Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Superphylum: Deuterostomia
Phylum: Chordata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Megaclassis: Osteichthyes
Cladus: Sarcopterygii
Cladus: Rhipidistia
Cladus: Tetrapodomorpha
Cladus: Eotetrapodiformes
Cladus: Elpistostegalia
Superclassis: Tetrapoda
Cladus: Reptiliomorpha
Cladus: Amniota
Cladus: Synapsida
Cladus: Eupelycosauria
Cladus: Sphenacodontia
Cladus: Sphenacodontoidea
Cladus: Therapsida
Cladus: Theriodontia
Subordo: Cynodontia
Infraordo: Eucynodontia
Cladus: Probainognathia
Cladus: Prozostrodontia
Cladus: Mammaliaformes
Classis: Mammalia
Subclassis: Trechnotheria
Infraclassis: Zatheria
Supercohors: Theria
Cohors: Eutheria
Infraclassis: Placentalia
Cladus: Boreoeutheria
Superordo: Laurasiatheria
Cladus: Euungulata
Ordo: Artiodactyla
Cladus: Artiofabula
Cladus: Cetruminantia
Subordo: Whippomorpha
Infraordo: Cetacea
Cladus: Neoceti
Parvordo: Mysticeti
Familia: Balaenopteridae
Genera: †Archaebalaenoptera – Balaenoptera – †Diunatans – †Marzanoptera – Megaptera – †Parabalaenoptera – †Plesiobalaenoptera – ? Pterobalaena – ? Rorqualus
Subfamilia Eschrichtiinae: Eschrichtius – †Archaeschrichtius – †Eschrichtioides – †Gricetoides
Name
Balaenopteridae J. E. Gray, 1864
Typus: Balaenoptera
Lacépède, 1804
References
Proceedings of the Zoological Society of London 1864. 203.
Bisconti, M. 2007. A new basal balaenopterid from the Early Pliocene of northern Italy. Palaeontology 50: 1103–1122. DOI: 10.1111/j.1475-4983.2007.00696.x
Bisconti, M. 2010. A new balaenopterid whale from the Late Miocene of the Stirone River, Northern Italy (Mammalia, Cetacea, Mysticeti). Journal of Vertebrate Paleontology 30: 943–958. DOI: 10.1080/02724631003762922
Bosselaers, M. & Post, K. 2010. A new fossil rorqual (Mammalia, Cetacea, Balaenopteridae) from the Early Pliocene of the North Sea, with a review of the rorqual species described by Owen and Van Beneden. Geodiversitas 32: 331–363. PDF.
Balaenopteridae in Mammal Species of the World.
Wilson, Don E. & Reeder, DeeAnn M. (Editors) 2005. Mammal Species of the World – A Taxonomic and Geographic Reference. Third edition. ISBN 0-8018-8221-4.
Hassanin, A.; Delsuc, F.; Rpiquet, A.; Hammer, C.; Vuuren, B. J.; Matthee, C.; Ruiz-Garcia, M.; Gatzeflis, F.; Areskoug, V.; Nguyen, T. T.; Couloux, A. (2012). "Pattern and timing of diversification of Cetartiodactyla (Mammalia, Laurasiatheria), as revealed by a comprehensive analysis of mitochondrial genomes". Comptes Rendus Biologies. 335 (1): 32–50. doi:10.1016/j.crvi.2011.11.002. PMID: 22226162.
Marx, F. G., Fordyce, R. E., 2015. Baleen boom and bust: a synthesis of mysticete phylogeny, diversity and disparity. Royal Society Open Science 2(4): 140434. DOI: 10.1098/rsos.140434.
Burgin, C.J., Wilson, D.E., Mittermeier, R.A., Rylands, A.B., Lacher, T.E., Sechrest, W. 2020. Illustrated Checklist of the Mammals of the World. Lynx Edicions: Barcelona. 2 volumes. Vol 1: Monotremata to Rodentia. 631 pp. ISBN 978-84-16728-34-3. Vol 2: Eulipotyphla to Carnivora. 535 pp. ISBN 978-84-16728-35-0. Reference page. [1]
Vernacular names
Deutsch: Furchenwale
English: Rorquals
suomi: Uurteisvalaat
magyar: Barázdásbálna-félék
日本語: ナガスクジラ科
한국어: 긴수염고래과
Nederlands: Vinvissen
norsk: Finnhvaler
polski: Fałdowce, Płetwalowate
svenska: Fenvalar
ไทย: วาฬอกร่อง
Türkçe: Çatal kuyruklu balinagiller
Rorquals (/ˈrɔːrkwəlz/) are the largest group of baleen whales, which comprise the family Balaenopteridae, containing ten extant species in three genera. They include the largest animal that has ever lived, the blue whale, which can reach 180 tonnes (200 short tons), and the fin whale, which reaches 120 tonnes (130 short tons); even the smallest of the group, the northern minke whale, reaches 9 tonnes (10 short tons).
