Sucker formation in a bigfin reef squid: Comparison between arms and tentacles
Sucker formation in a bigfin reef squid: Comparison between arms and tentacles
复制标题
大鳍礁鱿鱼吸盘的形成：触手和触手的比较
DOI：
10.1002/jmor.21434
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发表时间：
2021
影响因子：
1.5
通讯作者：
Miura Toru
中科院分区：
文献类型：
--
作者：
Kimbara Ryosuke;Kohtsuka Hisanori;Abe Sou;Oguchi Kohei;Miura Toru
头足类动物已经获得了许多新奇的东西，并将它们的栖息地扩展到各种海洋环境中，成为高度敏捷的捕食者。在新奇的头足类动物中，多肢用于复杂的行为，包括捕获猎物。手臂上的吸盘是实现这些手臂功能的创新功能。此外，十足目动物（乌贼和墨鱼）的触手是专门用于捕获猎物的手臂，触手吸盘具有独特的形态。然而，关于吸盘形成的发育过程，我们所知甚少，这应该是触手和其他臂之间的区别。因此，本研究通过对大鳍礁鱿鱼第二臂和触角吸盘形成过程的观察和比较，揭示了形成独特吸盘形态的发育过程，特别是在触角上。胚胎发生过程中吸盘的形态学和组织学观察表明，在第二臂中，吸盘产生区出现在最末端。在产生吸盘的最近侧，通过内陷上皮组织分离出新的吸盘芽。在上臂近端，观察到具有功能结构的吸盘。在触手中，虽然吸盘的基本形成模式与第二臂相似，但吸盘的形成始于更早的胚胎阶段，吸盘的数量比第二臂急剧增加。此外，虽然在触手杆处（即触手最厚的部分）观察到四排吸盘，但我们的观察表明，两组两排吸盘被压缩成四排。因此，吸盘的形成过程在时间和空间上是不同的。此外,S。与先前描述的物种相比，lessoniana显示出保守而独特的吸盘形成模式，这表明吸盘形成模式在十足类谱系中是多样化的。
Cephalopods have acquired numerous novelties and expanded their habitats to various marine environments as highly agile predators. Among cephalopod novelties, multiple arms are used for complex behaviors, including prey capture. Suckers on arms are innovative features for realizing these arm functions. In addition, tentacles in Decapodiformes (squids and cuttlefishes) are arms specialized in prey capture and tentacular suckers show unique morphologies. However, little is known about the developmental process of sucker formation that should differ between tentacles and other arms. In this study, therefore, sucker formation processes on second arms and tentacles were observed and compared in a bigfin reef squid,Sepioteuthis lessoniana, to reveal the developmental processes forming the unique sucker morphologies, especially in tentacles. Morphological and histological observations of suckers during embryogenesis showed that, in second arms, the sucker‐producing area appeared at the most distal part. At the most proximal side of the sucker‐producing area, new sucker buds were isolated by invagination of the epithelial tissue. At the proximal arm parts, suckers with functional structures were observed. In tentacles, although the basic sucker formation pattern was similar to that in second arms, sucker formation started at earlier embryonic stages and the number of suckers was drastically increased compared to that in second arms. In addition, although four sucker rows were observed at the tentacular club, that is, the thickest part of a tentacle, our observations suggested that two sets of two sucker rows are compressed to form the four rows. Therefore, the sucker‐formation processes are temporally and spatially different between arms and tentacles. In addition,S.lessonianashows conserved and unique patterns of sucker formation in comparison with previously described species, suggesting that sucker formation patterns were diversified among Decapodiformes lineages.