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单词 Sycettida
释义

Sycettida /si'setidə/

英汉-汉英词典
樽壶目
词组 | 习惯用语
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  • isostatic adj. 均衡说的
  • associated adj. 联合的,关联的
Sycettida n. [无脊椎] 樽壶目
英语百科

Calcaronea

(重定向自Sycettida)

Calcaronea is a subclass in the class Calcarea.They are Calcarea with the triactines and the basal system of tetractines sagittal (i.e. the rays of the spicule make unequal angles with each other), exceptionally regular. In ontogeny the first spicules to be secreted are diactines. Choanocytes are apinucleate. Calcaronea have amphiblastula larvae

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