Larval development of Japanese 'conchostracans': part 1, larval development of Eulimnadia braueriana (Crustacea, Branchiopoda, Spinicaudata, Limnadiidae) compared to that of other limnadiids
Larval development of Japanese 'conchostracans': part 1, larval development of Eulimnadia braueriana (Crustacea, Branchiopoda, Spinicaudata, Limnadiidae) compared to that of other limnadiids
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日本“壳甲纲”的幼虫发育：第 1 部分，Eulimnadia braueriana（甲壳纲、鳃足纲、刺尾目、Limnadiidae）幼虫发育与其他 limnadiids 的比较
DOI：
10.1046/j.1463-6395.2003.00129.x
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发表时间：
2002
期刊：
影响因子：
1.2
通讯作者：
M. Grygier
中科院分区：
文献类型：
--
作者：
J. Olesen;M. Grygier
作为对鳃足纲（甲壳纲）所有主要类群的幼虫或胚胎发育进行系统发育比较的项目的一部分，描述了 1895 年日本刺蛤虾 Eulimnadia braueriana Ishikawa 的幼虫发育。主要基于它们之间显着的形态差异，但在一种情况下，仅基于大小，识别了七个无节幼体阶段。七个阶段的长度范围为 156 µm 至 760 µm。无节幼体 1 不摄食，摄食结构发育不完全且无功能。无节幼体2号具有明显的功能性摄食结构，包括发育良好的下颌颌基、触角的有小毛的原足尾端，以及参与游泳和食物处理的各种刚毛上的小毛。无节幼体 3 在形态上与无节幼体 2 相同，但大 50% 以上。在无节幼体 4 中，触角的基端尾端（无节幼体过程）发育出一个分叉的尖端。无节幼体5号外侧有一对原始背甲裂片，前4～5对躯干肢芽发育较弱，使躯干前部宽于后部。无节幼体 6 中，外部可见 5 对躯干肢芽，并出现小甲壳，大约延伸至躯干肢 2；此外，前阶段下颌骨后面的一对大芽已分为一个大的前刚毛芽和两个较小的后芽。这些结构是副颌还是上颌骨/上颌骨的身份仍然不确定。在7号无节幼体中，外部可见约六对躯干肢芽。 E. braueriana 无节幼体的一般形态与著名的 Limnadia lentularis (Linnaeus, 1758) 和 Eulimnadia texana Packard, 1871 非常相似，包括细长的披针形唇部；然而，由于存在各种异时性，这些物种的幼虫序列之间的对应关系并不完美。与 1855 年报道的 Limnadia stanleyana King 以及该物种和 Jmnadia spp 的匙形拉布拉的 5 阶段幼虫发育的一致性甚至更少。与其他已知的 limnadiid 无节幼体不同。布氏桉的幼虫具有许多典型的（和同形的）鳃足类特征，例如参与摄食的附肢的一般形态和躯干肢体的发育方式，而第一触角的小芽和躯干肢体各部分的确切数量和发育是棘尾动物的典型特征。
As a part of a project to compare phylogenetically the larval or embryonic development of all major taxa of the Branchiopoda (Crustacea), the larval development of the Japanese spinicaudatan clam shrimp Eulimnadia braueriana Ishikawa, 1895, is described. Seven naupliar stages are recognized, based mainly on significant morphological differences between them, but in one case, on size alone. The seven stages range in length from 156 µm to 760 µm. Nauplius 1 is nonfeeding with incompletely developed and nonfunctional feeding structures. Nauplius 2 has apparently functional feeding structures, including a well-developed mandibular gnathobase, setulate protopodal endites of the antennae, and setules on various setae involved in swimming and food manipulation. Nauplius 3 is morphologically identical to Nauplius 2, but more than 50% larger. In nauplius 4, the coxal endite (naupliar process) of the antennae develops a bifid tip. Nauplius 5 has a lateral pair of primordial carapace lobes, and the first 4–5 pairs of trunk limb buds are weakly developed, making the anterior part of the trunk wider than the posterior. In nauplius 6, five pairs of trunk limb buds are visible externally and a small carapace has appeared, reaching approximately to trunk limbs 2; also, the pair of large buds behind the mandibles in previous stages has become divided into a large, anterior, setose bud and two smaller, posterior buds. The identities of these structures as either paragnaths or maxillules/maxillae remain uncertain. In nauplius 7, about six pairs of trunk limb buds are visible externally. The general morphology of the nauplius larvae of E. braueriana is much like those of the well-known Limnadia lenticularis (Linnaeus, 1758) and Eulimnadia texana Packard, 1871, including an elongate, lanceolate labrum; however, because of various heterochronies, the correspondence between the larval sequences of these species is not perfect. There is even less correspondence with the 5-stage larval development reported for Limnadia stanleyana King, 1855, and the spatulate labra of that species and Jmnadia spp. are different from those of other known limnadiid nauplii. The larvae of E. braueriana possess many typical (and synapomorphic) branchiopod features, such as the general morphology of the appendages involved in feeding and the mode of trunk limb development, while the small buds of the first antennae and the exact number and development of the parts of the trunk limbs are typical for the Spinicaudata.