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 Posmkāji
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ID number:895608
 
Author:
Evaluation:
Published: 27.12.2011.
Language: Latvian
Level: Elementary school
Literature: n/a
References: Not used
Extract

Posmkāji
Posmkāju klasē ietilpst:
Trilobīti – Visas sugas izmirušas
Vēži – Platspīļu, šaurspīļu
Helicerāti – Zobenastes, vēžskorpioni un zirnekļi
Traheāti – Daudzkāji, kukaiņi.

Trilobīti
Trilobītveidīgo apakšklasē ir tikai viena klase — trilobīti. Trilobitiem ir vairāk, kā 150 dzimtu un virs 15000 sugu.

Helicerāti
Helicerāti ir plašs un daudzveidīgs posmkāju apakštips. Tajā ir sīki līdz vidēji lieli posmkāji. Lielākā helicerātu klase ir zirnekļveidīgie, kas ir sastopami dažādos sauszemes biotopos vai retāk ūdenī.…

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