Gill slits are individual openings to gills, i.e., multiple gill arches, which lack a single outer cover. Such gills are characteristic of cartilaginous...

vertebrates typically develop in the walls of the pharynx, along a series of gill slits opening to the exterior. Most species employ a counter-current exchange...

pharyngeal slits. It is postulated that this is how pharyngeal slits first assisted in filter-feeding, and later, with the addition of gills along their...

delicate gills. A smaller opening, the spiracle, lies in the back of the first gill slit. This bears a small pseudobranch that resembles a gill in structure...

slot-like body openings called gill slits that lead from the gills, but the Hexatrygonidae have six. Batoid gill slits lie under the pectoral fins on...

to the environment, rather than set inside the pharynx and covered by gill slits, as they are in most fishes. Instead, the respiratory organs are set on...

through a series of gill slits that perforate the body wall. Without the operculum bone, other methods of getting water to the gills are required, such...

vertebrates breathe with gills, which are carried right behind the head, bordering the posterior margins of a series of openings (gill slits) from the pharynx...

potentially damaging passage of solid material through the gill slits and over the gill filaments, early gill rakers strained large particles from the water and...

circulatory system 8 = atriopore 9 = space above pharynx 10 = pharyngeal slit (gill) 11 = pharynx 12 = vestibule 13 = oral cirri 14 = mouth opening 15 = gonads...

about twice the head length. In general, three external gills are inserted posterior to the gill slits and above the pectoral fins. It has cycloid scales embedded...

elasmobranch 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...

fish and many fish in oxygen-poor water use other methods, such as their gills or their skin to breathe air. Amphibious fish may also have eyes adapted...

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...

chordate to move in water. The endostyle is underneath the pharyngeal gill slits where proteins are trapped to eventually provide the chordate energy and...

Cleithrum Chromatophore Fins dorsal fin Gill branchial arch gill raker gill slit pharyngeal arch pharyngeal slit pseudobranch Glossohyal Jaw hyomandibula...

through the inhalant buccal siphon by the action of cilia lining the gill slits. The filtered water is then expelled through a separate exhalant siphon...

vertebrates typically develop in the walls of the pharynx, along a series of gill slits opening to the exterior. Most species employ a countercurrent exchange...

limbs. They also evolved a pair of opercula (gill covers), which can actively draw water across the gills so they can breathe without having to swim. Bony...

Hexanchidae. It is recognizable because of its seven gill slits, while most shark species have five gill slits, with the exception of the members of the order...

increase surface area for gas exchange. Four-gill slits lined with gill rakers are hidden underneath the external gills, which prevent food from entering and...

superficially similar to those of lobe-finned fishes. They also have a pair of slit-like spiracles on the top of their heads that are used to breathe air, two...

psammophilus has just a single gill slit. The gills in some acorn worms have cartilaginous support structures. Each slit consists of a branchial chamber...

with gill remnants still present, short lived and only leaves behind a gill slit. For species with scales under their skin, the scales does not form before...

Cleithrum Chromatophore Fins dorsal fin Gill branchial arch gill raker gill slit pharyngeal arch pharyngeal slit pseudobranch Glossohyal Jaw hyomandibula...

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 called the hyoid...

ventromedial valve of the gill slit, keeping the gills moist, and allowing them to function while exposed to air. Gill filaments are stiff and do not...

A fish (pl.: fish or fishes) is an aquatic, anamniotic, gill-bearing vertebrate animal with swimming fins and a hard skull, but lacking limbs with digits...

family, the Hexanchidae, characterized by an additional pair or pairs of gill slits. Its 37 species are placed within the 10 genera: Gladioserratus, Heptranchias...

fish's importance with a famous cable: "Most Important Preserve Skeleton and Gills = Fish Described." Its discovery 66 million years after its supposed extinction...