. Bonner zoologische Monographien. Zoology. 40 The hyomandibula is a broad bone, with a long articular facet covered with cartilage and articulating with the sphenotic and pterotic. A small, short, sharp, membranous outgrowth extends anteriorly. Posteriorly, there is an elongate, massive opercular pro- cess and an elongate sutural surface at the posterolateral margin of the hyomandibula, below the opercular process. A small levator arcus palatini crest is present close to the posterior margin of the bone. A single foramen for both the entrance and exit of the facial nerve pierces the bone, clo
. Bonner zoologische Monographien. Zoology. 40 The hyomandibula is a broad bone, with a long articular facet covered with cartilage and articulating with the sphenotic and pterotic. A small, short, sharp, membranous outgrowth extends anteriorly. Posteriorly, there is an elongate, massive opercular pro- cess and an elongate sutural surface at the posterolateral margin of the hyomandibula, below the opercular process. A small levator arcus palatini crest is present close to the posterior margin of the bone. A single foramen for both the entrance and exit of the facial nerve pierces the bone, close to the anterodorsal corner of the hyomandibula. In a 28 mm specimen of D. camposensis, there is a large bone (Fig. 16B) on both sides of the body between the hyomandibula, quadrate, and metapterygoid and it was iden- tified as ?metapterygoid by Arratia (1987a: 54, Fig. 25A). Based on my more recent. : Elements of the Suspensorium and maxilla in diplomystids. — A: Autopalatine and surrounding bones in Diplomystes camposensis, dorsal view (after Arratia 1987a); B: Anterior part of maxilla in D. nahuelbutaensis (CAS-SU 55425); C: Metapterygoid in D. nahuelbutaensis, lateral view (CAS-SU 55425). Arrow points to a notch. : articular facet for lateral ethmoid; : articular surface for hyomandibula; apa: autopalatine; : ar- ticular process of maxilla; : articular surface for quadrate; : articular facet for vomer; ; lateral ar- ticular facet for autopalatine; : medial articular facet for autopalatine; Mx: maxilla; Pmx: premaxilla; pr. b: processus basalis; ; processus ectopterygoideus; Vtp: vomerine 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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