. Bonner zoologische Monographien. Zoology. ABC D. : Dorsal view of gas bladder of Phoxinus. A: P. eos (KU 4578, mm SL); B: P. phoxinus (KU 22853, mm SL); C: P. oreas (DU field no. B-58-3, mm SL); D: P. tennesseensis (UT 5274, mm SL); E: P. cumberlandensis (UT , mm SL); F: P. cumberlandensis (ANSP 138356, 33 mm SL); G: P. neogaeus (KU 14254, mm SL); H: P. brachyurus (MCZ 3006, mm SL). E F G H Scale bars = 1 mm- The condition in P. erythrogaster is plesiomorphic because it is similar to that in the out- groups, and other conditions are proposed to
. Bonner zoologische Monographien. Zoology. ABC D. : Dorsal view of gas bladder of Phoxinus. A: P. eos (KU 4578, mm SL); B: P. phoxinus (KU 22853, mm SL); C: P. oreas (DU field no. B-58-3, mm SL); D: P. tennesseensis (UT 5274, mm SL); E: P. cumberlandensis (UT , mm SL); F: P. cumberlandensis (ANSP 138356, 33 mm SL); G: P. neogaeus (KU 14254, mm SL); H: P. brachyurus (MCZ 3006, mm SL). E F G H Scale bars = 1 mm- The condition in P. erythrogaster is plesiomorphic because it is similar to that in the out- groups, and other conditions are proposed to be apomorphic. The constriction of the gas bladder is long and narrow in P. phoxinus and neogaeus (TS 32[2]; , G). It is shorter and broader in P. oreas, brachyurus, erythrogaster, cum- berlandensis, and tennesseensis (TS32[1]; ). It is very short, almost absent in P. issykkulensis and eos (TS 32[0]; , 34A). A very short constriction is present in the outgroups, and also in young specimens of Phoxinus species. Length of the constric- tion increases ontogenetically, as shown by P. cumberlandensis (, F). The polari- ty of this transformation series (TS 32) is therefore interpreted as very short [0] —» short [1] - long [2]. The pneumatic duct connects to the anterior portion of the posterior chamber in P. eos, brachyurus, issykkulensis, and tennesseensis (TS 33[1]; ). In other species of Pho-. 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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