. Bulletin. Natural history; Natuurlijke historie. ^>. â ^ ^^ Fig. 12. 5. olseni. A, outline of body form, Lazy Lucy tracing of YPM 6538; B, camera lucida drawings of dorsal ridge scales in YPM specimens 6538, 8907, 8891. Scale = 5 mm. of Other Semionotus bearing simple scales, the scales in this species are almost knife-like, and larger than in other species, such as S. kirschi (Fig. 12B). S. olseni is relatively deep bodied, with a deep head and caudal peduncle. The fins are placed approximately as in other semionotids, the caudal peduncle is moderately deep, and the slope of the forehead
. Bulletin. Natural history; Natuurlijke historie. ^>. â ^ ^^ Fig. 12. 5. olseni. A, outline of body form, Lazy Lucy tracing of YPM 6538; B, camera lucida drawings of dorsal ridge scales in YPM specimens 6538, 8907, 8891. Scale = 5 mm. of Other Semionotus bearing simple scales, the scales in this species are almost knife-like, and larger than in other species, such as S. kirschi (Fig. 12B). S. olseni is relatively deep bodied, with a deep head and caudal peduncle. The fins are placed approximately as in other semionotids, the caudal peduncle is moderately deep, and the slope of the forehead wkk respect to horizontal is about 50-60°. The classification function (Table 1) describes quantitatively the shape of this species relative to all others, but because using the classification function for identification can be unwieldy, I also provide an outline drawing of this species (Fig. 12A) and a summary of individual measurements (Tables 7, 8). There are 33-37 (mean = 35) lateral line scales. The pelvic fin origina'tes between the 8th and 10th vertical scale row, the anal fin between rows 17-19, and the dorsal fin between rows 18-22, but always one or more scale rows behind the anal fin. Meristic data are summarized in Table 9. No specimens that have intercalated scale rows dorsal to the lateral line and anterior to the dorsal fin are known. Flank scales are largest in the anterior region near the lateral line. They decrease in size both caudally and anterodorsally. The scales along the dorsal and ventral midline of the caudal peduncle are enlarged. From the lateral line, there are 9-11 scales to the dorsal fin and about 9 to the origin of the anal Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Peabody Museum of Natural History. New Haven : The Museum
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