两种主要类型的眼睛是面向前方的主眼,称为ocelli和次要眼睛。在其他节肢动物中,ocelli仅检测光的方向,但在蜘蛛中,这些眼睛形成真实的图像。主要眼睛包含移动视网膜以聚焦和跟踪图像的肌肉。大多数蜘蛛的视力都很差,但是跳跃的蜘蛛中的ocelli超过了蜻蜓(具有最佳视力的昆虫)并接近人类的蜘蛛。由于它们的位置,ocelli也被称为前媒体眼睛或AME。次要眼睛来自复眼,但它们没有刻面。它们通常比主眼小。这些眼睛缺乏肌肉,完全不动。大多数次要眼睛是圆形的,但有些是椭圆形或半月形。根据位置识别眼睛。前外侧眼(ALE)是头部侧面的顶行眼睛。后外侧眼(PLE)是头部侧面的第二排眼睛。后中位眼(PME)位于头部中间。次要眼睛可能面向前方,或位于蜘蛛头部的侧面,顶部或背面。次要眼睛具有多种功能。在某些情况下,侧眼扩大了主眼的范围,使节肢动物成为广角图像。次要眼睛充当运动探测器并提供深度感知信息,帮助蜘蛛定位距离以及猎物或威胁的方向。在夜间物种中,眼睛有一个绒毡层,它反射光线并帮助蜘蛛在昏暗的光线下看到。带有绒毡层的蜘蛛在夜间照明时会显示出闪亮的光泽。

新西兰维多利亚大学生物学论文代写:节肢动物

The two main types of eyes are the front-facing main eye, called ocelli and secondary eyes. In other arthropods, ocelli only detects the direction of light, but in spiders, these eyes form a true image. The primary eye contains the muscles that move the retina to focus and track the image. Most spiders have poor eyesight, but the ocelli in the jumping spider exceeds the cockroach (the insect with the best vision) and is close to the human spider. Due to their location, ocelli is also known as the pre-media eye or AME. Secondary eyes come from compound eyes, but they have no facets. They are usually smaller than the main eye. These eyes lack muscle and are completely motionless. Most secondary eyes are round, but some are oval or half moon shaped. Identify the eye based on location. The anterior lateral eye (ALE) is the apical eye on the side of the head. The posterior lateral eye (PLE) is the second row of eyes on the side of the head. The posterior median eye (PME) is located in the middle of the head. The secondary eye may face forward, or be on the side, top or back of the spider’s head. Secondary eyes have multiple functions. In some cases, the lateral eye enlarges the range of the dominant eye, making the arthropod a wide-angle image. The secondary eye acts as a motion detector and provides depth perception information to help the spider locate the distance and the direction of the prey or threat. In nighttime species, the eye has a tapetum that reflects light and helps the spider see it in dim light. Spiders with tapetum show a shimmering glow when illuminated at night.

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