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Kogiidae ( Breton )

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Kogiidae a zo ur c'herentiad e rummatadur ar bronneged, ennañ daou spesad morviled. Ne vez ket graet gant ar c'herentiad-mañ en holl rummatadurioù hag e zaou spesad a c'hell bezañ renket e Physeteridae asambles gant ar c'hwezher bras.

Spesadoù

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Kogiidae: Brief Summary ( Breton )

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Kogiidae a zo ur c'herentiad e rummatadur ar bronneged, ennañ daou spesad morviled. Ne vez ket graet gant ar c'herentiad-mañ en holl rummatadurioù hag e zaou spesad a c'hell bezañ renket e Physeteridae asambles gant ar c'hwezher bras.

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Kògids ( Catalan; Valencian )

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Els kògids (Kogiidae) són una família de cetacis odontocets que conté dues espècies vivents i tres d'extintes.[1] Algunes classificacions no reconeixen aquesta família i situen el gènere Kogia dins la família dels fisetèrids.[2]

Descripció

Aquests cetacis es caracteritzen per tenir la boca en posició ventral respecte al crani (a diferència dels dofins i la majoria d'odontocets). Manquen de dents al maxil·lar superior. El maxil·lar inferior té les dents còniques. Igual que el catxalot, tenen espermaceti al meló.

Referències

 src= A Wikimedia Commons hi ha contingut multimèdia relatiu a: Kògids Modifica l'enllaç a Wikidata
  1. 1,0 1,1 Entrada «Kogiidae» de la Paleobiology Database (en anglès).
  2. Taylor, B. L. et al. Kogia breviceps. UICN 2008. Llista Vermella d'espècies amenaçades de la UICN, edició 2008, consultada el 22 juliol 2017.
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Kògids: Brief Summary ( Catalan; Valencian )

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Els kògids (Kogiidae) són una família de cetacis odontocets que conté dues espècies vivents i tres d'extintes. Algunes classificacions no reconeixen aquesta família i situen el gènere Kogia dins la família dels fisetèrids.

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Kogiidae ( Albanian )

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Kogiidae është një familje e përbërë nga dy lloje ekzistuese të cetaceve, pjesë e superfamiljes Physeteroidea. Një numër i gjinive janë zhdukur.

Taksonomia

  • Gjinia Kogia
  • Gjinia Aprixokogia
  • Gjinia Kogiopsis
  • Gjinia Praekogia
  • Gjinia Scaphokogia
  • Gjinia Thalassocetus

Shiko dhe

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Kogiidae ( Interlingua (International Auxiliary Language Association) )

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Kogiidae es un familia de Odontoceti, Physeteroidea.

Nota
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Kogiidae: Brief Summary ( Albanian )

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Kogiidae është një familje e përbërë nga dy lloje ekzistuese të cetaceve, pjesë e superfamiljes Physeteroidea. Një numër i gjinive janë zhdukur.

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Kogiidae

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Kogiidae is a family comprising at least two extant species of Cetacea, the pygmy (Kogia breviceps) and dwarf (K. sima) sperm whales. As their common names suggest, they somewhat resemble sperm whales, with squared heads and small lower jaws, but are much smaller in size, with much shorter skulls and more notable dorsal fins than sperm whales.[2] Kogiids are also characterized by a "false gill slit" behind their eyes.[3]

A number of genera are extinct.[4]

Taxonomy

There is some amount of uncertainty over if Kogiidae belongs in the sperm whale family. Research still suggests a close relationship between Kogiidae and sperm whales using mitochondrial DNA, which supports Kogiidae as part of the sperm whale family.[5] This relationship is supported by similarities of the anatomical structures in the head, responsible for sound production, in particular the presence of a spermaceti organ.[6] Other phylogenetic research raises further questions over a potential relationship between kogiids and Ziphiidae.[5] Other questions exist regarding the high relatedness in mitochondrial DNA between Platanista and kogiids.[7] Fossil evidence is limited for this family, which potentially limits an understanding of their relationship to other extant cetaceans.[8]

Researchers have proposed that K. sima may represent at least two genetically unique species, and further genetic research is needed to determine the real number of extant species of Kogiidae.[9]

A comparison of an extinct monodont, Denebola brachycephala (top), and an extinct kogiid, Praekogia cedrosensis (bottom), both from the Late Miocene.

