The genus name is derived from the Ancient Greek, kryptos ( hidden ) and branchos ( gill ); a reference to oxygen absorption primarily through gills that are in a covered chamber and not lungs.

They young brood in the female's gill chamber.

Hagfish generally respire through taking in water through their pharynx, past the velar chamber and bringing the water through 6 internal gill pouches.

The water enters the mouth and pharynx, flows through mucus-covered gill slits ( also called pharyngeal stigmata ) into a water chamber called the atrium, then exits through the atrial siphon.

As decapods ( meaning ten-legged ), anomurans have ten pereiopods, but the last pair of these is reduced in size, and often hidden inside the gill chamber ( under the carapace ) to be used for cleaning the gills.

The time required to engorge itself with blood and leave the host ’ s gill chamber ranges from 30 – 145 seconds.

The defining characteristic of all galeaspids was a large opening on the dorsal surface of the head shield, which was connected to the pharynx and gill chamber.

Each pint was divided into four gills or twenty fluid ounces, that is, five ounces for each gill.

With the evolution of the jaw in the early jawed vertebrates, this gill slit was " caught " between the forward gill-rod ( now functioning as the jaw ) and the next rod, the hyomandibular bone, supporting the jaw hinge and anchoring the jaw to the skull proper.

The gill opening was closed off from below, the remaining opening was small and hole-like, and is termed a " spiracle ".

Paleontologists suggest that its giant size was an adaptation for life in the murky bottom waters, where a correspondingly large gill area would have allowed the animal to cope with oxygen-depleted waters.

Kandel and colleagues used preparations of Aplysia californica where individuals were restrained in small aquariums in a manner that the gill was exposed.

A tactile stimulus was administered to the siphon and elicited the gill and siphon withdrawal reflex.

A photocell was placed under the gill to record amplitude and duration of the response elicited by the stimulus.

The gill net, called tuwátifshi, was 40 to 60 feet long and was weighted with stones to sink it.

One of his major discoveries was the homology of the opercular plates of the gill cover of fishes with the inner ear ossicles of mammals.

The Australian salmon fetch no more than a few dollars ( AU ) per kilogram ; nonetheless, large numbers are taken via purse seine nets ( and to a lesser extent trawling, hauling, gill, and trap nets ) annually ; the reported 2002 – 2003 commercial New Zealand catch of kahawai was 2, 900 tonnes.

Upon her husband's accession to the peerage, she became known as Dame Robert Carey, and is said to be the " Old Dame Dob " referred to in the Jack and Jill nursery rhyme, for her ministrations to the " bruised " King Charles I after his plan to raise revenue by lowering the volume of liquid in the jack ( 1 / 2 pint ) and gill ( 1 / 4 pint ) was foiled by publicans by simply making up the difference ( up to the 1 / 2 pint line that is marked by a crown on pint glasses ) with water.

He was the first to describe the gill slits and gill arches in the embryos of mammals and birds.

The deepwater cisco was distinguished by usually having fewer than 33 gill rakers, relatively long pectoral fins, and unpigmented jaws.

The mouth opens posteriorly into a pharynx with a row of gill slits along either side.

Their gills are never covered by gill sacs and are reabsorbed just before the animals leave the water.

Newts ' gills are never covered by a gill sac and will be resorbed only just before the animal leaves the water.

Each gill is supported by a cartilagenous or bony gill arch.

Adjacent slits are separated by a cartilaginous gill arch from which projects a long sheet-like septum, partly supported by a further piece of cartilage called the gill ray.

This bears a small pseudobranch that resembles a gill in structure, but only receives blood already oxygenated by the true gills.

The remaining slits are covered by an operculum, developed from the septum of the gill arch in front of the first gill.

The gill arches of bony fish typically have no septum, so that the gills alone project from the arch, supported by individual gill rays.

Sharks are a group of fish characterized by a cartilaginous skeleton, five to seven gill slits on the sides of the head, and pectoral fins that are not fused to the head.

The remainder of this book is Ojo's quest through Oz to retrieve the five components of an antidote to the Liquid: a six-leaved clover found only in the Emerald City, three hairs from the tip of a Woozy's tail, a gill ( a quarter of a pint ) of water from a dark well ( one that remains untouched by natural light ), a drop of oil from a live man's body, and the left wing of a yellow butterfly.

Image: UrchinTestClose. jpg | Closeup of a sea urchin test: In life, a tube foot or gill extends through each of the small holes, and a spine is supported by each of the raised tubercles.

It has been observed that most of the known predators of hagfish are varieties of birds or mammals ; it has been proposed that the lack of marine predators can be explained by a " gill-clogging hypothesis ", wherein one purpose of the slime is to impair the gill function of marine animals that attempt to prey on the hagfish.

Marine angelfish are distinguished from butterflyfish by the presence of strong preopercle spines ( part of the gill covers ) in the former.

In addition to the absence of jaws, modern agnathans are characterised by absence of paired fins ; the presence of a notochord both in larvae and adults ; and seven or more paired gill pouches.

It is believed that the jaws evolved from anterior gill support arches that had acquired a new role, being modified to pump water over the gills by opening and closing the mouth more effectively — the buccal pump mechanism.

Members of this order are characterized by the presence of a nictitating membrane over the eyes, two dorsal fins, an anal fin, and five gill slits.

The underside of the gumboot chiton, Cryptochiton stelleri, showing the foot in the center, surrounded by the gill s and mantle ( mollusc ) | mantle.

The primary method of feeding is by suction, during which their rakers interlock to close the gill slits.

Deoxygenated arterial blood is brought to the lungs by paired pulmonary arteries which branch from the fourth efferent branchial arteries ( artery from the fourth gill arch ), and oxygenated blood leaves the lung in pulmonary veins.

The gill rakers are stout.

In fish, the homologous bone is called the hyomandibular, and is part of the gill arch supporting either the spiracle or the jaw, depending on species.

The hyoid bone is derived from the lower half of the second gill arch in fish, which separates the first gill slit from the spiracle, and is often referred to as the hyoid arch.