. Bonner zoologische Monographien. Zoology. 28 2. Posterior barbel (Fig.4A-B). The posterior barbel of Couesius is a papillate appendage derived from the upper rictal tissue which is not homologous with the barbels of other "barbeled cyprinids,? (i.e.. cyprinins) (Howes 1985). This posterior barbel is located at the corner of the mouth, and present in Couesius only (Fig.4A). - TS 2: A posterior barbel absent [0], or present [1]. 3. Primary lamellae of the olfactory organ (Fig.5A-B). The primary lamellae of the ol- factory organ are arranged at both sides (lateral and medial) of the axis i
![. Bonner zoologische Monographien. Zoology. 28 2. Posterior barbel (Fig.4A-B). The posterior barbel of Couesius is a papillate appendage derived from the upper rictal tissue which is not homologous with the barbels of other "barbeled cyprinids,? (i.e.. cyprinins) (Howes 1985). This posterior barbel is located at the corner of the mouth, and present in Couesius only (Fig.4A). - TS 2: A posterior barbel absent [0], or present [1]. 3. Primary lamellae of the olfactory organ (Fig.5A-B). The primary lamellae of the ol- factory organ are arranged at both sides (lateral and medial) of the axis i Stock Photo](https://c8.alamy.com/comp/RHDN98/bonner-zoologische-monographien-zoology-28-2-posterior-barbel-fig4a-b-the-posterior-barbel-of-couesius-is-a-papillate-appendage-derived-from-the-upper-rictal-tissue-which-is-not-homologous-with-the-barbels-of-other-quotbarbeled-cyprinids-ie-cyprinins-howes-1985-this-posterior-barbel-is-located-at-the-corner-of-the-mouth-and-present-in-couesius-only-fig4a-ts-2-a-posterior-barbel-absent-0-or-present-1-3-primary-lamellae-of-the-olfactory-organ-fig5a-b-the-primary-lamellae-of-the-ol-factory-organ-are-arranged-at-both-sides-lateral-and-medial-of-the-axis-i-RHDN98.jpg)
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. Bonner zoologische Monographien. Zoology. 28 2. Posterior barbel (Fig.4A-B). The posterior barbel of Couesius is a papillate appendage derived from the upper rictal tissue which is not homologous with the barbels of other "barbeled cyprinids, ? (i.e.. cyprinins) (Howes 1985). This posterior barbel is located at the corner of the mouth, and present in Couesius only (Fig.4A). - TS 2: A posterior barbel absent [0], or present [1]. 3. Primary lamellae of the olfactory organ (Fig.5A-B). The primary lamellae of the ol- factory organ are arranged at both sides (lateral and medial) of the axis in the olfactory. Fig.7: Supratemporal and otic canals (in black), frontal, pterotic. parietal, epioccipital. and supraoc- cipital bones in hemitremians and in the outgroup. A: Nocomis platyrhynchus (KU 18926. 46.5 mm SL); B: Semotilus corporalis (KU 18856, 58.0 mm SL): C: Couesius plumbeus (KU 18881, 56.6 mm SL). Scale bars = 1 mm.. 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 work.. Bonn, Zoologisches Forschungsinstitut und Museum Alexander Koenig