ORDER ARTIODACTYLA

Biology

Kogiid skulls are characterized by a very short rostrum, the smallest among extant cetaceans, as well as high levels of asymmetry, which is expected among odontocetes.[8][12] Kogiid skulls have the most blunt mandible among extant cetaceans as well. Extant kogiidae also show relatively high encephalization quotient, the ratio between observed brain size and expected brain size. The pygmy sperm whale has an EQ of 1.78, while the dwarf sperm whale's EQ is 1.63.[8] Kogiidae do possess spermaceti in their head like sperm whales.[13] However, kogiid spermaceti is unique as the whales are able to control its temperature.[14] Kogiidae are also homodonts, showing teeth all of the same size and shape.[15]

Kogiidae possess a unique system of organs to produce sound, including a bagpipe-like structure to produce sound and an amplifying horn.[14]

Kogiidae have a modified colon which works as an "ink sac", storing liquid red feces.[16] They are able to release over three gallons of this fecal "ink" to confuse or discourage predators.[17]

Ecology

Range

Kogiidae are believed to be cosmopolitan species, inhabiting all oceans except polar waters, remaining between the 50° latitude lines.[16]

Two fossilized species of Kogia sp. were shown to exhibit sympatry, similar to the two modern members of Kogia, which researchers suggested shows that this behavior has been part of Kogiidae for at least 3 million years.[18]

Behavior and feeding

Extant kogiids travel in small groups and rarely surface, potentially to avoid predators like orcas.[19]

Kogiidae are deep diving whales, believed to dive up to depths of 500 m.[8] Kogiids feed using a technique known as suction feeding, and their diet primarily consists of squid.[20][21] Pygmy sperm whales are able to eat larger prey than dwarf sperm whales, although their diet as a whole is relatively similar.[21] They have also been observed using echolocation to find their prey, and their hearing places them in the "Very High Frequency" group of cetaceans that can hear well above 100 kHz.[22][23]

Human threats

Most observations of Kogia have come from individuals tangled in fishing line or stranded individuals.[8] There is a commercial fishery for K. breviceps in parts of southeast Asia and the Lesser Antilles.[24] Both species of extant kogiidae have also been observed stranded with plastics blocking their intestines.[17][24]

