Share to: share facebook share twitter share wa share telegram print page

Spendýr

Spendýr
Tímabil steingervinga: Síðtríastímabilið – nútími
Maasaigíraffi (Giraffa camelopardalis)
Vísindaleg flokkun
Ríki: Dýraríki (Animalia)
Fylking: Seildýr (Chordata)
Undirfylking: Hryggdýr (Vertabrata)
Flokkur: Spendýr (Mammalia)
Linnaeus (1758)
Ættbálkar

Spendýr (fræðiheiti: Mammalia) eru flokkur seildýra í undirfylkingu hryggdýra sem einkennist af því að vera með mjólkurkirtla, sem kvendýrin nota til að framleiða mjólk til að næra ungviði; feld eða hár og innverminn líkama (heitt blóð). Heilinn stýrir blóðrásarkerfinu, þar á meðal hjarta með fjögur hólf. Um 5.500 tegundir spendýra eru þekktar og skiptast þær í um 1.200 ættkvíslir, 152 ættir og 26 ættbálka.[1]

Eiginleikar

Flest spendýr fæða lifandi afkvæmi, en tegundir af undirflokki nefdýra verpa eggjum. Þó svo væri ekki væri þessi eiginleiki ekki einkennandi fyrir flokkinn því ýmis önnur hryggdýr, eins og t.d. gúbbífiskar og sleggjuháfar, fæða einnig lifandi afkvæmi.

Kvendýr af flokki spendýra eru öll með mjólkurkirtla en ekki öll með spena (eða geirvörtur).[2] Aftur hefur nefdýraundirflokkurinn þar sérstöðu en kvendýr af þeim flokki eru með holur á kviðnum sem mjólkin seitlar út um í stað spena.

Heilar allra spendýra eru með nýbörk, en hann er einkennandi fyrir flokkinn.

Flest spendýr eru landdýr, en sum þ.á m. sækýr og hvalir, lifa í vatni.

Tilvísanir

  1. ↑ „Hvað eru til margar tegundir af spendýrum í heiminum?“. Vísindavefurinn.
  2. ↑ „Hvað er það helsta sem einkennir spendýrin?“. Vísindavefurinn.

Tenglar

Wikiorðabókin er með skilgreiningu á orðinu Spendýr.
  Þessi líffræðigrein er stubbur. Þú getur hjálpað til með því að bæta við greinina.

Read other articles:

Tantric sex

Tantric sexual practices Jambhala (Kubera) deity in Tibet (18th–19th century) Tantric sex or sexual yoga refers to a range of practices in Hindu and Buddhist tantra that utilize sexuality in a ritual or yogic context. Tantric sex is associated with antinomian or elements such as the consumption of alcohol, and the offerings of substances like meat to deities. Moreover, sexual fluids may be viewed as power substances and used for ritual purposes, either externally or internally.[1]&#...

 

Élections sénatoriales de 2014 en Tarn-et-Garonne

2004 2020 Élections sénatoriales de 2014 en Tarn-et-Garonne 28 septembre 2014 Type d’élection Élections sénatoriales Postes à élire 2 sièges de sénateur Yvon Collin – DVG Voix 404 55,96 %  François Bonhomme – UMP Voix 317 43,91 %  Voix au 2e tour 363 50,84 %  Jean-Michel Baylet – PRG Voix 270 37,40 %  Voix au 2e tour 295 41,32 %  Francis Labruyère – PRG Voix 183 25,35 %  Séna...

 

ميرميران (رتبة عثمانية)

أمير الأمراء نورس باشا الهاشمي الحسيني الحراكي، الثاني من على يمين الصورة مع السيد محمد الحراكي الأول على يمين الصورة، مع كل من شيخ مشايخ الإمبراطورية الإسلامية في العهد العثماني وصدرها الأعظمالميرميران هي واحدة من أرفع الرُتب في الإمبراطورية الإسلامية العثمانية المعروف

Bosque de coníferas de la península ibérica

Bosque de coníferas de la península ibérica Ecozona: PaleárticaBioma: Bosque mediterráneoExtensión: 34.400 km2Estado de conservación: En peligro críticoPaíses España España Ecorregiones – WWF Mapa de Bosque de coníferas de la península ibérica [editar datos en Wikidata] El bosque de coníferas de la península ibérica es una ecorregión de la ecozona paleártica, definida por WWF, que se extiende por gran parte de la península ibérica, mayormente por las mont...

