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One whale will sound a feeding call, at which point all whales simultaneously swim upwards with mouths open to feed on the trapped fish. [4] As the whales swim up to the surface to feed they can hold up to 15,000 gallons of sea water in their mouths. [citation needed] Humpback whales have 14 to 35 throat grooves that run from the top of the ...
Fossils have revealed an ancient marine reptile with a loosely connected jaw that allowed its throat to balloon out to a massive size so it could filter feed the way right whales do today.
Perrin's beaked whale (Mesoplodon perrini) is part of the toothed whale suborder and is one of over 90 known cetaceans in existence today. [3] Beaked whales are part of the family Ziphiidae , which are the second most diverse group out of all marine mammals with over 20 species currently recognized. [ 4 ]
Their sister order, the Beryciformes, includes the flashlight fish and squirrelfish. Within this group are five families and approximately 18 genera and 32 species (but see below). Thought to have a circumglobal distribution throughout the tropical and temperate latitudes , whalefishes have been recorded at depths in excess of 3,500 metres.
Some individuals have been known to have a second crescent-shaped mark, creating a sort of pale ring encircling a darker spot. It has a high dorsal fin halfway down the length of the body, and two or more throat grooves. The dorsal fin is taller and closer to the head than it is in the pygmy sperm whale, and the back is flatter.
Like tuna, mackerel and other scombroids, billfish streamline themselves by retracting their dorsal fins into a groove in their body when they swim. [4] The shape, size, position and colour of the dorsal fin varies with the type of billfish, and can be a simple way to identify a billfish species.
In fish, the other posterior arches contribute to the brachial skeleton, which support the gills; in tetrapods the anterior arches develop into components of the ear, tonsils, and thymus. [7] The genetic and developmental basis of pharyngeal arch development is well characterized.
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