. Bonner zoologische Monographien. Zoology. I 117. : Dorsal view of cera- tobranchials, hypobranchials. and basibranchials of Phoxi- nus. A: P. phoxinus (CNUC uncat., mm TL); B: P. eos (KU12255, mm SL); C: P. cumberlandensis (KU 18934, mm SL); D: P. is- sykkulensis (P-10696, mm SL); E: P. oreas (KU 3259. mm SL); F: P. erythwgaster (KU 5773, mm SL). Scale bars = 1 mm. Hypobranchials 1 and 2 () are small bones. No variation with phylogenetic sig- nificance is present among Phoxinus species. Hypobranchial 3 () is a slender bone tapering ventra
. Bonner zoologische Monographien. Zoology. I 117. : Dorsal view of cera- tobranchials, hypobranchials. and basibranchials of Phoxi- nus. A: P. phoxinus (CNUC uncat., mm TL); B: P. eos (KU12255, mm SL); C: P. cumberlandensis (KU 18934, mm SL); D: P. is- sykkulensis (P-10696, mm SL); E: P. oreas (KU 3259. mm SL); F: P. erythwgaster (KU 5773, mm SL). Scale bars = 1 mm. Hypobranchials 1 and 2 () are small bones. No variation with phylogenetic sig- nificance is present among Phoxinus species. Hypobranchial 3 () is a slender bone tapering ventrally. The left and right hy- pobranchials 3 are close to each other at their ventral ends, forming an arch-like struc- ture. Basibranchial 3 runs through the arch (Chen 1986b). Variation exists in size of the hypobranchial 3 relative to the basibranchial 2. In P. phoxinus and issykkulensis, hypo- branchial 3 is elongated and its length is almost equal to that of basibranchial 2 (TS 154[ 1 ]). In other species of Phoxinus, this bone is much shorter than that of basibranchial 2 (TS 154[0]), which is similar to the condition in the outgroups. Basibranchials (). Bones included are three single basibranchials (1, 2 and 3, from anterior to posterior) and placed mesially between the right and left hypobran- 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 Bonn, Zoologisches Forschungsinstitut und Museum Alexander Koenig
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