References

  1. ^ "Fossilworks: Kogiidae".
  2. ^ A., Jefferson, Thomas (1993). Marine mammals of the world. Leatherwood, Stephen., Webber, Marc A., United Nations Environment Programme., Food and Agriculture Organization of the United Nations. Rome: United Nations Environment Programme. p. 64. ISBN 978-9251032923. OCLC 30643250.
  3. ^ Reid, Fiona (2009). A field guide to the mammals of Central America & Southeast Mexico (2nd ed.). Oxford: Oxford University Press. p. 301. ISBN 978-0195343229. OCLC 237402526.
  4. ^ a b Kellogg, Remington; Matthew, William Diller (1929). "A new fossil toothed whale from Florida. American Museum novitates ; no. 389". hdl:2246/3135. {{cite journal}}: Cite journal requires |journal= (help)
  5. ^ a b May-Collado, Laura; Agnarsson, Ingi (2006). "Cytochrome b and Bayesian inference of whale phylogeny". Molecular Phylogenetics and Evolution. 38 (2): 344–354. doi:10.1016/j.ympev.2005.09.019. PMID 16325433.
  6. ^ Clarke, M.R. (2003). "Production and control of sound by the small sperm whales, Kogia breviceps and K. sima and their implications for other cetacea". Journal of the Marine Biological Association of the United Kingdom. 83 (2): 241–263. doi:10.1017/S0025315403007045h. S2CID 84103043.
  7. ^ Verma, Sunil Kumar; Sinha, Ravindra Kumar; Singh, Lalji (2004). "Phylogenetic position of Platanista gangetica: insights from the mitochondrial cytochrome b and nuclear interphotoreceptor retinoid-binding protein gene sequences". Molecular Phylogenetics and Evolution. 33 (2): 280–288. doi:10.1016/j.ympev.2004.06.018. PMID 15336663.
  8. ^ a b c d e Perrin, William; Würsig, Bernd; Thewissen, J. G. M. (2008). Encyclopedia of Marine Mammals. Elsevier Science. ISBN 9780080919935.
  9. ^ Chivers, S. J.; Leduc, R. G.; Robertson, K. M.; Barros, N. B.; Dizon, A. E. (2005-10-01). "Genetic Variation of Kogia Spp. with Preliminary Evidence for Two Species of Kogia Sima". Marine Mammal Science. 21 (4): 619–634. CiteSeerX 10.1.1.222.2209. doi:10.1111/j.1748-7692.2005.tb01255.x. ISSN 1748-7692.
  10. ^ a b c d e f Velez-Juarbe, Jorge; Wood, Aaron R.; Gracia, Carlos De; Hendy, Austin J. W. (2015-04-29). "Evolutionary Patterns among Living and Fossil Kogiid Sperm Whales: Evidence from the Neogene of Central America". PLOS ONE. 10 (4): e0123909. Bibcode:2015PLoSO..1023909V. doi:10.1371/journal.pone.0123909. ISSN 1932-6203. PMC 4414568. PMID 25923213.
  11. ^ Alberto Collareta; Franco Cigala Fulgosi; Giovanni Bianucci (2019). "A new kogiid sperm whale from northern Italy supports psychrospheric conditions in the early Pliocene Mediterranean Sea". Acta Palaeontologica Polonica. 64. doi:10.4202/app.00578.2018.
  12. ^ Huggenberger, S.; Leidenberger, S.; Oelschläger, H. H. A. (December 13, 2016). "Asymmetry of the nasofacial skull in toothed whales (Odontoceit)". Journal of Zoology. 302 (1): 15–23. doi:10.1111/jzo.12425.
  13. ^ Costa-Silva, Samira; Sacristán, Carlos; Groch, Kátia regina; Sánchez-Sarmiento, Angélica María; Reisfeld, Laura; Dutra, Gustavo; Lassálvia, Cristiane; Catão-Dias, José Luiz (2017-01-01). "Histological aspects of the mucosa of the spermaceti chamber of a dwarf sperm whale". Brazilian Journal of Veterinary Research and Animal Science. 53 (3): 1. doi:10.11606/issn.1678-4456.bjvras.2016.109799. ISSN 1413-9596.
  14. ^ a b Clarke, M. R. (April 2003). "Production and control of sound by the small sperm whales, Kogia breviceps and K. sima and their implications for other Cetacea". Journal of the Marine Biological Association of the United Kingdom. 83 (2): 241–263. doi:10.1017/s0025315403007045h. ISSN 1469-7769. S2CID 84103043.
  15. ^ "Cetacean Palaeobiology". palaeo.gly.bris.ac.uk. Retrieved 2017-12-05.
  16. ^ a b Bloodworth, Brian E.; Odell, Daniel K. (2008-10-09). "Kogia breviceps (Cetacea: Kogiidae)". Mammalian Species (819): 1–12. doi:10.1644/819.1. ISSN 0076-3519.
  17. ^ a b Fisheries, NOAA (2017-05-05). "Dwarf Sperm Whale (Kogia sima) :: NOAA Fisheries". www.nmfs.noaa.gov. Retrieved 2017-11-22.
  18. ^ Vélez-Juarbe, Jorge; Wood, Aaron R.; Pimiento, Catalina (2016-07-03). "Pygmy sperm whales (Odontoceti, Kogiidae) from the Pliocene of Florida and North Carolina". Journal of Vertebrate Paleontology. 36 (4): e1135806. doi:10.1080/02724634.2016.1135806. ISSN 0272-4634. S2CID 130506478.
  19. ^ Morisaka, T.; Connor, R. C. (2007-07-01). "Predation by killer whales (Orcinus orca) and the evolution of whistle loss and narrow-band high frequency clicks in odontocetes". Journal of Evolutionary Biology. 20 (4): 1439–1458. doi:10.1111/j.1420-9101.2007.01336.x. ISSN 1420-9101. PMID 17584238.
  20. ^ Bloodworth, Brian; Marshall, Christopher D. (2005-10-01). "Feeding kinematics of Kogia and Tursiops (Odontoceti: Cetacea): characterization of suction and ram feeding". Journal of Experimental Biology. 208 (19): 3721–3730. doi:10.1242/jeb.01807. ISSN 0022-0949. PMID 16169949.
  21. ^ a b Staudinger, Michelle D.; McAlarney, Ryan J.; McLellan, William A.; Ann Pabst, D. (2014-04-01). "Foraging ecology and niche overlap in pygmy (Kogia breviceps) and dwarf (Kogia sima) sperm whales from waters of the U.S. mid-Atlantic coast". Marine Mammal Science. 30 (2): 626–655. doi:10.1111/mms.12064. ISSN 1748-7692.
  22. ^ Merkens, Karlina; Barkley, Yvonne; Hill, Marie; Oleson, Erin (2016-10-01). "Dwarf sperm whale (Kogia sima) echolocation clicks from Guam (Western North Pacific Ocean)". The Journal of the Acoustical Society of America. 140 (4): 3415. Bibcode:2016ASAJ..140Q3415M. doi:10.1121/1.4970977. ISSN 0001-4966.
  23. ^ Southall, Brandon L.; et al. (2019-03-11). "Marine mammal noise exposure criteria: updated scientific recommendations for residual hearing effects". Aquatic Mammals. 45 (2): 125–232. doi:10.1578/AM.45.2.2019.125. S2CID 91521545.
  24. ^ a b Fisheries, NOAA (2017-05-05). "Pygmy Sperm Whale (Kogia breviceps) :: NOAA Fisheries". www.nmfs.noaa.gov. Retrieved 2017-11-17.
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Kogiidae: Brief Summary

