. Bulletin. Science. 36 SOUTHERN CALIFORNIA ACADEMY OF SCIENCES. Fig. 4. Drawing of right saccular otolith of Seriphus lavenbergi, sp. nov. (LACM 55484), holotype, late Miocene, Yorba Member of the Puente Formation, California. Gray areas represent missing por- tions of the otolith. Scale bar equals 5 mm. shape (Fig. 4); 2) a low, nearly horizontal dorsal rim (Fig. 4); 3) a more blunted, nearly vertical posterior rim (Fig. 4); 4) a longer more anteriorly tapering ostium (Fig. 4); 5) a lower caudal curvature index ( vs. in S. politus; Table 2); and 6) the posterior cauda is more gently f
. Bulletin. Science. 36 SOUTHERN CALIFORNIA ACADEMY OF SCIENCES. Fig. 4. Drawing of right saccular otolith of Seriphus lavenbergi, sp. nov. (LACM 55484), holotype, late Miocene, Yorba Member of the Puente Formation, California. Gray areas represent missing por- tions of the otolith. Scale bar equals 5 mm. shape (Fig. 4); 2) a low, nearly horizontal dorsal rim (Fig. 4); 3) a more blunted, nearly vertical posterior rim (Fig. 4); 4) a longer more anteriorly tapering ostium (Fig. 4); 5) a lower caudal curvature index ( vs. in S. politus; Table 2); and 6) the posterior cauda is more gently flexed posteroventrally (Fig. 4). The new species also differs from S. politus in the following: a premaxilla with a much longer alveolar process; and a maxilla that is strongly constricted between the anterior condyle and the posterior extension of the maxillary. Discussion.—The most diagnostic feature of the holotype is the saccular otolith, which has a broad, flat, shallow ostium. The cauda is narrow and horizontal with a curved posterior section. The sulcus is strongly homosulcoid with both the rostrum and antirostrum absent. These features are sufficient to place this speci- men within the family Sciaenidae. The sub-ovate otolith with a subangular ventral margin, ellipitical ostium, and posteroventrally-bent posterior cauda is character- istic of the genus Seriphus. Description.—The holotype of Seriphus lavenbergi (Fig. 3-4) is a disarticu- lated incomplete skull with the right saccular otolith in situ. The specimen is preserved as brown bone in white diatomaceous shale. The neurocranium measures mm in length and mm at greatest width. The preserved elements of the skull are difficult to interpret because of damage. The frontals and lateral ethmoids appear to be preserved in ventral view. The paired triangular frontals are by far the largest bone in the skull roof and account for the anterior half of the neural cranium. The lateral ethmoids are paired, modera
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