. Bonner zoologische Monographien. Zoology. 90. Fig. 40: Cartilaginous support of barbels and associated bones. — A: Plecostomus sp. (KU 21135); B: Trichomycterus roigi (according to Arratia & Menu Marque 1984); C: Callichthys callichthys (KU 13722); D: Cetopsorhamdia sp. (ANSP 13890). d: dentary; db: dental barbel and its (?)cartilaginous support; meb: mental barbel and its (?)car- tilaginous support; met: mesethmoid; mx: maxilla; mxb: maxillary barbel and its (?)cartilaginous support; na: nasal; nab: nasal barbel and its (?)cartilaginous support; pa: palatine; pmx: premax- illa; smb: sub
. Bonner zoologische Monographien. Zoology. 90. Fig. 40: Cartilaginous support of barbels and associated bones. — A: Plecostomus sp. (KU 21135); B: Trichomycterus roigi (according to Arratia & Menu Marque 1984); C: Callichthys callichthys (KU 13722); D: Cetopsorhamdia sp. (ANSP 13890). d: dentary; db: dental barbel and its (?)cartilaginous support; meb: mental barbel and its (?)car- tilaginous support; met: mesethmoid; mx: maxilla; mxb: maxillary barbel and its (?)cartilaginous support; na: nasal; nab: nasal barbel and its (?)cartilaginous support; pa: palatine; pmx: premax- illa; smb: submaxillary barbel and its (?)cartilaginous support. Diplomystidae. The supporting system of the maxillary barbel in diplomystids (contra Ghiot & Bouchez 1980) and other catfishes is a small plate placed ventroposteriorly to the maxilla (Fig. 40A, B). Siluroids with three or four pairs of barbels have a large plate supporting the barbel (Fig. 40B—D) (Howes 1983 b, Arratia & Menu Marque 1984). The central rod of the barbel has been assigned as cartilage at least for some catfishes (e. g. Pollard 1895, Baecker 1926, Nagar & Mathur 1959, Reutter 1978), as "infantile fibrous cartilage" changing into precartilage in Silurus glanis (Hoffmann 1923), as chondroid supporting tissue (with hyaline cells = cartilage-like tissue) for Silurus glanis (Schaffer 1930) and as a elastin net surrounded by longitudinal fibers of collagen in Pimelodus clahas (Ghiot & Bouchez 1980). Information about many famihes is missing and the actual information is variable as Pollard (1895: 416) noted: "In Siluroids much more complicated differentiations have arisen. The tentacles are not of similar histological nature in different families".. 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, Zoologi
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Keywords: ., bookcentury1900, bookcollectionbiodiversity, booksubjectzoology
