. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. Figure 2. Gross morphology of the pharyngeal jaws, teeth, and associated structures of the largemouth bass. (A) Drawing of the fully distended pharynx and tongue; other parts of the oral cavity are not shown. The structure was opened dorsoventrally to provide a flattened configuration. Details of the dentition on the pharyngeal pads and gill arches are shown on the left half of the figure. Upper (dorsal) pharyngeal pads(UPl-3)and the gill arches (GA I-IV) are numbered in an anterior to posterior direction. ES, esophagus; GF,
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. Figure 2. Gross morphology of the pharyngeal jaws, teeth, and associated structures of the largemouth bass. (A) Drawing of the fully distended pharynx and tongue; other parts of the oral cavity are not shown. The structure was opened dorsoventrally to provide a flattened configuration. Details of the dentition on the pharyngeal pads and gill arches are shown on the left half of the figure. Upper (dorsal) pharyngeal pads(UPl-3)and the gill arches (GA I-IV) are numbered in an anterior to posterior direction. ES, esophagus; GF, gill filaments; GR. gill rakers; LP, lower pharyngeal pad. (B) Curved caniform teeth on upper pharyn- geal pad, UP2. (C) Straight caniform teeth on medial portion of a lower pharyngeal pad. In panel A, the lines to UP2 and LP terminate in the approximate regions of teeth shown in B and C. form teeth on the medial half (Fig. 2C) and curved teeth situated toward the periphery, and generally pointed to- ward the esophagus. Co-location of pharyngeal teeth and taste buds Scanning electron microscopy (SEM) showed that taste buds are abundant around and between most teeth of both the upper and lower pharyngeal jaws. Taste buds com- pletely encircle many teeth (Fig. 3B, C). Many taste buds are situated atop distinct mounds or papillae (Fig. 3B- D), whereas others have a flattened surface profile. The relative proportion of the two types of taste buds was not determined because some of the flat buds were difficult to distinguish from other surface structures or debris. Higher magnification SEM showed that each taste bud also had a distinct receptor area, and microplicae (elevated ridges) on the surrounding epithelium (Fig. 3D): these features have been observed in other fish species (, Reutter el ai., 1974). Histological sections verified the existence of taste buds with an elevated surface profile and a flattened profile (Fig. 4); but no further features that might distinguish the
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
