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As the common octopus' heart and gills are located within its mantle, this high pressure also constricts and puts constraints on the various vessels that are returning blood to the heart. [20] Ultimately, this creates circulation issues and is not a sustainable form of transportation, as the octopus cannot attain an oxygen intake that can ...
Coleoids have two gill hearts (also known as branchial hearts) that move blood through the capillaries of the gills. A single systemic heart then pumps the oxygenated blood through the rest of the body. [54] Like most molluscs, cephalopods use hemocyanin, a copper-containing protein, rather than hemoglobin, to transport oxygen.
Octopus fisheries exist around the world with total catches varying between 245,320 and 322,999 metric tons from 1986 to 1995. [159] The world catch peaked in 2007 at 380,000 tons, and had fallen by a tenth by 2012. [160] Methods to capture octopuses include pots, traps, trawls, snares, drift fishing, spearing, hooking and hand collection. [159]
Branchial hearts are accessory pumps that supplement the action of the systemic heart in a cephalopod's body. They are myogenic in nature. [1] Branchial hearts are always in pairs located at the base of the gills. Each branchial heart consists of a single chamber. [1] [2] They pump blood through the gills via the afferent branchial veins.
Grimpoteuthis [1] is a genus of pelagic cirrate (finned) octopods known as the dumbo octopi. [2] The name "dumbo" originates from their resemblance to the title character of Disney's 1941 film Dumbo, having two prominent ear-like fins which extend from the mantle above each eye.
The World Register of Marine Species lists these 23 genera: [1] Abdopus Norman & Finn, 2001 (7 species) Ameloctopus Norman, 1992 (monotypic) Amphioctopus P. Fischer, 1882 (16 species) Callistoctopus Taki, 1964 (11 species) Cistopus Gray, 1849 (4 species) Euaxoctopus Voss, 1971 (3 species) Galeoctopus Norman, Boucher & Hochberg, 2004 (monotypic)
Mimic octopus showing typical pattern. The mimic octopus was first discovered off the coast of Sulawesi, Indonesia in 1998 on the bottom of a muddy river mouth. [5] [6] It has since been found to inhabit the Indo-Pacific, ranging from the Red Sea and Gulf of Oman in the west to New Caledonia in the east, and Gulf of Thailand and the Philippines in the north to the Great Barrier Reef in south.
Vitreledonella richardi, also known as the glass octopus, is a transparent, gelatinous, and almost colorless meso-to bathypelagic octopod found worldwide in tropical and subtropical seas. Because this octopus mostly lives in deep ocean waters, there have been very few observations of it in the wild.