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.

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

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

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

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

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

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 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.

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

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.

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.

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

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

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.

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.

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.

They typically have spiny heads, and rounded pectoral and caudal fins.

* Compared to a wreckfish, its scales are much larger, the head outline and gill cover are smooth, and the caudal fin is rounded at the edges.

* The dorsal fin originates at the anterior of the caudal end of the operculum, the soft portion of the dorsal fin is more tall than long, the caudal fin is rounded and in adults it is an elongated upper ray, the anal fin originates below the soft portion of the dorsal fin, which it resembles in its rounded shape and being more tall than long.

Mosquitofish are small, dull grey, with a large abdomen, and have rounded dorsal and caudal fins and an upturned mouth towards the surface.

The caudal fin of the ocean sunfish is replaced by a rounded clavus, creating the body's distinct truncated shape.

Soft dorsal, anal and caudal ( tail ) fins are all large and rounded, and are dusky grey or black with distinct white edges.

It has a large mouth, a prominent bony ridge above each eye, a rounded caudal fin, and two lateral lines which overlap slightly.

Electric rays have a rounded pectoral disc with two moderately large rounded-angular ( not pointed or hooked ) dorsal fins ( reduced in some narkids ), and a stout, muscular tail with a well-developed caudal fin.

The caudal fins are more rounded than the tails of true muskies.

The single dorsal and ventral fins have spines and soft rays ; the paired pectoral and pelvic fins have soft rays only ; and the caudal fin has soft rays and is truncate and rounded.

The dorsal fin may or may not be continuous with the caudal fin, which is rounded.

The caudal peduncle is broad and the caudal fin is large, rounded, and sometimes tipped with black.

These fish are aptly named ; their rounded, compressed bodies are completely covered ( with the exception of the caudal peduncle ) with very large, strong platelike scales called scutes which are fortified with prominent ridges.

The form of the telson varies between the two genera: in Lepidurus, a rounded projection extends between the caudal rami, while in Triops there is no such projection.

The name " tripletail " is given because of the fish's three rounded fins: dorsal, caudal, and anal.

All fins are spinous ( excluding the low-slung pectoral fins ) and rounded: there is a single dorsal fin with 3 – 8 spines and 10 – 19 soft rays ; the pelvic fins are thoracic with one spine and 6 – 7 soft rays ; the anal fin has 2 – 3 spines and 8 – 12 soft rays ; and even the forked caudal fin possesses 4 – 7 procurrent spines on each lobe.

The caudal fin is rounded to concave.

The caudal fin, anal fin and soft dorsal fin are rounded.