Baleen Whales

The heavyweightb star whales, also birdsonged whalebone whales or great whales, recoil the Mysticeti, one of two suborders of the Cetacea (whales, dolphins, and porpoises). Baleen whales are characterized by having baleen p new-fangleds for filtering food from water, rather than having dentition. This distinguishes them from the other(a) suborder of cetaceans, the fine-tooth(prenominal) whales or Odontoceti. maintenance Mysticeti species have teeth only during the embryotic phase. fogey Mysticeti had teeth before baleen evolved. The suborder contains cardinal families and cardinal species. A list of species can be fix to a lower place and at the Cetacea article. The scientific name derives from the classical news mystidos, which means unknowable. Baleen whales are the largest animals on earth, til now they feed on some of the meekest animals in the ocean. thither are 12 baleen whale species divided into 4 families: indemnify, pigmy flop, gray and rorqual whales . Right whales were called the righteousness whales to envision by archean hunters because they are large, swim slowly, have keen-sighted baleen plates, contain lots of oil, and float when killed. Right whales do non have abaxial fit outs or pharynx grooves. The taxonomy of this family is rather confusing, scarcely currently there are three species of right whales: the northerly right whale, Southern right whale, and bowhead whale. The pygmy right is in a separate family although it shares similar characteristics to right whales. senile whales have their own taxonomic family, genus, and species. They are the close to coastal of the baleen whales and are often found indoors a few miles of shore. Each year gray whales emigrate among their spend feeding cubic yard in the Bering, Chukchi, and Beaufort Seas to their winter breeding grounds off Baja California, Mexico. This is one of the longest migrations by a mammalian species. Gray whales are gray in color and thei r beat is encrusted with barnacles and a un! ique species of small crustaceans known as whale lice. They have 2-3 short throat grooves and instead of a dorsal fin they have a low dorsal hump followed by 6-12 knuckles or bumps. Whalers used to call gray whales devil fish because of their pugnacious response to organism hunted. Rorqual whales are relatively aerodynamic in air and have pointed heads and small pointed fins. They can be distinguished from other whales by m whatsoever (25-90) deep groves along their throats that lose ones temper when they feed. There are 8 species of rorqual whales: the hunchback whale, fin whale, Brydes whale, blue whale, northern minke, antarctic minke, Edens (small-type) whale. earlier baleen whales archetypal appeared as far back as advance(prenominal) Oligocene, or perhaps the latest Eocene (39-29 million years past; E.g. Llanocetus). Early baleen whales possess teeth inherited from their ancestors, as irrelevant to baleen, in modern species. The Oligocene species Aetiocetus coty lalveus is considered the evolutionary link between toothed and baleen whales. It was spy by renowned dodo collector Douglas Emlong in 1964 near Seal Rock arouse sport Site, Oregon in a sandstone formation.

In the early 1990s, the species Janjucetus hunderi was discovered in Victoria, Australia by a surfer and was expound in 2006 by E. M. G. Fitzgerald. Janjucetus was a baleen whale with crisp teeth that hunted fish and squid as healthful as larger prey, potentially including sharks and dolphin-like cetaceans. These fossils hint that early baleen whales were vulturous and eventually evolved into the gentler, edentulate whales known today. A late sketch ident! ified palatal foramina (bony impressions of blood vessels that feed the baleen racks) in the palate of a toothed mysticete, Aetiocetus weltoni. The scientists involved indicated that this discovery implies that this whale possessed both teeth and baleen, and serves as an intermediate adaptive bureau between primitive toothed mysticetes and more travel toothless mysticetes. The first baleen-bearing, toothless baleen whales (such as Eomysticetus, and Micromysticetus)appeared in the late Oligocene. Early baleen whales probably could not echolocate; no anatomic evidence preserved in the skulls and ear regions of any fossil baleen whales show any of the adaptations associated with echolocation as in toothed whales (Odontoceti). Bibliography:http://virtualology.com/aquatichall/baleenwhales.com/http://en.wikipedia.org/wiki/Baleen_whalehttp://www.seaworld.org/infobooks/baleen/home.html If you want to buzz off a sufficient essay, order it on ou r website: OrderCustomPaper.com

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