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ID number:614794
 
Author:
Evaluation:
Published: 22.03.2008.
Language: Latvian
Level: Elementary school
Literature: n/a
References: Not used
Extract

Lancetnieki (Leptocardii) ir galvhordaiņu apakštipa klase.
Jūru iemītnieki
Ķermenis sāniski nedaudz saplacināts, caurspīdīgs; 5-7 cm garš
Horda saglabājas visu dzīves laiku un to aptver balstaudu apvalks
Muskuļi sastāv no miomēriem
Nervu sistēma - primitīva, bet ir galvas smadzeņu vēderiņs
Maņu orgāni – vienkārši: Heses actiņas un atsevišķas jūtīgas šūnas; acu un dzirdes orgānu nav
Gremošanas sistēma –sākas ar mutes piltuvi ar taustekļu vainagu, rīklē vairāk nekā 100 žaunu atveru…

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