The caudal peduncle is absent and the caudal fin is reduced to a stiff rudder-like structure.

Ocelli on dorsal fin and caudal peduncle

The wild-caught forms of the species are typically darkly coloured with orange-ringed spots or ocelli on the caudal peduncle and on the dorsal fin.

: Once inside the skull, the visceral sensory fibers enter the lateral medulla between the olive and the inferior cerebellar peduncle and descend in the tractus solitarius to synapse in the caudal nucleus solitarius.

Other noticeable features are the black " eye spot " usually found high on the caudal peduncle, and the presence of a gular plate.

The spine ends at the caudal peduncle, distinguishing this group from those in which the spine extends into the upper lobe of the caudal fin.

The caudal peduncle is the narrow part of the fish's body to which the caudal or tail fin is attached.

* The caudal fin is the tail fin, located at the end of the caudal peduncle and is used for propulsion.

This is a lateral ridge on the caudal peduncle, usually composed of scutes ( see below ), that provides stability and support to the caudal fin.

* a projecting, modified ( rough and strongly ridged ) scale, usually associated with the lateral line, or on the caudal peduncle forming caudal keels, or along the ventral profile.

There is also sexual dimorphism in the species, with males being larger, having a deeper caudal peduncle and a pronounced hump behind the anus.

Its appearance is similar to that of other cod species ; generally heavy-bodied, elongate, usually with a stout caudal peduncle.

The caudal fin is moderately forked with its posterior edged double-curved and is set at the end of a stout peduncle.

The body is deep and laterally extremely compressed, somewhat resembling a hatchet ( with the thorax being the " blade " and the caudal peduncle being the " handle ").

Typified by large heads with large mouths and eyes, grenadiers have slender bodies that taper greatly to a very thin caudal peduncle or tail ( excluding one species, there is no tail fin ): this rat-like tail explains the common name rattail and the family name Macrouridae, from the Greek makros meaning " great " and oura meaning " tail ".

Some species also have recurved spines on the base of the tail ( caudal peduncle ).

Males have numerous long spines in front of the caudal peduncle, and females similarly have a toothbrush-like mass of setae in the same location.

These sharks are characterized by teeth in upper and lower jaws similar in size ; caudal peduncle with lateral keels ; upper precaudal pit usually present ; and a caudal fin without subterminal notch.

The telson is flanked by a pair of long, thin caudal rami.

The zebrafish is named for the five uniform, pigmented, horizontal, blue stripes on the side of the body, which are reminiscent of a zebra's stripes, and which extend to the end of the caudal fin.

In rodents, the EC is located at the caudal end of the temporal lobe.

The vaginal opening is at the caudal end of the vulva, behind the opening of the urethra.

Sexual dimorphism is slight, the male's caudal fin being more pointed.

The gills of other insects are tracheal, and also include both thin plates and tufted structures, and, in the larval dragon fly, the wall of the caudal end of the alimentary tract ( rectum ) is richly supplied with tracheae as a rectal gill.

At the posterior end, a hardened caudal shield is sometimes present in Aspidosiphon.

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

The tail is very nearly equally proportioned and is split by a terminal tuft of fin rays that make up the caudal lobe of the tail.

There is also an anal fin, which is also considered spiny, and a caudal fin.

Walleyes are distinguished from their close cousin the sauger by the white colouration on the lower lobe of the caudal fin which is absent on the sauger.

The caudal fin is strongly divided and rigid, with a slender, ridged, base.

The hypopharynx or laryngopharynx or ( Latin: pars laryngea pharyngis ) is the caudal part of the pharynx ; it is the part of the throat that connects to the esophagus.

Expression of this hairy-like bHLH transcription factor, which represses Neurogenin but is required for Ascl1, is progressively lost from the caudal thalamus but maintained in the prethalamus and in the stripe of rostral thalamic cells.

In terms of development, the human nervous system is often classified based on the original 3 primitive vesicles from which it develops: These primary vesicles form in the normal development of the neural tube of the human fetus and initially include prosencephalon, mesencephalon, and rhombencephalon, in rostral to caudal ( from head to toe ) orientation.

It is suspended by the caudal part of the mesentery ( mesoileum ) and is attached, in addition, to the cecum by the ileocecal fold.

Hominoids have more mobile shoulder joints and arms due to the dorsal position of the scapula, broad ribcages that are flatter front-to-back, and a shorter, less mobile spine compared to Old World monkeys, with caudal ( tail ) vertebrae greatly reduced, resulting in complete tail loss in living species.

The entire rear margin of the caudal fin has a distinctive, broad, black band.

They have a broad head, an elongated body with an extended bifurcate caudal fin, a long anal fin, large pectorial fins and a rudder-like caudal fin.

The caudal fin is broad, with the lower lobe almost as large as the upper, which has a prominent ventral notch.

A small shark usually not exceeding in length, this species is easily recognizable by its slender body and short but broad head, as well as tubular skin flaps beside the nostrils, oval eyes with vertical pupils, and white-tipped dorsal and caudal fins.

The main features of the fish, the fins, are bony fin rays and, except the caudal fin, have no direct connection with the spine.

An additional caudal fin covers the post-anal tail.

alt = Drawing of a shark labeling major anatomical features, including mouth, snout, nostril, eye, spiracle, dorsal fin spine, caudal keel, clasper, labial furrows, gill openings, precaudal pit and fins: first and second dorsal, anal, pectoral, caudal and pelvic

By contrast, most bony fish possess a homocercal caudal fin.

Coelacanths (, adaptation of Modern Latin Cœlacanthus " hollow spine ", from Greek κοῖλ-ος koilos " hollow " + ἄκανθ-α akantha " spine ", referring to the hollow caudal fin rays of the first fossil specimen described and named by Louis Agassiz in 1839 ) are members of an order of fish that includes the oldest known living lineage of Sarcopterygii ( lobe-finned fish and tetrapods ).

They possess a three-lobed caudal fin, also called a trilobate fin.

Coelacanths have 8 fins – 2 dorsal fins, 2 pectoral fins, 2 pelvic fins, 1 anal fin, and 1 caudal fin.

The lobes of the caudal ( tail ) fin in muskellunge come to a sharper point, while those of northern pike are more generally rounded.

In addition, the two dorsals and the caudal fin of the sauger are marked with distinctive rows of black dots which are absent from or indistinct on the same fins of walleyes.

Drums are somberly colored, usually in shades of brown, with a lateral line that extends to the tip of the caudal fin.

Most species have a rounded or pointed caudal fin.