Here, the semicircular canals of the most aquatic seal, the rare Antarctic Ross Seal (Ommatophoca rossii), are presented for the first time, along with representatives of every species in the Lobodontini: the leopard seal (Hydrurga leptonyx), Weddell seal (Leptonychotes weddellii), and crabeater seal (Lobodon carcinophagus). Because encounters with wild Ross seal are rare, and few specimens are available in collections worldwide, this dataset increases accessibility to a rare species. For further comparison, we present the bony labyrinths of other carnivorans, the elephant seal (Mirounga leonina), harbor seal (Phoca vitulina), walrus (Odobenus rosmarus), South American sea lion (Otaria byronia). 

Odobenus rosmarus MVZ 125566 View specimen

M3#173 Surface of the semicircular canals and cochlea of the walrus, Odobenus rosmarus Type: "3D_surfaces" doi: 10.18563/m3.sf.173   state:published

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Phoca vitulina UZNH 17973 View specimen

M3#174 Endocast surface of the semicircular canals and cochlea of the harbor seal, Phoca vitulina. Type: "3D_surfaces" doi: 10.18563/m3.sf.174   state:published

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Hydrurga leptonyx MLP 14.IV.48.11 View specimen

M3#285 Endocast surface of the semicircular canals and cochlea of the leopard seal, Hydrurga leptonyx. Type: "3D_surfaces" doi: 10.18563/m3.sf.285   state:published

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Leptonychotes weddellii IAA 02-13 View specimen

M3#288 Endocast surface of the semicircular canals and cochlea of the Weddell seal Leptonychotes weddellii. Type: "3D_surfaces" doi: 10.18563/m3.sf.288   state:published

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Lobodon carcinophagus IAA 530 View specimen

M3#286 Endocast surface of the semicircular canals and cochlea of the crabeater seal, Lobodon carcinophagus. Type: "3D_surfaces" doi: 10.18563/m3.sf.286   state:published

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Ommatophoca rossii MACN 48259 View specimen

M3#176 Endocast surface of the semicircular canals and cochlea of the Ross seal Ommatophoca rossii. Type: "3D_surfaces" doi: 10.18563/m3.sf.176   state:published

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Mirounga leonina IAA 03-5 View specimen

M3#287 Right endocast surface of the semicircular canals and cochlea of the elephant seal, Mirounga leonina. Type: "3D_surfaces" doi: 10.18563/m3.sf.287   state:published

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This contribution contains the 3D model described and figured in the following publication: Albino, A., Carrillo-Briceño, J. D. & Neenan, J. M. 2016. An enigmatic aquatic snake from the Cenomanian of northern South America. PeerJ 4:e2027 http://dx.doi.org/10.7717/peerj.2027 

Lunaophis aquaticus MCNC-1827-F View specimen

M3#116 Articulated precloacal vertebrae of Lunaophis aquaticus Type: "3D_surfaces" doi: 10.18563/m3.sf.116   state:published

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