pelvic fins

The pelvic fins are paired fins found on the ventral (bottom) side of fish.  In teleost (bony) fishes, pelvic fins placement gives some indication of evolution.  For more basal groups, the pelvic fins are located at mid-body in the abdominal region.  For more derived fishes, the pelvic fins are located in a thoracic or even … [Read more…]