. Breviora. 1971 BRAZILIAN CHARACIN FISH antorbjtal nasa vomer ethmoid parietal epiphyseal bar lateral ethmoid frontal sphenotic epiotic. exoccipital supraoccipital premaxillary infraorbital 6 Dterotic Figure 2. Cranium of Micromischodiis siigillatiis (dorsal view), osteological figures based on 125-mm specimen from MZUSP 8870. All dilator groove marked by a concavity in dorsolateral margin of frontal bone; sphenotic spine lamellar, rounded at tip. Ethmoid separated from vomer by a cartilaginous septum (in- dicated by heavy stippling in Figure 3). Vomer with peculiar anterior knoblike processe
. Breviora. 1971 BRAZILIAN CHARACIN FISH antorbjtal nasa vomer ethmoid parietal epiphyseal bar lateral ethmoid frontal sphenotic epiotic. exoccipital supraoccipital premaxillary infraorbital 6 Dterotic Figure 2. Cranium of Micromischodiis siigillatiis (dorsal view), osteological figures based on 125-mm specimen from MZUSP 8870. All dilator groove marked by a concavity in dorsolateral margin of frontal bone; sphenotic spine lamellar, rounded at tip. Ethmoid separated from vomer by a cartilaginous septum (in- dicated by heavy stippling in Figure 3). Vomer with peculiar anterior knoblike processes on either side. Lateral ethmoid rela- tively large, with elongate, strutlike process articulating with knob- hke process of vomer (Figs. 3 and 4) and a small median projec- tion firmly articulated to antero-ventral comer of rhinosphenoid. Rhinosphenoid large, sharing strongly interdigitating sutures with antero-ventral projection of orbitosphenoid (Fig. 3). Cartilaginous septum between dorsal edge of rhinosphenoid and roof of cranium and another between ventral margin of rhinosphenoid and para- sphenoid (cartilage indicated by heavy stippling in Figure 3). Rhinosphenoid and orbitosphenoid not directly contacting para- sphenoid. Parasphenoid deeply cleft posteriorly, the thin divisions thus formed cleft at their tips (Fig. 4; compare with Weitzman, 1962, fig. 4 of Brycon on p. 60; and Roberts, 1969, fig. 20 of Acestrorhynchus on p. 463). Intercalar well developed. Pterotic with strong posteriorly directed spine. Jaws and jaw suspension (Figs. 2, 5-7). The size and shape of the jaw bones and their relationships to each other are similar. 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 Harvard University. Museum of Comparative Zoology. Cambridge, Mass. , Museum of Comparative Zoology, Harvard University
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