 

John II Komnenos

Byzantine emperor from 1118 to 1143 For other people named John Komnenos, see John Komnenos (disambiguation). John II KomnenosEmperor and Autocrat of the RomansMosaic of John II at the Hagia SophiaByzantine emperorReign15 August 1118 – 8 April 1143Coronation1092 as co-emperorPredecessorAlexios I KomnenosSuccessorManuel I KomnenosCo-emperorAlexios the YoungerBorn13 September 1087Constantinople, Byzantine Empire(now Istanbul, Turkey)Died8 April 1143(1143-04-08) (aged 55)Ci...

 

Elektrische auto in Nederland

Aantal geregistreerde hybride en elektrische voertuigen in Nederland van 2011 tot 2021.[1][2][3] De elektrische auto in Nederland wordt door de Nederlandse overheid gestimuleerd. Door fiscale maatregelen, subsidies en een verbeterde laadinfrastructuur is het beleid erop gericht op termijn in Nederland uitsluitend auto's te verkopen die emissievrij kunnen rijden.[4] Vanaf 2030 zullen er in Nederland volgens het regeerakkoord uit 2017 alleen nog emissieloze auto'...

كوم اللوفي

كوم اللوفي  -  قرية مصرية -  تقسيم إداري البلد  مصر المحافظة محافظة المنيا المركز سمالوط المسؤولون إحداثيات 28°15′30″N 30°42′15″E / 28.258339°N 30.70427°E / 28.258339; 30.70427  السكان التعداد السكاني 7147 نسمة (إحصاء 2006) معلومات أخرى التوقيت ت ع م+02:00  تعديل مصدري - تعدي�...

 

Audi

AudiJenisPublikIndustriOtomotifDidirikanZwickau, Jerman (16 Juli 1909)[1]PendiriAugust HorchKantorpusatKantor pusat: Ingolstadt, Bavaria, Jerman.Lokasi produksi:Jerman:Ingolstadt & NeckarsulmHungaria: GyőrBelgia: BrusselsChina: ChangchunIndia: AurangabadBrasil: CuritibaTokohkunciRupert StadlerChairman of the Board of Management,Wolfgang EggerKepala DesainProduksi1.343.195 unit (2011) (hanya merek Audi)Pendapatan €44,096 miliar Euro (2011) [2]Laba bersih €5,3 miliar Eu...

 

Questprobe

1984 video gameQuestprobeSeries logoDeveloper(s)Adventure InternationalPublisher(s)Adventure InternationalDesigner(s)Scott AdamsProgrammer(s)Scott AdamsPlatform(s)Apple II, Atari 8-bit, Commodore 64, DOS, Acorn Electron, ZX Spectrum, MSX, TRS-80 CoCoRelease1984, 1985Genre(s)Text adventureMode(s)Single-player Questprobe is a trilogy of graphical adventure video games featuring Marvel Comics characters. The three games are Questprobe featuring The Hulk, Questprobe featuring Spider-Man and Quest...

Méhtelek

Place in Szabolcs-Szatmár-Bereg, HungaryMéhtelekCountry HungaryCountySzabolcs-Szatmár-BeregArea • Total8.62 km2 (3.33 sq mi)Population (2015) • Total759[1] • Density87.9/km2 (228/sq mi)Time zoneUTC+1 (CET) • Summer (DST)UTC+2 (CEST)Postal code4975Area code44 Location of Szabolcs-Szatmar-Bereg county in Hungary Méhtelek is a village in Szabolcs-Szatmár-Bereg county, in the Northern Great Plain region of ...

 

Chaos League

2004 video gameChaos LeaguePAL boxart of Chaos LeagueDeveloper(s)CyanidePublisher(s)UK: Digital JestersEU: Focus Home InteractivePlatform(s)Microsoft WindowsReleaseEU: 8 August 2004NA: 8 March 2005Genre(s)Sports, management, real-time strategyMode(s)Single-player, multiplayer Chaos League is a fantasy-based sports management game developed by Cyanide Studios and published by Digital Jesters. It was released in Europe on 8 August 2004 and later in North America on 8 March 2005. The game is a s...

 

Central Asians in ancient Indian literature

This article has multiple issues. Please help improve it or discuss these issues on the talk page. (Learn how and when to remove these template messages) This article may require cleanup to meet Wikipedia's quality standards. No cleanup reason has been specified. Please help improve this article if you can. (July 2010) (Learn how and when to remove this template message) This article needs additional citations for verification. Please help improve this article by adding citations to reliable ...

King Fahd International Airport

Largest airport in the world by area King Fahd International Airportمطار الملك فهد الدوليIATA: DMMICAO: OEDFSummaryAirport typePublicOwnerGACAOperatorDammam Airports CompanyServesDammam, Eastern Province, Saudi ArabiaLocationNorthwestern portion of Dammam Governorate; 31 km (19 mi) northwest of downtown DammamOpened28 November 1999; 24 years ago (1999-11-28)Hub for Flynas[1] Flyadeal Aramco Aviation (Mukamalah) Elevation AMSL72 ft / 22...

