Evolutionary Morphology of the Organ Systems in Squat Lobsters and Porcelain crabs (Crustacea: Decapoda: Anomala): An Insight into Carcinization
Evolutionary Morphology of the Organ Systems in Squat Lobsters and Porcelain crabs (Crustacea: Decapoda: Anomala): An Insight into Carcinization
复制标题
DOI：
10.1002/jmor.20311
复制
发表时间：
2015-01-01
影响因子：
1.5
通讯作者：
Wirkner, Christian S.
中科院分区：
文献类型：
--
作者：
Keiler, Jonas;Richter, Stefan;Wirkner, Christian S.
瓷蟹（Porcelaincrafts）是异尾纲甲壳动物（Anomala）中的三个分类群之一，具有螃蟹般的身体形式。奇怪的是，这三个谱系在称为癌化的进化过程中独立于真蟹（短尾蟹）进化出这种形状。在瓷蟹的整个pleon是弯曲的在头胸部和甲壳是大约一样宽一样长。尽管它们的习性像螃蟹，瓷蟹是寄生在蹲龙虾（Munidopsidae，Munidididae，Galatheidae）内的。由于在头胸部下只有部分弯曲的pleon和比它宽的头胸部，蹲龙虾代表了龙虾状和螃蟹状身体形状之间的形态学中间形式。到目前为止，癌变主要是关于外部形态学的研究;然而，很明显，内部解剖特征也会受到体型变化的影响。在本文中，在Galatheoidea的情况下，通过添加更多的分类群来阐明现有的描述的血淋巴血管系统和相关的结构和器官。微型计算机断层扫描和3D重建提供了新的见解。各种内部解剖特征的自形状态存在于几乎所有的研究物种中，也反映了在Galatheoidea内发现的某种程度的解剖差异。瓷蟹的腹侧血管系统与龙虾的腹侧血管系统有明显的不同。所讨论的差异是一致的（即结构依赖）与形态学的转变，在珠被，如缩短胸骨的腹，这在癌变过程中演变。性腺和pleonal neuromeres的变化与caridoid逃逸反应的丧失是一致的，这反过来又是致癌的结果。然而，与其他在无尾纲甲壳类动物中发生的癌变相比，动脉的转变是次要的，因为深蹲龙虾和瓷蟹的最后共同祖先已经发生了一半的癌变。J. Morphol. 276：1-21，2015. (c)2014 Wiley Periodicals，Inc.
Porcelain crabs (Porcellanidae) are one of three taxa within anomuran crustaceans (Anomala) which possess a crab-like body form. Curiously, these three lineages evolved this shape independently from true crabs (Brachyura) in the course of the evolutionary process termed carcinization. The entire pleon in porcelain crabs is flexed under the cephalothorax and the carapace is approximately as broad as long. Despite their crab-like habitus, porcelain crabs are phylogenetically nested within squat lobsters (Munidopsidae, Munididae, Galatheidae). With a pleon which is only partly flexed under the cephalothorax and a cephalothorax which is longer than it is broad, squat lobsters represent morphologically intermediate forms between lobster-like and crab-like body shapes. Carcinization has so far mostly been studied with respect to outer morphology; however, it is evident that internal anatomical features are influenced through this change of body shape too. In this paper, the situation in Galatheoidea is elucidated by adding more taxa to existing descriptions of the hemolymph vascular systems and associated structures and organs. Micro-computer tomography and 3D reconstruction provide new insights. Autapomorphic states of various internal anatomical characters are present in nearly all the studied species, also reflecting some degree of anatomical disparity found within Galatheoidea. The ventral vessel system of porcelain crabs differs distinctly from that of squat lobsters. The differences in question are coherent (i.e. structural dependent) with morphological transformations in the integument, such as the shortening of the sternal plastron, which evolved in the course of carcinization. Shifts in the gonads and the pleonal neuromeres are coherent with the loss of the caridoid escape reaction, which in turn is a consequence of carcinization. The arterial transformations, however, are minor compared to other instances of carcinization in anomuran crustaceans since the last common ancestor of squat lobsters and porcelain crabs was already half carcinized. J. Morphol. 276:1-21, 2015. (c) 2014 Wiley Periodicals, Inc.