. Bonner zoologische Monographien. Zoology. 107. c Fig. 46: Pectoral spine (distal tip). — A: Ictalurus punctatus (KU 9657); B: Noturus flavus (KU 2539); C: Nematogenys inermis (LBUCH 30873). superficially appears toothless, but microscopic examination of the ventral view of the spine of the largest specimens reveals many small teeth which may not emerge from the skin. Pelvic girdle and splint: The pelvic girdle (Fig. 31; 37B) of young specimens of Olivaichthys viedmensis and most specimens of young and adult Diplomystes camposensis n. sp. have three anterior processes; two of them fuse or par
. Bonner zoologische Monographien. Zoology. 107. c Fig. 46: Pectoral spine (distal tip). — A: Ictalurus punctatus (KU 9657); B: Noturus flavus (KU 2539); C: Nematogenys inermis (LBUCH 30873). superficially appears toothless, but microscopic examination of the ventral view of the spine of the largest specimens reveals many small teeth which may not emerge from the skin. Pelvic girdle and splint: The pelvic girdle (Fig. 31; 37B) of young specimens of Olivaichthys viedmensis and most specimens of young and adult Diplomystes camposensis n. sp. have three anterior processes; two of them fuse or par- tially fuse in larger Olivaichthys n. gen., and Diplomystes chilensis and D. nahuelbu- taensis. Three anterior processes in the pelvic girdle is a feature found in Siluridae (Shelden 1937, Tilak 1967); most catfishes have two anterior processes in the pelvic gir- dle, and callichthyids seem to have a single process anteriorly (Hoedeman 1960 b: Fig. 13b—c). The early ontogenetic stage with three anterior separate processes is inter- preted here as primitive. Diplomystids have a small pelvic splint which is also found in other catfishes (see for instance Shelden 1937, Arratia et al. 1978, Howes 1983 a). According to Howes (1983 a: 336), "a pelvic sphnt is recorded only in the Trichomycteridae, Astroblepidae, Loricariidae and Diplomystidae". This statement is not completely correct because a pelvic sphnt is also present in Callichthyidae and Schilbeidae. The pelvic sphnt was con- sidered as a "rudimentary spine" by Howes (1983: 337), in contrast, the pelvic sphnt. 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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