The identity of protopodal segments and the ramus of maxilla 2 of copepods (copepoda)
The identity of protopodal segments and the ramus of maxilla 2 of copepods (copepoda)
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DOI：
10.1163/156854008784771702
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发表时间：
2008-01-01
期刊：
影响因子：
0.6
通讯作者：
Ivanenko, Viatcheslav N.
中科院分区：
文献类型：
--
作者：
Ferrari, Frank D.;Ivanenko, Viatcheslav N.
桡足类上颌骨2的原足由近端合骨和近端合骨和远端合骨组成。底部有两个末端，分枝是一个内足类，最多有五个节段。这种解释是基于肢体与身体关节处的原节点模式，以及假设这种模式应该导致在序列相同的肢体上颌骨1前部和上颌骨后部的原足部上形成可派生的内侧构型。影响桡足类上颌骨2的形态多样性的过程包括：截断原节节段、抑制末端延伸、截断足节内节段和节段伸长。关于碱基转换的假说认为：碱基的两端都不会在上颌骨2上变薄，管嘴纲上颌骨2的基底部是腹拉长的。
The protopod of the maxilla 2 of copepods is composed of a proximal syncoxa with a praecoxal endite proximally and a coxal endite distally. The basis bears two endites, and the ramus is an endopod bearing up to five segments. This interpretation is based on protopodal patterning from the point where the limb articulates with the body, and the assumption that this patterning should result in a derivable enditic configuration on the protopod of the serially homologous limbs maxilla 1 anteriorly and maxilliped posteriorly. Processes that affect the morphological diversity of maxilla 2 among copepods include: truncation of protopodal segmentation, suppression of enditic extension, truncation of endopodal segmentation, and segment elongation. Hypotheses about transformations of the basis suggest the following synapomorphies: neither endite of the basis is attenuate on maxilla 2 of Poecilostomatoida; the basis of maxilla 2 of Siphonostomatoida is elongate ventrally.