Minute protrusions of the cuticle: Fine surface structures of the tunic in ascidians
Minute protrusions of the cuticle: Fine surface structures of the tunic in ascidians
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角质层的微小突起：海鞘外衣的精细表面结构
DOI：
10.1002/jmor.1052040108
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发表时间：
1990
影响因子：
1.5
通讯作者：
K. Hashimoto
中科院分区：
文献类型：
--
作者：
E. Hirose;Yasunori Saito;Hiroshi Watanabe;K. Hashimoto
采用扫描电镜和透射电镜对9科25种海鞘的表皮表面精细结构进行了研究。角质层表面装饰有许多微小的突起在某些种类，但在其他种类没有。微小的突起通常呈乳突状，高度小于~ 0.05 μm（在多刺蝇科和多刺蝇科的一些物种中），或高度小于~ 0.1 μm（在所有的Botryllidae物种，所有柱头科的殖民地物种和一个单独的Pyuridae物种中）。在小叶蝉（多叶蝉科）中，被囊具有平行的脊状突起，脊状突起在其表面分布。Halocynthia roretzi （Pyuridae）的微小突起形状不规则，看起来像铺路石。在针蝇科、针蝇科、刺蝇科和海鞘科中没有发现突起，在针蝇科的一个单独物种中也没有发现突起。至少在一些群落物种中，微小突起的密度在群落边缘比在其他地方要低。很有可能在被囊分泌后不久就发现微小的突出物，随着被囊变老，它们的大小和数量都变大。
The fine structure of the cuticular surface of the tunic was studied by scanning and transmission electron microscopy in 25 species belonging to 9 families of ascidians. The cuticular surface is ornamented with numerous minute protrusions in some species, but not in others. The minute protrusions are usually papillate in shape, and less than ∼0.05 μm high (in some species of the families Polyclinidae and Polycitoridae), or ∼0.1 μm high (in all species of Botryllidae, all colonial species of Styelidae and one solitary species of Pyuridae). In Clavelina miniata (Polycitoridae), the tunic is provided with parallel ridges on the surface of which papillate protrusions are distributed. The minute protrusions of Halocynthia roretzi (Pyuridae) are irregularly shaped, giving an appearance of paving stones. No protrusions are found in the families Didemnidae, Cionidae, Perophoridae, and Ascidiidae, and in one solitary species of Styelidae. At least in some colonial species, the density of the minute protrusions is lower at the edge of the colony than elsewhere. It is very probable that minute protrusions are found shortly after the secretion of tunic, growing larger both in size and in number as the tunic becomes older.