 

Menara Sopo Del

Artikel ini sebatang kara, artinya tidak ada artikel lain yang memiliki pranala balik ke halaman ini.Bantulah menambah pranala ke artikel ini dari artikel yang berhubungan atau coba peralatan pencari pranala.Tag ini diberikan pada Oktober 2022. Menara Sopo DelInformasi umumJenisTerpaduLokasiJakarta, IndonesiaKoordinat06°13′49″S 106°49′26″E / 6.23028°S 106.82389°E / -6.23028; 106.82389Mulai dibangun2014Rampung2018TinggiArsitektural170 m (560 ft)Dat...

 

Dracula vampira

Species of orchid Dracula vampira Conservation status CITES Appendix II (CITES) [1] Scientific classification Kingdom: Plantae Clade: Tracheophytes Clade: Angiosperms Clade: Monocots Order: Asparagales Family: Orchidaceae Subfamily: Epidendroideae Genus: Dracula Species: D. vampira Binomial name Dracula vampira(Luer) Luer Synonyms Masdevallia vampira Luer Dracula vampira is an epiphytic orchid species, endemic to Ecuador.[2] Description A Dracula vampira orchid ...

Star Wars: The Roleplaying Game

Tabletop space opera role-playing game For other types of Star Wars role-playing game, see Star Wars role-playing games. Star WarsThe Roleplaying GameCover based on the original movie poster by Tom Cantrell, 1977.DesignersGreg CostikyanPublishersWest End GamesFantasy Flight GamesPublication1987 1st edition1992 2nd edition1996 2nd edition Revised and Expanded2018 30th Anniversary editionGenresSpace opera[1]SystemsD6 SystemThe core system is based on that of WEG's Ghostbusters RPG. Star...

 

Ni no Kuni II: Revenant Kingdom

2018 video gameNi no Kuni II: Revenant KingdomDeveloper(s)Level-5Publisher(s)Bandai Namco EntertainmentJP: Level-5Director(s)Yoshiaki KusudaTakafumi KoukamiDesigner(s)Kengo ShibataYuichi MuraseProgrammer(s)Yasuhiro AkasakaYusuke HashimotoRyosuke NakaharaArtist(s)Nobuyuki YanaiHiroshi MatsuyamaHiroyuki MaedaWriter(s)Akihiro HinoComposer(s)Joe HisaishiSeriesNi no KuniPlatform(s)PlayStation 4WindowsNintendo SwitchXbox OneXbox Series X/SReleasePS4, WindowsMarch 23, 2018Nintendo SwitchSeptember 17...

 

Grabowiec (powiat hajnowski)

Ten artykuł dotyczy wsi Grabowiec. Zobacz też: Grabowiec. Artykuł 52°38′19″N 23°24′43″E - błąd 38 m WD 52°42'N, 23°23'E - błąd 20350 m Odległość 710 m Grabowiec wieś Państwo  Polska Województwo  podlaskie Powiat hajnowski Gmina Dubicze Cerkiewne Liczba ludności (2011) 275[1][2] Strefa numeracyjna 85 Kod pocztowy 17-204[3] Tablice rejestracyjne BHA SIMC 0027950[4] Położenie na mapie gminy Dubicze CerkiewneGrabowiec Położenie na mapie PolskiG...

Carol Zhao

Carol Zhao Carol Zhao nel 2023 Nazionalità  Canada Altezza 168 cm Tennis Carriera Singolare1 Vittorie/sconfitte 238 - 212 (52.89%) Titoli vinti 0 WTA, 4 ITF Miglior ranking 131º (25 giugno 2018) Ranking attuale ranking Risultati nei tornei del Grande Slam  Australian Open Q2 (2023)  Roland Garros Q3 (2021)  Wimbledon 1T (2023)  US Open Q1 (2018, 2022) Doppio1 Vittorie/sconfitte 94 - 89 (51.37%) Titoli vinti 0 WTA, 7 ITF Miglior ranking 157º (18 luglio 2016) Ranking...

 

أغريباس الثاني

الملك أغريباس الثاني ملك الجليل وبيرية الملك هيرودس أغريباس الثاني فترة الحكم 44 إلى 93. الملك أغريباس الأول.   معلومات شخصية الميلاد 28.روما  الوفاة سنة 100 (72–73 سنة)[1]  روما  مكان الدفن يهودية  مواطنة روما القديمة  الأب الملك أغريباس الأول. الأم غير معروف إ...

 
Kembali kehalaman sebelumnya