A new, interstitial species of Terrestricythere (Crustacea: Ostracoda) and its microdistribution at Orito Beach, northeastern Sea of Japan
A new, interstitial species of Terrestricythere (Crustacea: Ostracoda) and its microdistribution at Orito Beach, northeastern Sea of Japan
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DOI：
10.1007/s10750-007-0627-4
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发表时间：
2007-07-01
期刊：
影响因子：
2.6
通讯作者：
Mawatari, Shunsuke F.
中科院分区：
文献类型：
--
作者：
Hiruta, Shimpei F.;Hiruta, Shin-ichi;Mawatari, Shunsuke F.
我们描述了在日本北海道南部松前的Orito海滩的沿海间质栖息地的陆地限制那里的proboscidis sp. 11 .，一个以粗糙的沙子和许多鹅卵石为特征的地点。这是介形虫超科Terrestricytheroidea的第5个已知种，是该超科的第一个间隙种，也是该超科在日本的第一个记录。这个新物种与它的四个已知同族明显不同，因为它的小甲壳有一个横向平坦的腹缘，第七肢由四个足部组成；它的半阴茎有一个长长的s形突起。我们还报道了新物种的栖息地、微分布和运动行为。定量采样表明该物种生活在间隙环境中。长鼻舌虱是泛盐性的。行为观察表明，T. proboscidis不会游泳，但用它的附属物在沉积物颗粒中推动自己。方差分析表明，温度和粒度、温度-深度和温度-粒度的相互作用对种群密度的变化有显著影响。沉积物含水量与这些变量相关，可能是影响该物种微分布的主要因素。
We describe Terrestricythere proboscidis sp. nov. from a littoral interstitial habitat at Orito Beach, Matsumae, southern Hokkaido, Japan, a site characterized by coarse sand with many pebbles. This is the fifth known species of the ostracod superfamily Terrestricytheroidea, the first interstitial species of the superfamily, and the first record of the superfamily from Japan. The new species is clearly distinguished from its four known congeners by its small carapace with a transversely flat ventral margin, and the seventh limb consisting of four podomeres; its hemipenis has a long, S-curved process. We also report here the habitat, microdistribution, and locomotory behavior of the new species. Quantitative sampling revealed that the species lives in an interstitial environment. T. proboscidis is euryhaline. Behavioral observations showed that T. proboscidis cannot swim, but uses its appendages to push itself among sediment grains. An analysis of variance showed temperature and grain size, as well as temperature-depth and temperature-grain size interactions, to be significant influences on variation in population density. Sediment moisture content is correlated with these variables and likely is a primary factor in this species' microdistribution.