WebMay 19, 2024 · The spiracle has been lost in manta rays, requiem sharks, hammerhead sharks, chimaeras, lungfishes, coelacanths and neopterygian ray-finned fishes (bowfins, … WebDec 19, 2016 · Like other fish, sharks possess an internal skeleton. A sharks skeleton differs from that of other fish because it is composed entirely of cartilage. Cartilage is a strong and durable material but also light weight and relatively flexible. ... The spiracle is a vestigial first gill slit. It appears as an opening behind the eye, as in the spiny ...
Ganoid Fish and its Types (With Diagram) - Zoology …
WebAug 7, 2024 · August 7, 2024. In Fish. The spiracle is a vestigial first gill slit. It appears as an opening behind the eye, as in the spiny dogfish photo below. It is absent or reduced in many sharks, especially the fast swimming sharks and is usually larger and present in sedentary or bottom dwelling sharks. WebAug 13, 2024 · Cartilaginous fish may also breathe through spiracles, rather than gills. Spiracles are found on top of the heads of all rays and skates, and some sharks. These openings allow the fish to rest on the ocean bottom … ughhs
Lab 2 Chondrichthyes-Osteichthyes.doc - Vertebrate Natural...
WebPelvic. Select all of the characteristics of elasmobranchs called rays. Gill openings on underside of head. Large spiracles behind eyes. Prey on molluscs, crustaceans, and small fish. Elasmobranchs usually have ______ pairs of gills slits. 5 to 7. While elasmobranchs have distinct teeth, members of the subclass Holocephali have. 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. 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 … thomas hendricks obituary