Hamilton K A
Department of Biological Sciences and Marine Science Institute, University of California, Santa Barbara, California 93106.
J Morphol. 1983 Jun;176(3):351-364. doi: 10.1002/jmor.1051760308.
The arrangement and external morphology of the rodlike setae and associated structures located on the dactylopodites of the walking legs of six species of decapod crustaceans are compared. The dactyls of littoral species, represented by the rock crab, Cancer antennarius, and the spiny lobster, Panulirus interruptus, have dense tufts and bands of rodlike setae, as is typical of many decapods, and additionally only a few small plumed setae. The arrangement of setae on the dactyls of the recently discovered Galapagos vent crab, Bythograea thermydron, closely resembles that of C. antennarius. Rodlike and long plumed setae occur in about equal numbers on the dactyls of the pelagic anomuran, Pleuroncodes planipes. The dactyls having the fewest rodlike setae are those of the terrestrial hermit crab, Coenobita perlatus, and those of the kelp crab, Pugettia producta, where flat setae typical of Majidae have replaced most rodlike setae. The presence and structures of the terminal pores in rodlike setae vary intra- and interspecifically, possibly as a function of molt stage. Variations in some features of rodlike setae, such as tip acuity and presence of microsetae and surface sculpting, appear to be related to development. Serrated setae occur on the dactyls of megalopal P. producta but not in later stages. The topography and typology of setae located on the ambulatory dactyls of decapod crustaceans are considered in light of recent interest in using setal characteristics to determine the sensory functions of sensilla and to clarify the phylogeny of arthropod groups.
比较了六种十足目甲壳类动物步足指节上棒状刚毛及相关结构的排列和外部形态。以岩蟹（Cancer antennarius）和刺龙虾（Panulirus interruptus）为代表的沿岸物种的指节，有密集的棒状刚毛簇和带，这是许多十足目的典型特征，此外只有少数小的羽状刚毛。最近发现的加拉帕戈斯热液蟹（Bythograea thermydron）指节上刚毛的排列与岩蟹非常相似。远洋异尾类动物扁足侧腕蟹（Pleuroncodes planipes）的指节上，棒状刚毛和长羽状刚毛的数量大致相等。棒状刚毛最少的指节是陆生寄居蟹（Coenobita perlatus）和海带蟹（Pugettia producta）的，在海带蟹中，馒头蟹科典型的扁平刚毛取代了大多数棒状刚毛。棒状刚毛末端孔的存在和结构在种内和种间都有变化，可能与蜕皮阶段有关。棒状刚毛的一些特征变化，如尖端敏锐度、微刚毛的存在和表面雕刻，似乎与发育有关。锯齿状刚毛出现在海带蟹大眼幼体的指节上，但在后期阶段没有。鉴于最近人们对利用刚毛特征来确定感觉器的感觉功能和阐明节肢动物类群的系统发育感兴趣，本文考虑了十足目甲壳类动物步行指节上刚毛的地形学和类型学。