Rorquals take their name from French rorqual, which derives from the Norwegian word røyrkval: the first element røyr originated from the Old Norse name for this type of whale, reyðr,[3] probably related to the Norse word for "red", and the second from the Norse word hvalr meaning "whale" in general.[4] The family name Balaenopteridae is from the type genus, Balaenoptera.
Characteristics
All members of the family have a series of longitudinal folds of skin running from below the mouth back to the navel (except the sei whale and common minke whale, which have shorter grooves). These furrows allow the mouth to expand immensely when feeding, "permitting them to engorge great mouthfuls of food and water in a single gulp".[5] These "pleated throat grooves" distinguish balaenopterids from other whales.[5]
Rorquals are slender and streamlined in shape, compared with their relatives the right whales, and most have narrow, elongated flippers. They have a dorsal fin, situated about two-thirds the way back. Most rorquals feed by gulping in water, and then pushing it out through the baleen plates with their tongue; the exception is the gray whale, which gulps in and filters large amounts of marine sediments from the seafloor. They feed on crustaceans, such as krill, but also on various fish, such as herrings and sardines.[6]
Gestation in rorquals lasts 11–12 months, so that both mating and birthing occur at the same time of year. Cows give birth to a single calf, which is weaned after 6–12 months, depending on species.[6] Of some species, adults live in small groups, or "pods" of two to five individuals. For example, humpback whales have a fluid social structure, often engaging behavioral practices in a pod, other times being solitary.
Distribution and habitat
Distribution is worldwide: the blue, fin, humpback, and the sei whales are found in all major oceans; the common (northern) and Antarctic (southern) minke whale species are found in all the oceans of their respective hemispheres; either of Bryde's whale and Eden's whale occur in the Atlantic, Pacific, and Indian oceans, being absent only from the cold waters of the Arctic and Antarctic; and the gray whale is found in the northern Pacific Ocean, although it was also found in the Atlantic Ocean in historic times.[7] Rice's whale has the smallest distribution of rorquals and possibly baleen whales in general, being endemic to a small portion of the Gulf of Mexico west of the Florida peninsula and south of Alabama and the Florida panhandle, although it likely formerly had a much wider distribution in the Gulf.[8]
Most rorquals are strictly oceanic: the exceptions are the gray whale, Bryde's whale, Eden's whale, and Rice's whale (which are usually found close to shore all year round)[9] and the humpback whale (which is oceanic but passes close to shore when migrating). It is the largest and the smallest types — the blue whale and Antarctic minke whale — that occupy the coldest waters in the extreme south; the fin whale tends not to approach so close to the ice shelf; the sei whale tends to stay further north again. (In the northern hemisphere, where the continents distort weather patterns and ocean currents, these movements are less obvious, although still present.) Within each species, the largest individuals tend to approach the poles more closely, while the youngest and fittest ones tend to stay in warmer waters before leaving on their annual migration.
Most rorquals breed in tropical waters during the winter, then migrate back to the polar feeding grounds rich in plankton and krill for the short polar summer.
Feeding habits
Humpback feeding on young pollock off Alaska
As well as other methods, rorquals obtain prey by lunge-feeding on bait balls.[10] Lunge feeding is an extreme feeding method, where the whale accelerates to a high velocity and then opens its mouth to a large gape angle. This generates the water pressure required to expand its mouth and engulf and filter a huge amount of water and fish.[10] The gray whale does not lunge feed, as it gulps in sediments from the seafloor rather than water.
