Seitivalas

Seitivalas
Uhanalaisuusluokitus

Erittäin uhanalainen [1]

Erittäin uhanalainen

Tieteellinen luokittelu
Kunta: Eläinkunta Animalia
Pääjakso: Selkäjänteiset Chordata
Alajakso: Selkärankaiset Vertebrata
Luokka: Nisäkkäät Mammalia
Lahko: Valaat Cetacea
Alalahko: Hetulavalaat Mysticeti
Heimo: Uurteisvalaat Balaenopteridae
Suku: Balaenoptera
Laji: borealis
Kaksiosainen nimi

Balaenoptera borealis
Lesson, 1828

Seitivalaan levinneisyys
Seitivalaan levinneisyys
Katso myös

  Seitivalas Wikispeciesissä
  Seitivalas Commonsissa

Seitivalas eli uurteisvalas[2] (Balaenoptera borealis) on uurteisvalaiden heimoon kuuluva laji, jota tavataan kaikilla merialueilla. Toisin kuin sukulaisensa sillivalas, se välttelee lahtia ja pysyttelee avoimemmilla merialueilla. Seitivalas vaeltaa kesäksi viileille merialueille ja talveksi subtrooppisille merille.[3]

Laji on saanut nimensä seitin mukaan, sillä sitä tavataan Norjan edustalla samaan aikaan kuin suuria seitiparviakin.[4]

Lajin hetulat ovat mustat.[2]

Kanta

Seitivalaiden määrä on pienentynyt valaanpyynnin takia viidennekseen määrästä, mitä niitä oli ennen pyynnin aloittamista. Niitä on nykyisin jäljellä noin 54 000 yksilöä.[4]

Lähteet

  • Nuorteva, Pekka & Henttonen, Heikki: Eläimiä värikuvina: Nisäkkäät, matelijat, sammakkoeläimet, s. 113. Porvoo: WSOY, 1989. ISBN 951-0-13603-4

Viitteet

  1. ↑ Reilly, S.B., Bannister, J.L., Best, P.B., Brown, M., Brownell Jr., R.L., Butterworth, D.S., Clapham, P.J., Cooke, J., Donovan, G.P., Urbán, J. & Zerbini, A.N.: Balaenoptera borealis IUCN Red List of Threatened Species. Version 2014.2. 2008. International Union for Conservation of Nature, IUCN, Iucnredlist.org. Viitattu 1.8.2014. (englanniksi)
  2. ↑ a b Nuorteva, Pekka & Henttonen, Heikki, s. 113.
  3. ↑ Animal Diversity Web – ADW Balaenoptera borealis, sei whale University of Michigan, Museum of Zoology. Viitattu 29.10.2019. (englanniksi)
  4. ↑ a b Merinisäkäs akatemia – Seitivalas (Balaenoptera borealis) Särkänniemi. Viitattu 29.10.2019. (englanniksi)

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