Ichthyological terms, not general ones.
Either of the pair of fins, also known as pelvic fins, attached to the pelvic girdle in fishes that help control the direction of movement. Correspond to the hind legs in higher vertebrates and vary in position depending on taxon. Sometimes absent entirely.
Used in 431 profiles
Located near or towards the rear end; further back in position.
Used in 396 profiles
Movement or orientation of an organism towards, into (positive rheotaxis) or away from (negative rheotaxis) a current of air or water
Meaning 'below distal'; often used to refer to the position of markings in the fins of fishes.
Used in 15 profiles
The hierarchical position of an organism within a food chain.
Either of the pair of fins, also known as pelvic fins, attached to the pelvic girdle in fishes that help control the direction of movement. Correspond to the hind legs in higher vertebrates and vary in position depending on taxon. Sometimes absent entirely.
Used in 74 profiles
Positioned or orientated between the ventral and lateral surfaces.
Used in 4 profiles