查询词典 trilobites

Trilobites developed one of the first advanced visual systems in the animal kingdom. The majority of trilobites bore a pair of compound eyes. They typically occupied the outer edges of the fixigena on either side of the glabella , adjacent to the facial sutures .

在动物王国中，三叶虫是第一类发展出视觉系统的动物，它们多半具有一对复眼，眼的位置通常位于活动颊和头甲的结合部位，接近于面部缝合线。

The development of schizochroal eyes in phacopid trilobites is a good example of post-displacement paedomorphosis. The eyes of immature holochroal Cambrian trilobites were basically miniature schizochroal eyes.

一个很好的关于裂膜眼发展的例子来自于Phacopid三叶虫的幼体发育的加快取代期，在处于这个阶段的该三叶虫的眼睛上，显示了一组寒武纪全膜眼三叶虫的形态。

Endless variations of trilobites, but no new classes such as trilobites.

三叶虫发展出无穷无尽的变化，但没有新如三叶虫的门类。

Compound eyes in living arthropods such as insects are very sensitive to motion , and it is likely that they were similarly important in predator detection in trilobites.

复眼在现生的节肢动物如昆虫中非常常见，这些复眼对运动的物体非常敏感，对于一些食肉的三叶虫来说这种相似的构造非常重要。

In the north area, there are mainly carbonate rocks and shallow sea facies fossil, such as Trilobites, cephalopodes, Brachiopodes and Anthozoans in fossil feature. In the south area, there are mainly flysch and deep sea facies fossil, such as Graptolites in fossil feature.

北区岩性为碳酸盐岩建造，生物以三叶虫、头足类、腕足类及珊瑚等浅海生物为主；南区岩性为复理石建造，生物以深海相笔石为主。

In some trilobites, such as the free-swimming pelagic trilobite Opipeuter, the eyes were so large that they dominated the cephalon, providing a 360 degree visual field. Specialized forms, such as Agnostus, seem to have been entirely blind.

一些三叶虫，如自由游泳的远洋三叶虫Opipeuter，有着很大的首头甲控制的眼睛，它有着360度的广阔视野。

At least one suborder of trilobites, the Agnostina , are thought to be primarily eyeless . None have ever been found with eyes. In contrast, a few secondarily eyeless species (in which a clear evolutionary trend toward reduced eye size with eventual disappearence of eyes altogether) have developed within several groups, even those known for large, well-developed eyes ( e.g., Phacopina).

在最少一个亚目的三叶虫 Agnostina 中，通常是盲目的，这类三叶虫从来没有发现过眼睛的构造，以此相对的，一些很少的其他亚盲目的种（一些进化了简单的眼睛的物种）是比较进化的，甚至是一些大个体的，有很好的眼睛发育的种，如 Phacopina。

Such evolutionary trends are repeatedly seen in a variety of trilobite orders, and two examples are shown below. In both cases, these are Devonian trilobites that started with ancestors bearing large, functional eyes. In one sequence, eyes of a Phacopid clade were lost, and facial sutures associated with eyes were also reduced and marginalized.

如同进化的过程常常重复在不同的三叶虫系统中，有两个例子列举如下：在两个方面，泥盆纪三叶虫继承了祖先复杂的眼睛，在一个次序上，眼睛在Phacopid的进化枝上丢失，面部缝合线趋向紧密所以眼睛变得小和受到排斥。

However, the deep-water facies trilobites of the relevant Chinese biogeographic units had progressively become more unified from the middle Darriwilian to the early Katian before the sub-provinces eventually broke down by the late Katian.

饶有趣味的是在凯迪晚期或阿石极期开始发生的生物地理亚区解体之前，有关陆块的深水相三叶虫动物群已经历了从达瑞威尔中期至凯迪早期的长期频繁交流以及组成逐渐趋于齐一的过程。

The Lower Cambrian Balang Fauna from the upper part of Balang Formation of both Kaili City and Jiangku, Zhenyuan consists of six phyla, includes trilobites, bradoriida and large bivalved arthropods of arthropods, coelenterates, brachiopods, mollusks, eocrinoids and algae, a large variety of ichnofossils.

新近发现的杷榔动物群产于贵州东部凯里市西郊和镇远县江古镇早寒武世都匀期晚期杷榔组上部，由6个大门类化石组成，包括了腔肠动物、蠕形动物、腕足动物、棘皮动物、软体动物、节肢动物及大量遗迹和藻类化石。

Finally, the Knight strung a line between two of the monoliths and tied the horses up there.

最后，骑士们在两颗巨石之间拉了一条绳子，将他们的座骑绑在上面。

T7zN/hyS0 The island lies south by east from here.

那个岛位于此地的正南偏东方向。