. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Figure 21. Psenops/s cyoneo, an elongate species, drawing of a 139-mm specimen, BMNH 1890. 11. 28. 9, from Alcock, 1892. tion to the superficial similarity between these two genera. Description. Body moderately deep to deep, maximum depth 30 to 45 j^er cent of the standard length, compressed but fairly thick; musculature soft. Peduncle short, deep, and compressed. Dorsal fin originat- ing over or slightly behind insertion of pec- toral fins, continuous, with five to seven short spines increasing in length to the 27 to
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Figure 21. Psenops/s cyoneo, an elongate species, drawing of a 139-mm specimen, BMNH 1890. 11. 28. 9, from Alcock, 1892. tion to the superficial similarity between these two genera. Description. Body moderately deep to deep, maximum depth 30 to 45 j^er cent of the standard length, compressed but fairly thick; musculature soft. Peduncle short, deep, and compressed. Dorsal fin originat- ing over or slightly behind insertion of pec- toral fins, continuous, with five to seven short spines increasing in length to the 27 to 32 rays. The last spine the longest, but less than half the length of the longest dor- sal finray. Anal and genital pore well before or at mid-body, in a slit. Anal fin originating well before or slightly behind mid-body, three spines increase in length to the 22 to 29 rays. Number of dorsal finrays never exceeds number of anal fin- rays by more than five. Pectoral fins rounded in the young, usually produced in the adult. Pelvic fins inserting directly under origin of the pectoral fin, attached to the abdomen by a small membrane and folding into a grooxe which reaches to the anus. Caudal fin broad, slightly forked. Small cycloid scales, very deciduous, cov- ering fleshy bases of the median fins. Lat- eral line moderately high, following dorsal profile and extending onto peduncle. Skin very thin; main subdennal canal along inter- muscular septum and side branches clearh' visible, canals particularly dense on back. pores very small. Head around 30 per cent of the standard length. Top of head naked, minute pores faintly visible, naked skin not projecting or projecting only slightly back- wards over the nape. Eye moderate to large. Adipose tissue around eye developed and extending forward around the nostrils. Nostrils near tip of truncate snout, mod- erate in size, the anterior round, the pos- terior a slit. Maxillary extending below eye, angle of gape at anterior border of eye. P
Size: 2378px × 1051px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorharvarduniversity, bookcentury1900, booksubjectzoology
