heterocercal

The caudal fin is a single lobe, though heterocercal.

Their caudal fins are reverse heterocercal, with the lower lobe larger than the upper.

One of the primary characteristics present in most sharks is the heterocercal tail, which aids in locomotion.

Their tails are heterocercal, and the dorsal fins are close to the tail.

This so called heterocercal tail is only known to exist, as a permanent adult feature, in the sturgeons of to-day.

The caudal fin has asymmetrical lobes, forming a heterocercal tail.

Correspondingly, these fish also have a heterocercal fin which provides the necessary lift needed due to the lack of swim bladders.

The tail is heterocercal.

Endeiolepis it had strongly heterocercal tail.

Heterocercal if the vertebrae extend into the upper lobe of the tail, making it longer (as in sharks)

When alive, it would have had a superficial resemblance to a very small porgie, or sea bream, but with a heterocercal tail fin.

In sharks, the heterocercal tail shape drives water downward, creating a counteracting upward force while thrusting the shark forward.

Most sharks have heterocercal caudal fins, meaning that the backbone extends into the (usually longer) upper lobe.

Most Palaeozoic fishes had a diphycercal heterocercal tail.)

Sharks possess a heterocercal caudal fin in which the dorsal portion is usually noticeably larger than the ventral portion.

Additional shared features include spiracles and, in sturgeons, a heterocercal tail (the vertebrae extend into the larger lobe of the caudal fin).

Externally the cephalaspid body, like that of primitive gnathostomes, shows a heterocercal tail and paired fins (only pectoral fins are developed in cephalaspids).

Like the shovelnose sturgeon, their tails are heterocercal, with the top tail fin being longer than the bottom fin, though this is more pronounced in pallid sturgeon.

In gars, the tail is still heterocercal but less so than in the chondrosteans; bowfins have many rayed dorsal fins and can breathe air like the bichirs.

The common smooth-hound has two dorsal fins, an anal fin, a pair of pectoral fins, a pair of pelvic fins and a heterocercal tail.

The sturgeons themselves are not ancestral to modern bony fishes but are a highly specialized and successful offshoot of ancestral chondrosteans, retaining such ancestral features as a heterocercal tail, fin structure, jaw structure, and spiracle.

These fish are not closely related to sharks, which are in a different taxonomic class, but they do have some body parts that resemble those of sharks such as their skeletons, primarily composed of cartilage, and their deeply forked heterocercal tail fins.

Their paired pectoral fins combined with single, usually well-developed, dorsal and anal fins; these and the prolonged anterior tube-like handle, followed by a heterocercal tail resemble features of modern fish that associated with their deftness at predation and evasion.