provided by wikipedia EN

Kogiidae is a family comprising at least two extant species of Cetacea, the pygmy (Kogia breviceps) and dwarf (K. sima) sperm whales. As their common names suggest, they somewhat resemble sperm whales, with squared heads and small lower jaws, but are much smaller in size, with much shorter skulls and more notable dorsal fins than sperm whales. Kogiids are also characterized by a "false gill slit" behind their eyes.

A number of genera are extinct.

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Kogiidae ( Spanish; Castilian )

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Los cógidos o cogíidos (Kogiidae) son una familia de cetáceos odontocetos, que incluye dos especies vivientes, el cachalote pigmeo y el cachalote enano, y tres especies extintas.[1]​ Algunas clasificaciones no reconocen esta familia y ubican el género Kogia en la familia Physeteridae.[2][3]

Descripción

Estos cetáceos se caracterizan por poseer la boca en posición ventral en relación al cráneo (a diferencia de los delfines y la mayoría de los odontocetos). No poseen dientes en el maxilar superior. El maxilar inferior presenta dientes cónicos. Al igual que el cachalote, poseen espermaceti en el melón.

Taxonomía

Esta familia solo posee un género y dos especies actuales:

Familia Kogiidae

Referencias

  1. The Paleobioly Database. «Kogiidae» (en inglés). Consultado el 9 de abril de 2011.
  2. Wilson, Don E.; Reeder, DeeAnn M., eds. (2005). «Physeteridae». Mammal Species of the World (en inglés) (3ª edición). Baltimore: Johns Hopkins University Press, 2 vols. (2142 pp.). ISBN 978-0-8018-8221-0.
  3. Taylor, B.L., Baird, R., Barlow, J., Dawson, S.M., Ford, J.K.B., Mead, J.G., Notarbartolo di Sciara, G., Wade, P. & Pitman, R.L. (2012). «Kogia breviceps». Lista Roja de especies amenazadas de la UICN 2015.4 (en inglés). ISSN 2307-8235. Consultado el 6 de febrero de 2016.
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Kogiidae: Brief Summary ( Spanish; Castilian )

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Los cógidos o cogíidos (Kogiidae) son una familia de cetáceos odontocetos, que incluye dos especies vivientes, el cachalote pigmeo y el cachalote enano, y tres especies extintas.​ Algunas clasificaciones no reconocen esta familia y ubican el género Kogia en la familia Physeteridae.​​

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Kogiidae ( Basque )

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Kogiidae zetazeoen familia da, egun bi espezie besterik ez zituena. Hala ere beste genero iraungituak ditu:[1]

Erreferentziak

  1. The Paleobioly Database Kogiidae.
(RLQ=window.RLQ||[]).push(function(){mw.log.warn("Gadget "ErrefAurrebista" was not loaded. Please migrate it to use ResourceLoader. See u003Chttps://eu.wikipedia.org/wiki/Berezi:Gadgetaku003E.");});
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Kogiidae: Brief Summary ( Basque )

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Kogiidae zetazeoen familia da, egun bi espezie besterik ez zituena. Hala ere beste genero iraungituak ditu:

Kogia Kaxalote pigmeo (Kogia breviceps) Kogia sima Kogia pusillaAprixokogiaKogiopsisPraekogiaScaphokogiaThalassocetus
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Kogiidae ( French )

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Les Kogiidés (Kogiidae) forment une famille de cétacés, plus exactement de tout petits cachalots. Ne comptant plus que deux espèces encore vivantes regroupées dans un même genre, elle est parfois placée dans la famille des Physeteridae.

