Moult-related changes in ampullate silk gland morphology and usage in the araneid spider Araneus cavaticus.
Moult-related changes in ampullate silk gland morphology and usage in the araneid spider Araneus cavaticus.
复制标题
腹腔蜘蛛壶腹丝腺形态和用途的换毛相关变化。
DOI：
10.1098/rstb.1993.0046
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发表时间：
1993
期刊：
影响因子：
--
通讯作者：
Cherim,NA
中科院分区：
文献类型：
--
作者：
Townley,MA;Tillinghast,EK;Cherim,NA
采用解剖方法，对3 ~ 2龄空斑蝶幼蛛的大壶腹腺（MaA）和小壶腹腺（MiA）进行了解剖。蜕皮前几天，较大的MaA和MiA腺体失去功能，直到蜕皮。然而，由于存在较小的MaA和MiA腺体对，在这个时候它们是有功能的，所以前卵蜘蛛能够拉壶腹纤维。事实上，这些较小的壶腹腺似乎只在前裂过程中使用。因此，较大的MaA和MiA腺体和较小的MaA和MiA腺体通常不会同时使用（短暂的过渡时期是例外）。在一个幼体中起作用的较小壶状腺在下一个幼体中退化，并成为（以前被称为）附属MaA和MiA腺体。这些无功能的附属壶腹腺直到以下体育场才重新发育成功能较小的壶腹腺。因此，一对较小的MaA或MiA腺体只在每一个其他的青少年体育场中起作用。然而，由于有两组较小的/附属的MaA和MiA腺体交替作用，蜘蛛能够在每个体育场的前蜕皮部分产生壶腹纤维。提出了一种新的壶形腺、小壶形腺和副壶形腺的术语，强调了两组小壶形腺/副壶形腺之间的亲缘关系。
Major ampullate (MaA) and minor ampullate (MiA) silk glands of juvenileAraneus cavaticus(third to penultimate instars) were examined by dissection at various times relative to ecdysis. Several days before ecdysis the larger pairs of MaA and MiA glands become non-functional and remain so until ecdysis. Nevertheless, proecdysial spiders are able to draw ampullate fibres due to the presence of smaller pairs of MaA and MiA glands which are functional at this time. Indeed, it appears that these smaller ampullate glands are intended for use only during proecdysis. Thus, larger MaA and MiA glands and smaller MaA and MiA glands are typically not used concurrently (a brief transitional period is an exception). The smaller ampullate glands functioning in one juvenile stadium regress in the following stadium and become (what have previously been referred to as) accessory MaA and MiA glands. These nonfunctional accessory ampullate glands do not re-develop into functional smaller ampullate glands until the following stadium. Thus, a given pair of smaller MaA or MiA glands is only functional in every other juvenile stadium. However, because there are two sets of smaller/accessory MaA and MiA glands which function alternately, the spider is able to produce ampullate fibres during the proecdysial portion of each stadium. A new terminology for the larger, smaller and accessory ampullate glands is proposed which emphasizes the kinship between the two sets of smaller/accessory ampullate glands.