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Kilbitud

Allikas: Vikipeedia

Anaspida
Fossiilide leiud: Vara-Silur - Hilis-Devon
Jamoytius kerwoodi

Jamoytius kerwoodi
Taksonoomia
Riik Loomad Animalia
Hõimkond Keelikloomad Chordata
Alamhõimkond Selgroogsed Vertebrata
Klass Kilbitud Anaspida

Kilbitud ehk anaspiidid (Anaspida) on väljasurnud rühm (klass) selgroogseid. Neid on traditsiooniliselt peetud silmuliste eellasteks.

Kilbitute rühma esindajad olid väikesed merelise eluviisiga lõuatud (Agnatha), kel puudusid soomused ja paarilised uimed. Kilbitute lõpused paiknesid reas mõlemal kehapoolel ning enamasti oli neid 6–15 paari.

Arvatavasti arenesid nad välja Vara-Siluris ning nende kõrgaeg kestis kuni Hilis-Devoni suure väljasuremislaineni, mille neist elasid üle üksnes silmulised.

Viited

Selles artiklis on kasutatud ingliskeelset artiklit en:Anaspida seisuga 18.07.2008.

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Kilbitud
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