(Downloading may take up to 30 seconds.
If the slide opens in your browser, select File -> Save As to save it.)
Click on image to view larger version.


Figure 1


Fig. 1. An oral view of O. bimaculoides in a vertical hanging position. The buccal mass is located in a sinus formed by the base of the arms and includes an upper (blue) and lower (red) chitinous beak embedded in the mandibular muscles. Also shown are the esophagus and the buccal membrane lips, a ring of tissue that seals the sinus and covers the beaks.