DEVELOPMENTAL ANALYSIS OF SCYPHOMEDUSAE
DEVELOPMENTAL ANALYSIS OF SCYPHOMEDUSAE
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DOI：
10.1111/j.1469-185x.1949.tb00581.x
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发表时间：
1949-01-01
影响因子：
10
通讯作者：
BERRILL, NJ
中科院分区：
文献类型：
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作者：
BERRILL, NJ
青鱼卵的直径各不相同。0.03毫米至0.3毫米。原肠胚小的为单极内陷，最大的为内陷，两者之间为混合型。当原肠全部或部分由内陷形成时，扁平细胞就会发育。当内陷时，直接发育形成水母细胞。扁平线虫产生弓形吸虫，后者又产生侧芽或基芽，最后通过鳞片转移到叶脉中。根据形状和大小的不同，突起可以是单盘或多盘。
Scyphomedusan eggs vary in diam. from 0.03 to 0.3 mm. Gastrulation is by unipolar ingression in the smaller, by invagination in the largest, and of a mixed type in between. Planulae develop when gastrulation is wholly or partly by ingression. Direct development to form medusae occurs when it is by invagination. Planulae give rise to scyphistomae, which in turn produce lateral or basal buds in addition to eventual transfer into ephyrae by strobilation. Strobilation may be monodisc or polydisc, depending on shape and size.