두족류

두족강
1904년 에른스트 헤켈의 자연의 예술적 형상들에서의 두족류
1904년 에른스트 헤켈자연의 예술적 형상들에서의 두족류
생물 분류ℹ️
계: 동물계
문: 연체동물문
강: 두족강
(Cephalopoda)
아강

두족류(頭足類, 영어: cephalopod)는 두족강(頭足綱)에 속하는 연체동물의 총칭으로, 좌우대칭형이며 몸통이 머리의 위에 붙어있고 머리의 밑에 바로 다리가 존재하는 것을 공통적인 특징으로 하는 동물들을 부류한 것이다. 현재 약 1,000종에서 1,200종 사이가 현존하는 것으로 알려져 있다.

현존하는 두족류는 아가미가 한 쌍인 갑오징어, 살오징어낙지, 주꾸미, 문어 등의 생물과, 아가미가 두 쌍인 앵무조개류로 크게 나뉘며, 이에 속하지 않는 두족류도 일부 있다. 과거에 존재했던 두족류 중 유명한 것은 고생대에 존재했던 암모나이트벨렘나이트 등이 있다. 고생대 초기인 캄브리아기에 나타나서 오르도비스기, 석탄기페름기 때 번성했지만, 현재는 쇠퇴해 가는 것으로 추측된다. 껍데기(또는 패각)를 가진것도 있고 없는 것도 있으며 5cm에서 16m까지 크기도 다양하다.

분류

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