M471144 (1 view); M471166 (1 view); M471190 (1 view); M471136 (1 view); M471180 (1 view); M471155 (1 view); M471183 (1 view); M471159 (1 view); M471143 (1 view); M471170 (1 view); M471145 (1 view); M471114 (1 view); M471195 (1 view); M471147 (1 view); M471194 (1 view); M471202 (1 view); M471129 (1 view); M471128 (1 view); M471171 (1 view); M471108 (2 views); M471187 (1 view); M471174 (2 views); M471172 (1 view); M471138 (1 view); M471131 (1 view); M471165 (1 view); M471197 (1 view); M471106 (1 view); M471109 (1 view); M471122 (1 view); M471193 (1 view); M471200 (1 view); M471121 (1 view); M471161 (1 view); M471162 (1 view); M471125 (1 view); M471105 (1 view); M471127 (1 view); M471181 (2 views); M471186 (1 view); M471199 (2 views); M471176 (1 view); M471158 (1 view); M471132 (1 view); M471179 (1 view); M471137 (2 views); M471142 (1 view); M471116 (1 view); M471203 (1 view); M471120 (1 view); M471146 (1 view); M471185 (1 view); M471141 (1 view); M471201 (1 view); M471119 (1 view);
    Documents list1505
    Specimen list2371
    Taxon list2000
    Views for media list1617
    Bibliography323




    Project downloads

    type number of downloads Individual items downloaded (where applicable)
    Total downloads from project300
    Project downloads299
    Media downloads1M54045 (1 download);