Liste des taxons inférieurs

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Kogiidae: Brief Summary ( French )

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Les Kogiidés (Kogiidae) forment une famille de cétacés, plus exactement de tout petits cachalots. Ne comptant plus que deux espèces encore vivantes regroupées dans un même genre, elle est parfois placée dans la famille des Physeteridae.

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Coxíidos ( Galician )

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A dos coxíidos (Kogiidae) é unha familia de cetáceos odontocetos que inclúe dúas especies viventes, o cachalote pigmeo e o cachalote anano, e tres especies extintas.[1]

Algunhas clasificacións no recoñecen esta familia e sitúan ao seu único xénero, Kogia, na familia dos fisetéridos,[2][3] dentro da submailia dos Koginae Gill, 1871, pero hoxe está aceptado este grupo como familia Kogiidae Gill, 1871.[4]

Descrición

Estes cetáceos caracterízanse por teren a boca en posición ventral en relación ao cranio, a diferenza dos delfínidos e a maioría dos demais odondtocetos. Non teñen dentes no maxilar superior, e o inferior presenta dentes cónicos. Ao igual que o cachalote, posúen espermaceti no melón.

O tamaño do seu corpo é pequeno, en comparación có doutros cetáceos (entre 3 e 3,5 m), e especialmente co do seu máis próximo parente, o cachalote.[5] e bastante repoludo, cunha aleta dorsal pequena, falciforme, e a caudal cunha incisura media lixeira, a as pectorais anchas e curtas, situadas en posición moi adiantada. Presentan unha falsa galada detrás da súa cabeza, que é de forma cuadrangular.[6]

Distribúense por todos os océanos do mundo, en augas profundas cerca das costas.[6]

Taxonomía

A familia só conta cun xénero e dúas especies actuais:

Familia Kogiidae

Notas

Véxase tamén

Bibliografía

  • Carwardine, Mark (1995): Ballenas, delfines y marsopas. Barcelona: Ediciones Omega. ISBN 84-282-1037-3.
  • Duguy, R. e Robineau, D. (1987): Guía de los mamíferos marinos de Europa. Barcelona: Ediciones Omega. ISBN 84-282-0811-5.

Outros artigos

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Coxíidos: Brief Summary ( Galician )

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A dos coxíidos (Kogiidae) é unha familia de cetáceos odontocetos que inclúe dúas especies viventes, o cachalote pigmeo e o cachalote anano, e tres especies extintas.

Algunhas clasificacións no recoñecen esta familia e sitúan ao seu único xénero, Kogia, na familia dos fisetéridos, dentro da submailia dos Koginae Gill, 1871, pero hoxe está aceptado este grupo como familia Kogiidae Gill, 1871.

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Nykštukiniai kašalotai ( Lithuanian )

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Mažojo nykštukinio kašaloto paplitimo arelas
Nykštukinio kašaloto paplitimo arelas

Nykštukiniai kašalotai (lot. Kogiidae) – banginių (Cetacea) šeima.

Šeimoje 2 rūšys:

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Dwergpotvissen ( Dutch; Flemish )

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Dwergpotvissen (Kogiidae) zijn een familie van walvissen. Naast het levende geslacht van de echte dwergpotvissen (Kogia) omvat het de fossiele geslachten Kogiopsis, Miokogia, Praekogia en Scaphokogia. Ze zijn nauw verwant aan de potvissen (Physeteridae) en worden vaak tot dezelfde familie gerekend.

Er zijn maar twee levende soorten:

De dwergpotvis en de kleinste potvis zijn heel moeilijk te onderscheiden: de kleinste dwergpotvis is een beetje kleiner en blauwer van kleur. De vorm van de kop en lichaam zijn nagenoeg hetzelfde.

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Kogiowate ( Polish )

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Kogiowate[2], (Kogiidae) – rodzina ssaków z kladu zębowców (Odontoceti) w obrębie waleni (Cetacea). Kaszaloty małe są bliskimi krewnymi kaszalotowatych i tak jak one żywią się rybami i mięczakami głębin morskich. Żeby odstraszyć potencjalnych wrogów upodobniły się morfologicznie do rekinów imitując ich kształt głowy i szczelin skrzelowych.

