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Line drawings showing the basic morphological differences in the humeri of two different genera of extant Monachine. Five specimens of the leopard seal (Hydrurga leptonyx) indicated by full lines and one specimen of the Weddell seal (Leptonychotes weddellii) indicated by a dashed line. All specimens rescaled to the same proximodistal size. Arrows indicate the most important differences in the humerus between both genera.
