spacer gif spacer gif spacer gif spacer gif spacer gif
QUICK SEARCH:   [advanced]


spacer gif
     Home     Help     Feedback     Subscriptions     Archive     Search     Table of Contents    

Right arrow Help viewing high resolution images
Right arrow Return to article
(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.



Fig. 8. Comparison of larvacean and vertebrate placodes. An Oikopleura early hatchling and a representative vertebrate embryo (24-hour zebrafish) are schematized in dorsal view to show the correspondence in topography between the larvacean ventral organ (VO) and vertebrate olfactory (OL) placodes (green), and between the ciliary funnel (CF) and adenohypophyseal (AD) placodes (yellow). The larvacean Langerhans (LA) and vertebrate otic (OT) placodes (blue) may also be orthologous, or they could have evolved independently from a common mechanosensory placode precursor. The larvacean ciliated circumoral mechanosensory organ (CO, orange), however, might be homologous to ascidian and cephalochordate oral mechanosensory systems, but might have no counterpart in modern vertebrates. FB, forebrain; HB, hindbrain; no, notochord; sc, spinal cord.





Right arrow Return to article