. Bonner zoologische Monographien. Zoology. « 87 mx. Fig. 39: Relationships among palatine, maxilla and antorbital. — A: Nematogenys inermis (LBUCH 30873); B: Heptapterus mustelinus (KU 21135); C: Trichomycterus oroyae (NMNH 16786). : articular facet for lateral ethmoid-orbitosphenoid complex; : articular facet for vomer; an: antorbital; iol: first infraorbital; met: mesethmoid; mx: maxillary; mxb: maxilla barbel and its support; na: nasal; pa: palatine; pmx: premaxilla. 1969, Arratia 1982 a, 1983 c). "A separate, well developed ural centrum occurs in some members of four spec
. Bonner zoologische Monographien. Zoology. « 87 mx. Fig. 39: Relationships among palatine, maxilla and antorbital. — A: Nematogenys inermis (LBUCH 30873); B: Heptapterus mustelinus (KU 21135); C: Trichomycterus oroyae (NMNH 16786). : articular facet for lateral ethmoid-orbitosphenoid complex; : articular facet for vomer; an: antorbital; iol: first infraorbital; met: mesethmoid; mx: maxillary; mxb: maxilla barbel and its support; na: nasal; pa: palatine; pmx: premaxilla. 1969, Arratia 1982 a, 1983 c). "A separate, well developed ural centrum occurs in some members of four specialized and unrelated families. This is interpreted as independent redevelopment of a presumedly primitive pre-ostariophysan condition" (Lundberg & Baskin 1969: 46). Recently, Patterson (1984) described a separate second ural centrum in the fossil otophysan Chanoides. I interpret the presence of a separate second ural centrum in young and its loss in adult diplomystids as an advanced condition apparently unique to Diplomystidae. Rows of maxillary teeth: The presence of a dentate maxilla is primitive within Siluroidei, one functional row of maxillary teeth can be found in characid ostariophysans. Maxillary teeth are apparently present in the Eocene siluroid. 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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