Larval development of japanese “conchostracans”: Part 3, larval development of lynceus biformis (crustacea, branchiopoda, laevicaudata) based on scanning electron microscopy and fluorescence microscopy

Larval development of japanese “conchostracans”: Part 3, larval development of lynceus biformis (crustacea, branchiopoda, laevicaudata) based on scanning electron microscopy and fluorescence microscopy
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日本“壳甲纲”幼虫发育:第 3 部分,基于扫描电子显微镜和荧光显微镜的双形玳瑁(甲壳纲、鳃足纲、兔形目)幼虫发育

DOI:
10.1002/jmor.20101
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发表时间:
--
影响因子:
1.5
通讯作者:
Grygier MJ.
Grygier MJ.
中科院分区:
医学4区
文献类型:
--
作者:
Olesen J;Fritsch M;Grygier MJ.

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为了与短尾文昌鱼的重要幼虫进行比较,对另一种文昌鱼的幼虫序列进行了基本描述。已鉴定出四个幼虫阶段,大小从258到560μm不等。第一阶段没有扁平的背部屏蔽物,与随后的三个阶段形成对比,在这些阶段中存在这样的屏蔽物。在发育过程中,无节幼体附属物的唯一显著变化发生在从第一阶段到第二阶段的蜕皮时的触角上,内足增加了第四个顶端刚毛,用于食物处理的无节体突的形式从长的、不分枝的尖刺变成了两裂结构。此外,树干四肢(五对)的芽在第四阶段首先出现在外部,但在前一阶段可以通过角质层识别。L.幼虫序列和幼虫形态。生物格式与OFL的不同。短尾藻在已知的最早发育阶段有一个背盾,但在短尾藻的第一个发育阶段缺乏背盾。另一个区别是L。短尾龙有一个巨大的、扁平的、肾形的唇部,而Ofl。生物融合较小,在远端边缘有四根粗壮的、具小齿的刺。基于组外比较,L.至少在这些方面,Biformis很可能代表了祖先的形态。尽管山猫属幼虫具有部分特殊的形态,但它们与其他支脚类幼虫有许多相似之处,其中至少有两种,即无节幼体的游动/摄食装置和主干肢体的发育方式,可被认为是支脚类的突触同构体。J.Morphol,2013年。©2012 Wiley期刊,Inc.
For comparison with the remarkable larvae of the laevicaudatan (clam shrimp)Lynceus brachyurus, a basic description of the larval sequence of another laevicaudatan branchiopod, the JapaneseLynceus biformis, is provided. Four larval stages have been identified, ranging in size from 258 to 560 μm in length. The first stage has no flattened dorsal shield, in contrast to the three following stages, in which such a shield is present. During development, the only significant changes to the naupliar appendages occur in the antenna at the molt from stage 1 to 2, with the addition of a fourth apical seta to the endopod and a change in the form of the naupliar process, used for food manipulation, from a long, unbranched, pointed spine to a bifid structure. In addition, buds of trunk limbs (five pairs) first appear externally in stage 4 but can be recognized through the cuticle in the previous stage. The larval sequence and larval morphology ofL. biformisdiffer from those ofL. brachyurusin at least two respects.L. brachyurushas a dorsal shield in the earliest known stages, but such a shield is lacking in the first stage ofL. biformis.Another difference is thatL. brachyurushas a huge, flattened, kidney‐shaped labrum, whereas that ofL. biformisis smaller and bears four robust, denticulate spines on the distal margin. Based on out‐group comparison, the morphology ofL. biformis, at least in these respects, is likely to represent the ancestral morphology. Despite the partly peculiar morphology of the larvae ofLynceusspecies, they share many similarities with other branchiopod larvae, at least two of which, the naupliar swimming/feeding apparatus and the mode of development of the trunk limbs, could be considered synapomorphies for the Branchiopoda. J. Morphol., 2013. © 2012 Wiley Periodicals, Inc.
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DOI: 10.1046/j.1463-6395.2003.00129.x
发表时间: 2002
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DOI: 10.1387/ijdb.11804030
发表时间: 2001
期刊: The International journal of developmental biology
影响因子: --
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