Rorquals have a number of anatomical features that enable them to do this, including bilaterally separate mandibles, throat pleats that can expand to huge size, and a unique sensory organ consisting of a bundle of mechanoreceptors that helps their brains to coordinate the engulfment action.[11] Furthermore, their large nerves are flexible so that they can stretch and recoil.[12] In fact, they give rorquals the ability to open their mouths so wide that they would be capable of taking in water at volumes greater than their own sizes. These nerves are packed into a central core area that is surrounded by elastin fibers. Opening the mouth causes the nerves to unfold, and they snap back after the mouth is closed.[12] According to Potvin and Goldbogen, lunge feeding in rorquals represents the largest biomechanical event on Earth.[13]
Taxonomy
Cladogram of the family Balaenopteridae using complete mtDNA sequences and short interspersed repetitive element (SINE) insertion data.
Skeleton of the extinct Plesiobalaenoptera hubachi at the Museum für Naturkunde, Berlin
Formerly, the rorqual family Balaenopteridae was split into two subfamilies, the Balaenopterinae and the Megapterinae, with each subfamily containing one genus, Balaenoptera and Megaptera, respectively. However, the phylogeny of the various rorqual species shows the current division is paraphyletic, and in 2005, the division into subfamilies was dropped.[14] Two genetic studies, one in 2018 and one in 2020, suggest that the gray whale (Eschrichtius robustus) be counted among the rorquals, being more derived than the two minke whales but basal to the humpback whale, fin whale, and the other taxa classified in Balaenoptera.[15][16]
The discovery of a new species of balaenopterid, Omura's whale (Balaenoptera omurai), was announced in November 2003, which looks similar to, but smaller than, the fin whale; individuals of this species were found in Indo-Pacific waters. The discovery of the highly endangered Rice's whale was announced in 2021 after a genetic study found it to be distinct from Eden's whale; this species is known from a small portion of the northeastern Gulf of Mexico.[17]
Extant species
Family Balaenopteridae: Rorquals[18]
Balaenoptera
Fin whale, Balaenoptera physalus
Northern fin whale, Balaenoptera physalus physalus
Southern fin whale, Balaenoptera physalus quoyi
Sei whale, Balaenoptera borealis
Bryde's whale, Balaenoptera edeni
Eden's whale, Balaenoptera edeni edeni
Rice's whale, Balaenoptera ricei
Blue whale, Balaenoptera musculus
Pygmy blue whale, Balaenoptera musculus brevicauda
Common minke whale, Balaenoptera acutorostrata
Antarctic minke whale, Balaenoptera bonaerensis
Omura's whale, Balaenoptera omurai
Eschrichtius
Gray whale, Eschrichtius robustus
Megaptera
Humpback whale, Megaptera novaeangliae
Fossil genera
†Archaebalaenoptera
†Archaeschrichtius
†Cetotheriophanes
†Diunatans
†Eschrichtioides
†Gricetoides
†Incakujira
†Miobalaenoptera
†Nehalaennia
†Parabalaenoptera
†Plesiobalaenoptera
†Plesiocetus
†Praemegaptera
†Protororqualus
Incakujira anilliodefuego paratype
Alternative generic taxonomy for living rorquals
In 2012, the following alternate taxonomy was presented:[19]
Balaenoptera
Fin whale, Balaenoptera physalus
Megaptera
Humpback whale, Megaptera novaeangliae
Pterobalaena
Common minke whale, Pterobalaena acutorostrata
Antarctic minke whale, Pterobalaena bonaerensis
Rorqualus
Sei whale, Rorqualus borealis
Bryde's whale, Rorqualus brydei
Eden's whale, Rorqualus edeni
Blue whale, Rorqualus musculus
Omura's whale, Rorqualus omurai
References
Notes
"Family Balaenopteridae Gray 1864 (rorqual)". Fossilworks. Retrieved 9 April 2018.
Mead, J. G.; Brownell, R. L. Jr. (2005). "Order Cetacea". In Wilson, D. E.; Reeder, D. M. (eds.). Mammal Species of the World: A Taxonomic and Geographic Reference (3rd ed.). Johns Hopkins University Press. pp. 723–743. ISBN 978-0-8018-8221-0. OCLC 62265494.
"rorqual". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.): "ad. Norw. røyrkval, repr. ON. *røyðar-, OIcel. reyðar-hvalr, f. reyðurreyðr the specific name + hvalr whale."
The Century Dictionary. 1895. p. 5228.
Minasian, Stanley M.; Balcomb, Kenneth C.; Foster, Larry, eds. (1984). The World's Whales: The Complete Illustrated Guide. New York: The Smithsonian Institution. p. 18. ISBN 978-0-89599-014-3.
