WebJan 23, 2014 · A 380 million-year-old fish from Western Australia called Gogonasus was unusual in having enormous spiracles on top of its head. It belonged to the group of … WebIn spiracle. In elasmobranch and ganoid fishes a pair of spiracles, derived from the gills, is used as a water passageway during respiration. The nasal opening of whales and other cetaceans is called a spiracle, as is the respiratory opening behind the eyes of rays and skates. In… Read More

What is electroreception and how do sharks use it?

Webspiracle. (in fish) a gill-like cleft that opens behind the eye and through which water is drawn in for gaseous exchange (as it is through the mouth) by the expansion of the pharyngeal cavity. It is absent in many bony fish. (in arthropods) the exterior opening of the tracheae, often possessing valves that can close to prevent water loss. WebGill slit. Gill slits are individual openings to gills, i.e., multiple gill arches, which lack a single outer cover. Such gills are characteristic of cartilaginous fish such as sharks and rays, as well as deep-branching vertebrates such as lampreys. In contrast, bony fishes have a single outer bony gill covering called an operculum . pinellas county hunter association horse show

Spiracles – Definition, Types, Examples and Evolution - Toppr-guides

WebVertebrate Natural History Laboratory 2: Chondrichthyes Superclass Gnathostoma Class Chondrichthyes (Cartilaginous Fishes) Subclass Holocephali (Ratfishes) Four gill openings covered by a gill cover; no spiracle; teeth consist of a few grinding plates; no cloaca, separate anal and urogenital openings; skin in adult naked; no stomach; no ribs; males … WebEating toxic shellfish can cause paralytic shellfish poisoning (PSP) in humans. PSP is caused by saxitoxin, which is produced by Alexandrium fundyense and is one of the most potent toxins known to scientists. After … WebSpiracle (vertebrates) Spiracles ( / ˈspɪrəkəl, ˈspaɪ -/ [1] [2]) are openings on the surface of some animals, which usually lead to respiratory systems . The spiracle is a small hole behind each eye that opens to the mouth in some fish. In the jawless fish, the first gill … pinellas county humane society vet