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The dorsal and anal fins are divided into anterior spiny and posterior soft-rayed portions, which may be partially or completely separated.
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dorsal and anal
It moves by combining pectoral, dorsal, anal, and caudal fins.
Because of this, they are slow-moving and rely on their pectoral, dorsal, anal, and caudal fins for propulsion rather than by body undulation.
However, movement is usually quite precise ; dorsal and anal fins aid in manoeuvring and stabilizing.
The Molidae are conspicuous even within this oddball order: they lack swim bladders and spines, and are propelled by their very tall dorsal and anal fins.
In Aspidosiphon and Lithacrosiphon the anal shield is restricted to the dorsal side, causing the introvert to emerge at an angle, whereas it surrounds the anterior trunk in Cloeosiphon with the introvert emerging from its center.
The expression of bmp2 / 4 begins at the onset of gastrulation on the ectodermal side of the embryo, and as grastulation progresses its expression is narrowed down to the dorsal midline but is not expressed in 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
Coelacanths have 8 fins – 2 dorsal fins, 2 pectoral fins, 2 pelvic fins, 1 anal fin, and 1 caudal fin.
Like other pikes, the body plan is typical of ambush predators with an elongated body, flat head and dorsal, pelvic and anal fins set far back on the body.
The first dorsal and anal fins are spinous, as is the operculum.
They are generally medium sized fish, and are distinguished by the presence of three dorsal fins on the back and two anal fins on the underside.
The anal fin usually has two spines while the dorsal fins are deeply notched or separate.
Scombrids have two dorsal fins, and a series of finlets behind the rear dorsal fin and anal fin.
The pikes tend to be lie-in-wait, ambush predators, with elongated snouts, long, well-muscled torsos, forked tails, and dorsal and anal fins set well back and opposite each other for rapid acceleration along a straight line, allowing the fish to quickly emerge from cover to capture their prey.
Their venomous spines are on both dorsal fins, the pectoral fins, pelvic fins, anal fins, and several on the gill cover.
Heterodontiforms have 2 dorsal fins, with fin spines, as well as an anal fin.
The dorsal and anal fin also contain basal cartilages, not just fin rays.
Before striking they bend their body and dash out to the prey using the large surface of tail fin, dorsal fin and anal fin to propel themselves.
They have no scutes and soft dorsal bases less than twice the length of the anal fin bases.
It has a disk-shaped body, and propels itself with its long, thin dorsal and anal fins ; it feeds primarily on jellyfish.
Many species of marine angelfishes have streamer-like extensions of the soft dorsal and anal fins.
The anal fin is low and almost as long as the dorsal fin.
dorsal and fins
In aquatic salamanders and in frog tadpoles, the tail has dorsal and ventral fins and is moved from side to side as a means of propulsion.
At hatching, a typical salamander larva has eyes without lids, teeth in both upper and lower jaws, three pairs of feathery external gills and a long, somewhat laterally flattened body and tail with dorsal and ventral fins.
The pectoral fins are movable and used in maneuvering ; the dorsal fin is fixed and contributes stability, and the tail is used for propulsion, as well as maneuvering.
Swimming water animals such as fish and cetaceans actively use pectoral fins for maneuvering, and dorsal fins contribute stability as the animal swims, propelling and maneuvering with its tail, itself recognizable as a fin.
These alterations included the removal of his tiny ears, 3 toes on each foot rather than four, enlarged central dorsal fins and a bulkier body.
Catfish are responsible for over 4 % of Jamaican inhabitants ' deaths due to the deadly venom found on the tips of their dorsal and pectoral fins.
Female transients are characterized by more triangular and pointed dorsal fins than those of residents.
However, because of the large, scarred and nicked dorsal fins resembling those of mammal-hunting transients, they may also eat mammals and sharks.
Four dorsal fins are visible, three of which curve backward at the tip.
He was so impressed by her and her friend Elizabeth Philpot that he wrote in his journal: " Miss Philpot and Mary Anning have been able to show me with utter certainty which are the icthyodorulites dorsal fins of sharks that correspond to different types.
It has a number of lateral projections that look like dorsal fins, but turned the incorrect way.
There are two dorsal fins, the first one spiny and the second soft.
The spiny first dorsal fin is normally folded back in a groove, as are its pectoral fins.
dorsal and are
Other researchers have suggested, based on a cladistic analyses of dorsal exoskeletal features, that Eodiscina and Agnostida are closely united, and that the Eodiscina descended from the trilobite order Ptychopariida.
The three sepals are generally colourful and bright ( which is why they are sometimes called outer tepals ), with one on each side (" lateral sepals ") and one usually at the top of the flower (" dorsal sepal "), sometimes forming a hood.
Chordates, members of the phylum Chordata, are deuterostome animals possessing a notochord, a hollow dorsal nerve cord, pharyngeal slits, an endostyle, and a post-anal tail for at least some period of their life cycles.
In all craniates except for hagfish, the dorsal hollow nerve cord is surrounded with cartilaginous or bony vertebrae and the notochord is generally reduced ; hence, hagfish are not universally regarded as vertebrates, though recent DNA comparisons suggest that they are in fact vertebrates.
The plantar interossei adducts and the dorsal interossei abducts these digits and are also plantar flexors at the metatarsophalangeal joints.
The giraffe's head and neck are held up by large muscles and a nuchal ligament, which are anchored by long dorsal spines on the anterior thoracic vertebrae, giving the animal a hump.
Individual whales are typically identified using photographs of their dorsal surface and matching the scars and patches associated with parasites that have fallen off the whale or are still attached.
The gray whale also lacks a dorsal fin, instead bearing 6 to 12 dorsal crenulations (" knuckles "), which are raised bumps on the midline of its rear quarter, leading to the flukes.
These claims are contradicted by experimental data and fail to explain evidence in the Luneau video of white dorsal plumage, distinctive flight behavior, and a perched woodpecker with white upper parts.
Offshores appear to be smaller than the others, and females are characterized by dorsal fin tips that are continuously rounded.
Most of the dark parts of its body are medium gray instead of black, although it has a dark gray patch called a " dorsal cape " stretching back from its forehead to just behind its dorsal fin.
Variations such as nicks, scratches, and tears on the dorsal fin and the pattern of white or grey in the saddle patch are unique.
All nociceptors are free nerve endings that have their cell bodies outside the spinal column in the dorsal root ganglia and are named according to their appearance at their sensory ends.
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