. Bonner zoologische Monographien. Zoology. 65. : Autopalatine and surrounding bones, ventral view. — A: Parapimelodus valenciennesi (175 mm standard length; KU 21804); B: Bagre marinus ( mm standard length; KU 3053). A,B same scale, apa: autopalatine; : cartilage joining lateral ethmoid, vomer, and mesethmoid; cr: crest; Ectl: 'ec- topterygoid' type 1; Ent5-6: 'entopterygoid' types 5-6; met: mesethmoid; mtg: metapterygoid; mtg+Tp: dermo + metapterygoid; Mx: maxilla; Par: parasphenoid; Pmx: premaxilla; V: vomer; Vtp: vomerine toothplate. In both small and large specimens,
. Bonner zoologische Monographien. Zoology. 65. : Autopalatine and surrounding bones, ventral view. — A: Parapimelodus valenciennesi (175 mm standard length; KU 21804); B: Bagre marinus ( mm standard length; KU 3053). A,B same scale, apa: autopalatine; : cartilage joining lateral ethmoid, vomer, and mesethmoid; cr: crest; Ectl: 'ec- topterygoid' type 1; Ent5-6: 'entopterygoid' types 5-6; met: mesethmoid; mtg: metapterygoid; mtg+Tp: dermo + metapterygoid; Mx: maxilla; Par: parasphenoid; Pmx: premaxilla; V: vomer; Vtp: vomerine toothplate. In both small and large specimens, an elongate 'ectopterygoid' type 1 (Figs. 35A—C, 36A) lies ventral to the autopalatine. It is sharp anteriorly and curves posteromedially. Its posterior end is hgamentously attached to 'entopterygoid' type 5. Anteriorly, the elongate autopalatine has a large nodule of fibrocartilage in adults. The small articular facets of the maxilla articulate with this fibrocartilage, which also abuts a cavity in the dorsal aspect of the premaxilla. Medially, the autopalatine articulates via cartilage with the lateral ethmoid. This cartilage reaches the mesethmoid but not the vomer in large individuals (Fig. 36A). The 'ectopterygoid' type 1 is joined anteriorly by a short ligament to the autopalatine, and posteriorly to the 'entopterygoid' type 5. The 'entopterygoid' type 5 is also con- nected by short ligaments to the 'ectopterygoid' type 1, the dermo + metapterygoid, and lateral ethmoid. There is no ligament between the autopalatine and dermo + metaptery- goid. A strong ligament extends from the ectopterygoid process of the metapterygoid to the maxilla, but a ligamentous link between metapterygoid and vomer is absent. A ligament extends from the posterior part of the autopalatine to the posterior part of the orbitosphenoid. There is no link between the metapterygoid-maxillary ligament and the ligamentum primordiale that extends from the coronoid cartilage of the lower jaw to the premax
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Keywords: ., bookcentury1900, bookcollectionbiodiversity, booksubjectzoology