Gambell, Ray (1984). Macdonald, D (ed.). The Encyclopedia of Mammals. New York: Facts on File. pp. 222–225. ISBN 978-0-87196-871-5.
"All About Baleen Whales | SeaWorld Parks & Entertainment". seaworld.org. Retrieved 2021-01-23.
Rosel, Patricia E.; Wilcox, Lynsey A.; Yamada, Tadasu K.; Mullin, Keith D. (2021). "A new species of baleen whale (Balaenoptera) from the Gulf of Mexico, with a review of its geographic distribution". Marine Mammal Science. 37 (2): 577–610. doi:10.1111/mms.12776. ISSN 1748-7692.
Handbook, Whale Watching (2021-01-22). "Bryde's Whale". Whale Watching Handbook. Retrieved 2021-01-23.
Reeves, RR; Stewart, BS; Clapham, PJ; Powell, JA (2002). National Audubon Society Guide to Marine Mammals of the World. Chanticleer Press. ISBN 978-0-375-41141-0.[page needed]
Pyenson, N.D.; Goldbogen, J.A.; Vogl, A.W.; Szathmary, G; Drake, R.L.; Shadwick, R.E. (2012). "Discovery of a sensory organ that coordinates lunge feeding in rorqual whales". Nature. Nature Publishing Group. 485 (7399): 498–501. Bibcode:2012Natur.485..498P. doi:10.1038/nature11135. PMID 22622577. S2CID 1200222.
McSpadden, Kevin (5 May 2015). "Gigantic Whales Eat Thanks To 'Bungee-Cord' Nerves". TIME.com. Retrieved 6 May 2015.
Potvin, J; Goldbogen, J.A. (2009). "Passive versus active engulfment: verdict from trajectory simulations of lunge-feeding fin whales Balaenoptera physalus". J. R. Soc. Interface. 6 (40): 1005–1025. doi:10.1098/rsif.2008.0492. PMC 2827442. PMID 19158011.
Deméré, T.A.; Berta, A.; McGowen, M.R. (2005). "The taxonomic and evolutionary history of fossil and modern balaenopteroid mysticetes". Journal of Mammalian Evolution. 12 (1/2): 99–143. doi:10.1007/s10914-005-6944-3. S2CID 90231.
Árnason, Úlfur; Lammers, Fritjof; Kumar, Vikas; Nilsson, Maria A.; Janke, Axel (2018). "Whole-genome sequencing of the blue whale and other rorquals finds signatures for introgressive gene flow". Science Advances. 4 (4): eaap9873. Bibcode:2018SciA....4.9873A. doi:10.1126/sciadv.aap9873. PMC 5884691. PMID 29632892.
McGowen, Michael R; Tsagkogeorga, Georgia; Álvarez-Carretero, Sandra; dos Reis, Mario; Struebig, Monika; Deaville, Robert; Jepson, Paul D; Jarman, Simon; Polanowski, Andrea; Morin, Phillip A; Rossiter, Stephen J (2019-10-21). "Phylogenomic Resolution of the Cetacean Tree of Life Using Target Sequence Capture". Systematic Biology. 69 (3): 479–501. doi:10.1093/sysbio/syz068. ISSN 1063-5157. PMC 7164366. PMID 31633766.
Fisheries, NOAA (2021-01-19). "Gulf of Mexico Bryde's Whale | NOAA Fisheries". NOAA. Retrieved 2021-01-22.
"List of Marine Mammal Species and Subspecies". Society for Marine Mammalogy. 2021. Retrieved January 18, 2022.
Hassanin, A.; Delsuc, F.; Rpiquet, A.; Hammer, C.; Vuuren, B. J.; Matthee, C.; Ruiz-Garcia, M.; Gatzeflis, F.; Areskoug, V.; Nguyen, T. T.; Couloux, A. (2012). "Pattern and timing of diversification of Cetartiodactyla (Mammalia, Laurasiatheria), as revealed by a comprehensive analysis of mitochondrial genomes". Comptes Rendus Biologies. 335 (1): 32–50. doi:10.1016/j.crvi.2011.11.002. PMID 22226162.
Sources
Gray, J. E. (1864). "Notes on the Whalebone-Whales; with a Synopsis of the Species". The Annals and Magazine of Natural History. 14 (83): 345–353. doi:10.1080/00222936408681724.
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