Systematyka

Do rodziny należy jeden współcześnie występujący rodzaj[2]:

oraz rodzaje wymarłe:

W niektórych systematykach kaszaloty małe są zaliczane do rodziny kaszalotowatych[6].

Przypisy

  1. Kogiidae, w: Integrated Taxonomic Information System (ang.).
  2. a b Włodzimierz Cichocki, Agnieszka Ważna, Jan Cichocki, Ewa Rajska, Artur Jasiński, Wiesław Bogdanowicz: Polskie nazewnictwo ssaków świata. Warszawa: Muzeum i Instytut Zoologii PAN, 2015, s. 190. ISBN 978-83-88147-15-9.
  3. F. C. Whitmore, J. A. Kaltenbach. Neogene Cetacea of the Lee Creek Phosphate Mine, North Carolina. „Virginia Museum of Natural History special publication”. 14, s. 181-269, 2008 (ang.).
  4. Remington Kellogg. A new fossil toothed whale from Florida. „American Museum Novitates”. 389, s. 1-10, 1929 (ang.).
  5. Lawrence G. Barnes. Praekogia cedrosensis, a new genus and species of fossil pygmy sperm whale from Isla Cedros, Baja California, Mexico. „Contributions in science”. 247, s. 1-20, 1973 (ang.).
  6. Wilson Don E. & Reeder DeeAnn M. (red.) Physeteridae. w: Mammal Species of the World. A Taxonomic and Geographic Reference (Wyd. 3.) [on-line]. Johns Hopkins University Press, 2005. (ang.) [dostęp 2007-11-27]
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Kogiowate: Brief Summary ( Polish )

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Kogiowate, (Kogiidae) – rodzina ssaków z kladu zębowców (Odontoceti) w obrębie waleni (Cetacea). Kaszaloty małe są bliskimi krewnymi kaszalotowatych i tak jak one żywią się rybami i mięczakami głębin morskich. Żeby odstraszyć potencjalnych wrogów upodobniły się morfologicznie do rekinów imitując ich kształt głowy i szczelin skrzelowych.

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Kogiidae ( Portuguese )

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Kogiidae é uma família da subordem dos odontocetos composta por um só género (Kogia) que inclui apena duas espécies: o cachalote-anão (Kogia sima) e o cachalote-pigmeu (Kogia breviceps).

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Kogiidae ( Ukrainian )

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Kogiidae: Brief Summary ( Ukrainian )

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Nowak R.M. Walker's Marine Mammals of the World. — Baltimore & London : JHU Press, 2003. — С. 11. (англ.) Bianucci G., Landini W. (1999). Kogia pusilla from the middle Pliocene of Tuscany (Italy) and a phylogenetic analysis of the family Kogiidae (Odontoceti, Cetacea) // Rivista Italiana di Paleontologia e Stratigrafia (Research In Paleontology and Stratigraphy). — Vol. 105, No 3. — P. 445–453.


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Kogiidae ( Vietnamese )

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Kogiidae là một họ cá voi. Họ này được thành lập năm 1871.[1]

Phân loại học

Hình ảnh

Chú thích

  1. ^ a ă Wilson, D. E.; Reeder, D. M. biên tập (2005). “Kogiidae”. Mammal Species of the World . Baltimore: Nhà in Đại học Johns Hopkins, 2 tập (2.142 trang). ISBN 978-0-8018-8221-0. OCLC 62265494.

Tham khảo


Hình tượng sơ khai Bài viết liên quan đến Bộ Cá voi (Cetacea) này vẫn còn sơ khai. Bạn có thể giúp Wikipedia bằng cách mở rộng nội dung để bài được hoàn chỉnh hơn.
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Kogiidae: Brief Summary ( Vietnamese )

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Kogiidae là một họ cá voi. Họ này được thành lập năm 1871.

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Description

provided by World Register of Marine Species
The pygmy and dwarf sperm whales are much smaller than the sperm whale, and share only a slight resemblance to the great sperm whale. They have blunt, squarish heads, with underslung lower jaws (like their larger counterparts), but the head is much smaller than in the sperm whale, and the blowhole is not located at the front of the head as it is in the sperm whale. The skull structure is curious; it shares a basin-like facial area and great asymmetry with hte sperm whale, but is much shorter. The dorsal fin in both species is larger than that of the sperm whale. The biology of these animals is very poorly known.

Reference

MASDEA (1997).

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Edward Vanden Berghe [email]